feat(fixed-btns): add title for fixed buttons (#176)

9 files changed, 53 insertions, 29 deletions

diff --git a/assets/css/_partial/_fixed-button.scss b/assets/css/_partial/_fixed-button.scss
index 61bf372..b5ec515 100644
--- a/assets/css/_partial/_fixed-button.scss
+++ b/assets/css/_partial/_fixed-button.scss
@@ -1,11 +1,11 @@
+#fixed-buttons {
+  display: none;
+}
+
 .fixed-button {
   display: none;
-  overflow: hidden;
-  width: auto;
   z-index: 100;
   position: fixed;
-  top: auto;
-  left: auto;
   right: 1.5rem;
   font-size: 1rem;
   line-height: 1.3rem;
@@ -36,6 +36,7 @@
 }
 
 #top-button {
+  display: block;
   bottom: 1.5rem;
 }
 
diff --git a/assets/js/theme.min.js b/assets/js/theme.min.js
index 588dbc6..71cfe0d 100644
--- a/assets/js/theme.min.js
+++ b/assets/js/theme.min.js
@@ -1,3 +1,3 @@
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diff --git a/assets/js/theme.min.js.map b/assets/js/theme.min.js.map
index 1ee553f..5423e2c 100644
--- a/assets/js/theme.min.js.map
+++ b/assets/js/theme.min.js.map
@@ -1 +1 @@
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=> {\n    'use strict';\n\n    class Util {\n        forEach(elements, handler) {\n            elements = elements || [];\n            for (let i = 0; i < elements.length; i++) {\n                handler(elements[i]);\n            }\n        }\n\n        getScrollTop() {\n            return (document.documentElement && document.documentElement.scrollTop) || document.body.scrollTop;\n        }\n\n        isMobile() {\n            return window.matchMedia('only screen and (max-width: 680px)').matches;\n        }\n\n        isTocStatic() {\n            return window.matchMedia('only screen and (max-width: 960px)').matches;\n        }\n    }\n\n    class Theme {\n        constructor() {\n            this.util = new Util();\n            this.newScrollTop = this.util.getScrollTop();\n            this.oldScrollTop = this.newScrollTop;\n            this.scrollEventSet = new Set();\n            this.resizeEventSet = new Set();\n        }\n\n        initMenuMobile() {\n            const menuToggleMobile = document.getElementById('menu-toggle-mobile');\n            const menuMobile = document.getElementById('menu-mobile');\n            this._menuMobileOnScroll = this._menuMobileOnScroll || (() => {\n                menuToggleMobile.classList.remove('active');\n                menuMobile.classList.remove('active');\n            });\n            if (this.util.isMobile()) {\n                menuToggleMobile.onclick = () => {\n                    menuToggleMobile.classList.toggle('active');\n                    menuMobile.classList.toggle('active');\n                };\n                this.scrollEventSet.add(this._menuMobileOnScroll);\n            } else {\n                this.scrollEventSet.delete(this._menuMobileOnScroll);\n            }\n        }\n\n        initSwitchTheme() {\n            this.util.forEach(document.getElementsByClassName('theme-switch'), (button) => {\n                button.onclick = () => {\n                    document.body.classList.toggle('dark-theme');\n                    window.isDark = !window.isDark;\n                    window.localStorage && window.localStorage.setItem('theme', window.isDark ? 'dark' : 'light');\n                    this.initEcharts();\n                };\n            });\n        }\n\n        initHighlight() {\n            this.util.forEach(document.querySelectorAll('.highlight > .chroma'), (block) => {\n                const codes = block.querySelectorAll('pre.chroma > code');\n                const code = codes[codes.length - 1];\n                const lang = code ? code.className.toLowerCase() : '';\n                block.className += ' ' + lang;\n            });\n            this.util.forEach(document.querySelectorAll('.highlight > pre.chroma'), (block) => {\n                const chroma = document.createElement('div');\n                chroma.className = block.className;\n                const table = document.createElement('table');\n                chroma.appendChild(table);\n                const tbody = document.createElement('tbody');\n                table.appendChild(tbody);\n                const tr = document.createElement('tr');\n                tbody.appendChild(tr);\n                const td = document.createElement('td');\n                tr.appendChild(td);\n                block.parentElement.replaceChild(chroma, block);\n                td.appendChild(block);\n            });\n        }\n\n        initTable() {\n            this.util.forEach(document.querySelectorAll('.content table'), (table) => {\n                const wrapper = document.createElement('div');\n                wrapper.className = 'table-wrapper';\n                table.parentElement.replaceChild(wrapper, table);\n                wrapper.appendChild(table);\n            });\n        }\n\n        initHeaderLink() {\n            for (let num = 1; num <= 6; num++) {\n                this.util.forEach(document.querySelectorAll('.page.single .content > h' + num), (header) => {\n                    header.classList.add('headerLink');\n                    header.innerHTML = `<a href=\"#${header.id}\" class=\"header-mark\"></a>${header.innerHTML}`;\n                });\n            }\n        }\n\n        initToc() {\n            const tocCore = document.getElementById('TableOfContents');\n            if (tocCore === null) return;\n            if (this.util.isTocStatic()) {\n                const tocContentStatic = document.getElementById('toc-content-static');\n                if (tocCore.parentElement !== tocContentStatic) {\n                    tocCore.parentElement.removeChild(tocCore);\n                    tocContentStatic.appendChild(tocCore);\n                }\n                if (this._tocOnScroll) this.scrollEventSet.delete(this._tocOnScroll);\n            } else {\n                const tocContentAuto = document.getElementById('toc-content-auto');\n                if (tocCore.parentElement !== tocContentAuto) {\n                    tocCore.parentElement.removeChild(tocCore);\n                    tocContentAuto.appendChild(tocCore);\n                }\n                const toc = document.getElementById('toc-auto');\n                const page = document.getElementsByClassName('page')[0];\n                toc.style.maxWidth = `${page.getBoundingClientRect().left - 20}px`;\n                this._tocLinks = this._tocLinks || tocCore.getElementsByTagName('a');\n                this._tocLis = this._tocLis || tocCore.getElementsByTagName('li');\n                this._headerLinks = this._headerLinks || document.getElementsByClassName('headerLink') || [];\n                const headerIsFixed = window.desktopHeaderMode !== 'normal';\n                const headerHeight = document.getElementById('header-desktop').offsetHeight;\n                const TOP_SPACING = 20 + (headerIsFixed ? headerHeight : 0);\n                const minTocTop = toc.offsetTop;\n                const minScrollTop = minTocTop - TOP_SPACING + (headerIsFixed ? 0 : headerHeight);\n                this._tocOnScroll = this._tocOnScroll || (() => {\n                    const footerTop = document.getElementById('post-footer').offsetTop;\n                    const maxTocTop = footerTop - toc.getBoundingClientRect().height;\n                    const maxScrollTop = maxTocTop - TOP_SPACING + (headerIsFixed ? 0 : headerHeight);\n                    const rect = page.getBoundingClientRect();\n                    if (this.newScrollTop < minScrollTop) {\n                        toc.style.position = 'absolute';\n                        toc.style.top = `${minTocTop}px`;\n                        toc.style.left = `${rect.width + 20}px`;\n                    } else if (this.newScrollTop > maxScrollTop) {\n                        toc.style.position = 'absolute';\n                        toc.style.top = `${maxTocTop}px`;\n                        toc.style.left = `${rect.width + 20}px`;\n                    } else {\n                        toc.style.position = 'fixed';\n                        toc.style.top = `${TOP_SPACING}px`;\n                        toc.style.left = `${rect.left + rect.width + 20}px`;\n                    }\n\n                    this.util.forEach(this._tocLinks, (link) => { link.classList.remove('active'); });\n                    this.util.forEach(this._tocLis, (link) => { link.classList.remove('has-active'); });\n                    const INDEX_SPACING = 20 + (headerIsFixed ? headerHeight : 0);\n                    let activeTocIndex = this._headerLinks.length - 1;\n                    for (let i = 0; i < this._headerLinks.length - 1; i++) {\n                        const thisTop = this._headerLinks[i].getBoundingClientRect().top;\n                        const nextTop = this._headerLinks[i + 1].getBoundingClientRect().top;\n                        if ((i == 0 && thisTop > INDEX_SPACING)\n                         || (thisTop <= INDEX_SPACING && nextTop > INDEX_SPACING)) {\n                            activeTocIndex = i;\n                            break;\n                        }\n                    }\n                    if (activeTocIndex !== -1) {\n                        this._tocLinks[activeTocIndex].classList.add('active');\n                        let parent = this._tocLinks[activeTocIndex].parentElement;\n                        while (parent !== tocCore) {\n                            parent.classList.add('has-active');\n                            parent = parent.parentElement.parentElement;\n                        }\n                    }\n                });\n                this._tocOnScroll();\n                this.scrollEventSet.add(this._tocOnScroll);\n            }\n        }\n\n        initMermaid() {\n            if (window.mermaidArr) {\n                mermaid.initialize({startOnLoad: false, theme: 'null'});\n                this.util.forEach(window.mermaidArr, (id) => {\n                    const element = document.getElementById(id);\n                    mermaid.mermaidAPI.render('svg-' + id, window.contentMap[id], (svgCode) => {\n                        element.innerHTML = svgCode;\n                    }, element);\n                });\n            }\n        }\n\n        initEcharts() {\n            if (window.echartsArr) {\n                this._echartsArr = this._echartsArr || [];\n                for (let i = 0; i < this._echartsArr.length; i++) {\n                    this._echartsArr[i].dispose();\n                }\n                this._echartsArr = [];\n                this.util.forEach(window.echartsArr, (id) => {\n                    const chart = echarts.init(document.getElementById(id), window.isDark ? 'dark' : 'macarons', {renderer: 'svg'});\n                    chart.setOption(JSON.parse(window.contentMap[id]));\n                    this._echartsArr.push(chart);\n                });\n                this._echartsOnResize = this._echartsOnResize || (() => {\n                    for (let i = 0; i < this._echartsArr.length; i++) {\n                        this._echartsArr[i].resize();\n                    }\n                });\n                this.resizeEventSet.add(this._echartsOnResize);\n            }\n        }\n\n        initTypeit() {\n            if (window.typeitArr) {\n                for (let i = 0; i < window.typeitArr.length; i++) {\n                    const group = window.typeitArr[i];\n                    (function typeone(i) {\n                        const id = group[i];\n                        if (i === group.length - 1) {\n                            new TypeIt(`#${id}`, {\n                                strings: window.contentMap[id],\n                            }).go();\n                            return;\n                        }\n                        let instance = new TypeIt(`#${id}`, {\n                            strings: window.contentMap[id],\n                            afterComplete: () => {\n                                instance.destroy();\n                                typeone(i + 1);\n                            },\n                        }).go();\n                    })(0);\n                }\n            }\n        }\n\n        initSmoothScroll() {\n            if ((!this.util.isMobile() && window.desktopHeaderMode === 'normal')\n              || (this.util.isMobile() && window.mobileHeaderMode === 'normal')) {\n                new SmoothScroll('[href^=\"#\"]', {speed: 300, speedAsDuration: true});\n            } else {\n                new SmoothScroll('[href^=\"#\"]', {speed: 300, speedAsDuration: true, header: '#header-desktop'});\n            }\n        }\n\n        onScroll() {\n            const headers = [];\n            if (window.desktopHeaderMode === 'auto') headers.push(document.getElementById('header-desktop'));\n            if (window.mobileHeaderMode === 'auto') headers.push(document.getElementById('header-mobile'));\n            this.util.forEach(headers, (header) => {\n                header.classList.add('animated');\n                header.classList.add('faster');\n            });\n            const comments = document.getElementsByClassName('comment') || [];\n            if (comments.length) {\n                const container = document.getElementById('fixed-btn-container');\n                const button = document.createElement('a');\n                button.href = `#${comments[0].id}`;\n                button.id = 'comment-button';\n                button.className = 'fixed-button animated faster';\n                button.innerHTML = '<i class=\"fas fa-comment fa-fw\"></i>';\n                container.appendChild(button);\n            }\n            const buttons = document.getElementsByClassName('fixed-button');\n            const MIN_SCROLL = 10;\n            window.addEventListener('scroll', () => {\n                this.newScrollTop = this.util.getScrollTop();\n                const scroll = this.newScrollTop - this.oldScrollTop;\n                this.util.forEach(headers, (header) => {\n                    if (scroll > MIN_SCROLL) {\n                        header.classList.remove('fadeInDown');\n                        header.classList.add('fadeOutUp');\n                    } else if (scroll < - MIN_SCROLL) {\n                        header.classList.remove('fadeOutUp');\n                        header.classList.add('fadeInDown');\n                    }\n                });\n                this.util.forEach(buttons, (button) => {\n                    if (this.newScrollTop > 20) {\n                        if (scroll > MIN_SCROLL) {\n                            button.classList.remove('fadeIn');\n                            button.classList.add('fadeOut');\n                        } else if (scroll < - MIN_SCROLL) {\n                            button.style.display = 'block';\n                            button.classList.remove('fadeOut');\n                            button.classList.add('fadeIn');\n                        }\n                    } else {\n                        button.style.display = 'none';\n                    }\n                });\n                if (!this._scrollTimeout) {\n                    this._scrollTimeout = window.setTimeout(() => {\n                        this._scrollTimeout = null;\n                        for (let event of this.scrollEventSet) event();\n                    }, 10);\n                }\n                this.oldScrollTop = this.newScrollTop;\n            }, false);\n        }\n\n        onResize() {\n            window.addEventListener('resize', () => {\n                if (!this._resizeTimeout) {\n                    this._resizeTimeout = window.setTimeout(() => {\n                        this._resizeTimeout = null;\n                        for (let event of this.resizeEventSet) event();\n                        this.initMenuMobile();\n                        this.initToc();\n                        this.initSmoothScroll();\n                        this.initMermaid()\n                    }, 100);\n                }\n            }, false);\n        }\n\n        init() {\n            this.initMenuMobile();\n            this.initSwitchTheme();\n            this.initHighlight();\n            this.initTable();\n            this.initHeaderLink();\n            this.initMermaid();\n            this.initEcharts();\n            this.initTypeit();\n            this.initToc();\n            this.initSmoothScroll();\n\n            this.onScroll();\n            this.onResize();\n        }\n    }\n\n    const themeInit = () => {\n        const theme = new Theme();\n        theme.init();\n    };\n\n    if (document.readyState !== 'loading') {\n        themeInit();\n    } else {\n        document.addEventListener('DOMContentLoaded', themeInit, false);\n    }\n})();\n"]}
\ No newline at end of file
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=> {\n    'use strict';\n\n    class Util {\n        forEach(elements, handler) {\n            elements = elements || [];\n            for (let i = 0; i < elements.length; i++) {\n                handler(elements[i]);\n            }\n        }\n\n        getScrollTop() {\n            return (document.documentElement && document.documentElement.scrollTop) || document.body.scrollTop;\n        }\n\n        isMobile() {\n            return window.matchMedia('only screen and (max-width: 680px)').matches;\n        }\n\n        isTocStatic() {\n            return window.matchMedia('only screen and (max-width: 960px)').matches;\n        }\n    }\n\n    class Theme {\n        constructor() {\n            this.util = new Util();\n            this.newScrollTop = this.util.getScrollTop();\n            this.oldScrollTop = this.newScrollTop;\n            this.scrollEventSet = new Set();\n            this.resizeEventSet = new Set();\n        }\n\n        initMenuMobile() {\n            const menuToggleMobile = document.getElementById('menu-toggle-mobile');\n            const menuMobile = document.getElementById('menu-mobile');\n            this._menuMobileOnScroll = this._menuMobileOnScroll || (() => {\n                menuToggleMobile.classList.remove('active');\n                menuMobile.classList.remove('active');\n            });\n            if (this.util.isMobile()) {\n                menuToggleMobile.onclick = () => {\n                    menuToggleMobile.classList.toggle('active');\n                    menuMobile.classList.toggle('active');\n                };\n                this.scrollEventSet.add(this._menuMobileOnScroll);\n            } else {\n                this.scrollEventSet.delete(this._menuMobileOnScroll);\n            }\n        }\n\n        initSwitchTheme() {\n            this.util.forEach(document.getElementsByClassName('theme-switch'), (button) => {\n                button.onclick = () => {\n                    document.body.classList.toggle('dark-theme');\n                    window.isDark = !window.isDark;\n                    window.localStorage && window.localStorage.setItem('theme', window.isDark ? 'dark' : 'light');\n                    this.initEcharts();\n                };\n            });\n        }\n\n        initHighlight() {\n            this.util.forEach(document.querySelectorAll('.highlight > .chroma'), (block) => {\n                const codes = block.querySelectorAll('pre.chroma > code');\n                const code = codes[codes.length - 1];\n                const lang = code ? code.className.toLowerCase() : '';\n                block.className += ' ' + lang;\n            });\n            this.util.forEach(document.querySelectorAll('.highlight > pre.chroma'), (block) => {\n                const chroma = document.createElement('div');\n                chroma.className = block.className;\n                const table = document.createElement('table');\n                chroma.appendChild(table);\n                const tbody = document.createElement('tbody');\n                table.appendChild(tbody);\n                const tr = document.createElement('tr');\n                tbody.appendChild(tr);\n                const td = document.createElement('td');\n                tr.appendChild(td);\n                block.parentElement.replaceChild(chroma, block);\n                td.appendChild(block);\n            });\n        }\n\n        initTable() {\n            this.util.forEach(document.querySelectorAll('.content table'), (table) => {\n                const wrapper = document.createElement('div');\n                wrapper.className = 'table-wrapper';\n                table.parentElement.replaceChild(wrapper, table);\n                wrapper.appendChild(table);\n            });\n        }\n\n        initHeaderLink() {\n            for (let num = 1; num <= 6; num++) {\n                this.util.forEach(document.querySelectorAll('.page.single .content > h' + num), (header) => {\n                    header.classList.add('headerLink');\n                    header.innerHTML = `<a href=\"#${header.id}\" class=\"header-mark\"></a>${header.innerHTML}`;\n                });\n            }\n        }\n\n        initToc() {\n            const tocCore = document.getElementById('TableOfContents');\n            if (tocCore === null) return;\n            if (this.util.isTocStatic()) {\n                const tocContentStatic = document.getElementById('toc-content-static');\n                if (tocCore.parentElement !== tocContentStatic) {\n                    tocCore.parentElement.removeChild(tocCore);\n                    tocContentStatic.appendChild(tocCore);\n                }\n                if (this._tocOnScroll) this.scrollEventSet.delete(this._tocOnScroll);\n            } else {\n                const tocContentAuto = document.getElementById('toc-content-auto');\n                if (tocCore.parentElement !== tocContentAuto) {\n                    tocCore.parentElement.removeChild(tocCore);\n                    tocContentAuto.appendChild(tocCore);\n                }\n                const toc = document.getElementById('toc-auto');\n                const page = document.getElementsByClassName('page')[0];\n                toc.style.maxWidth = `${page.getBoundingClientRect().left - 20}px`;\n                this._tocLinks = this._tocLinks || tocCore.getElementsByTagName('a');\n                this._tocLis = this._tocLis || tocCore.getElementsByTagName('li');\n                this._headerLinks = this._headerLinks || document.getElementsByClassName('headerLink') || [];\n                const headerIsFixed = window.desktopHeaderMode !== 'normal';\n                const headerHeight = document.getElementById('header-desktop').offsetHeight;\n                const TOP_SPACING = 20 + (headerIsFixed ? headerHeight : 0);\n                const minTocTop = toc.offsetTop;\n                const minScrollTop = minTocTop - TOP_SPACING + (headerIsFixed ? 0 : headerHeight);\n                this._tocOnScroll = this._tocOnScroll || (() => {\n                    const footerTop = document.getElementById('post-footer').offsetTop;\n                    const maxTocTop = footerTop - toc.getBoundingClientRect().height;\n                    const maxScrollTop = maxTocTop - TOP_SPACING + (headerIsFixed ? 0 : headerHeight);\n                    const rect = page.getBoundingClientRect();\n                    if (this.newScrollTop < minScrollTop) {\n                        toc.style.position = 'absolute';\n                        toc.style.top = `${minTocTop}px`;\n                        toc.style.left = `${rect.width + 20}px`;\n                    } else if (this.newScrollTop > maxScrollTop) {\n                        toc.style.position = 'absolute';\n                        toc.style.top = `${maxTocTop}px`;\n                        toc.style.left = `${rect.width + 20}px`;\n                    } else {\n                        toc.style.position = 'fixed';\n                        toc.style.top = `${TOP_SPACING}px`;\n                        toc.style.left = `${rect.left + rect.width + 20}px`;\n                    }\n\n                    this.util.forEach(this._tocLinks, (link) => { link.classList.remove('active'); });\n                    this.util.forEach(this._tocLis, (link) => { link.classList.remove('has-active'); });\n                    const INDEX_SPACING = 20 + (headerIsFixed ? headerHeight : 0);\n                    let activeTocIndex = this._headerLinks.length - 1;\n                    for (let i = 0; i < this._headerLinks.length - 1; i++) {\n                        const thisTop = this._headerLinks[i].getBoundingClientRect().top;\n                        const nextTop = this._headerLinks[i + 1].getBoundingClientRect().top;\n                        if ((i == 0 && thisTop > INDEX_SPACING)\n                         || (thisTop <= INDEX_SPACING && nextTop > INDEX_SPACING)) {\n                            activeTocIndex = i;\n                            break;\n                        }\n                    }\n                    if (activeTocIndex !== -1) {\n                        this._tocLinks[activeTocIndex].classList.add('active');\n                        let parent = this._tocLinks[activeTocIndex].parentElement;\n                        while (parent !== tocCore) {\n                            parent.classList.add('has-active');\n                            parent = parent.parentElement.parentElement;\n                        }\n                    }\n                });\n                this._tocOnScroll();\n                this.scrollEventSet.add(this._tocOnScroll);\n            }\n        }\n\n        initMermaid() {\n            if (window.mermaidArr) {\n                mermaid.initialize({startOnLoad: false, theme: 'null'});\n                this.util.forEach(window.mermaidArr, (id) => {\n                    const element = document.getElementById(id);\n                    mermaid.mermaidAPI.render('svg-' + id, window.contentMap[id], (svgCode) => {\n                        element.innerHTML = svgCode;\n                    }, element);\n                });\n            }\n        }\n\n        initEcharts() {\n            if (window.echartsArr) {\n                this._echartsArr = this._echartsArr || [];\n                for (let i = 0; i < this._echartsArr.length; i++) {\n                    this._echartsArr[i].dispose();\n                }\n                this._echartsArr = [];\n                this.util.forEach(window.echartsArr, (id) => {\n                    const chart = echarts.init(document.getElementById(id), window.isDark ? 'dark' : 'macarons', {renderer: 'svg'});\n                    chart.setOption(JSON.parse(window.contentMap[id]));\n                    this._echartsArr.push(chart);\n                });\n                this._echartsOnResize = this._echartsOnResize || (() => {\n                    for (let i = 0; i < this._echartsArr.length; i++) {\n                        this._echartsArr[i].resize();\n                    }\n                });\n                this.resizeEventSet.add(this._echartsOnResize);\n            }\n        }\n\n        initTypeit() {\n            if (window.typeitArr) {\n                for (let i = 0; i < window.typeitArr.length; i++) {\n                    const group = window.typeitArr[i];\n                    (function typeone(i) {\n                        const id = group[i];\n                        if (i === group.length - 1) {\n                            new TypeIt(`#${id}`, {\n                                strings: window.contentMap[id],\n                            }).go();\n                            return;\n                        }\n                        let instance = new TypeIt(`#${id}`, {\n                            strings: window.contentMap[id],\n                            afterComplete: () => {\n                                instance.destroy();\n                                typeone(i + 1);\n                            },\n                        }).go();\n                    })(0);\n                }\n            }\n        }\n\n        initSmoothScroll() {\n            if ((!this.util.isMobile() && window.desktopHeaderMode === 'normal')\n              || (this.util.isMobile() && window.mobileHeaderMode === 'normal')) {\n                new SmoothScroll('[href^=\"#\"]', {speed: 300, speedAsDuration: true});\n            } else {\n                new SmoothScroll('[href^=\"#\"]', {speed: 300, speedAsDuration: true, header: '#header-desktop'});\n            }\n        }\n\n        onScroll() {\n            const headers = [];\n            if (window.desktopHeaderMode === 'auto') headers.push(document.getElementById('header-desktop'));\n            if (window.mobileHeaderMode === 'auto') headers.push(document.getElementById('header-mobile'));\n            this.util.forEach(headers, (header) => {\n                header.classList.add('animated');\n                header.classList.add('faster');\n            });\n            const comments = document.getElementsByClassName('comment') || [];\n            if (comments.length) {\n                const button = document.getElementById('comment-button');\n                button.href = `#${comments[0].id}`;\n                button.style.display = 'block';\n            }\n            const fixedButtons = document.getElementById('fixed-buttons');\n            const MIN_SCROLL = 10;\n            window.addEventListener('scroll', () => {\n                this.newScrollTop = this.util.getScrollTop();\n                const scroll = this.newScrollTop - this.oldScrollTop;\n                this.util.forEach(headers, (header) => {\n                    if (scroll > MIN_SCROLL) {\n                        header.classList.remove('fadeInDown');\n                        header.classList.add('fadeOutUp');\n                    } else if (scroll < - MIN_SCROLL) {\n                        header.classList.remove('fadeOutUp');\n                        header.classList.add('fadeInDown');\n                    }\n                });\n                if (this.newScrollTop > 20) {\n                    if (scroll > MIN_SCROLL) {\n                        fixedButtons.classList.remove('fadeIn');\n                        fixedButtons.classList.add('fadeOut');\n                    } else if (scroll < - MIN_SCROLL) {\n                        fixedButtons.style.display = 'block';\n                        fixedButtons.classList.remove('fadeOut');\n                        fixedButtons.classList.add('fadeIn');\n                    }\n                } else {\n                    fixedButtons.style.display = 'none';\n                }\n                if (!this._scrollTimeout) {\n                    this._scrollTimeout = window.setTimeout(() => {\n                        this._scrollTimeout = null;\n                        for (let event of this.scrollEventSet) event();\n                    }, 10);\n                }\n                this.oldScrollTop = this.newScrollTop;\n            }, false);\n        }\n\n        onResize() {\n            window.addEventListener('resize', () => {\n                if (!this._resizeTimeout) {\n                    this._resizeTimeout = window.setTimeout(() => {\n                        this._resizeTimeout = null;\n                        for (let event of this.resizeEventSet) event();\n                        this.initMenuMobile();\n                        this.initToc();\n                        this.initSmoothScroll();\n                        this.initMermaid()\n                    }, 100);\n                }\n            }, false);\n        }\n\n        init() {\n            this.initMenuMobile();\n            this.initSwitchTheme();\n            this.initHighlight();\n            this.initTable();\n            this.initHeaderLink();\n            this.initMermaid();\n            this.initEcharts();\n            this.initTypeit();\n            this.initToc();\n            this.initSmoothScroll();\n\n            this.onScroll();\n            this.onResize();\n        }\n    }\n\n    const themeInit = () => {\n        const theme = new Theme();\n        theme.init();\n    };\n\n    if (document.readyState !== 'loading') {\n        themeInit();\n    } else {\n        document.addEventListener('DOMContentLoaded', themeInit, false);\n    }\n})();\n"]}
\ No newline at end of file
diff --git a/i18n/en.toml b/i18n/en.toml
index f9b31e7..44b14e5 100644
--- a/i18n/en.toml
+++ b/i18n/en.toml
@@ -1,6 +1,14 @@
 # Translations for English
 # https://gohugo.io/content-management/multilingual/#translation-of-strings
 
+# === baseof ==
+[backToTop]
+other = "Back to Top"
+
+[viewComments]
+other = "View Comments"
+# === baseof ==
+
 # === Post ===
 [posts]
 other = "Posts"
diff --git a/i18n/fr.toml b/i18n/fr.toml
index a48fc64..aaa8b00 100644
--- a/i18n/fr.toml
+++ b/i18n/fr.toml
@@ -1,6 +1,14 @@
 # Translations for French
 # https://gohugo.io/content-management/multilingual/#translation-of-strings
 
+# === baseof ==
+[backToTop]
+other = "Retour en Haut"
+
+[viewComments]
+other = "Afficher les Commentaires"
+# === baseof ==
+
 # === Post ===
 [posts]
 other = "Posts"
diff --git a/i18n/zh-CN.toml b/i18n/zh-CN.toml
index 3eb30a7..f9c9e68 100644
--- a/i18n/zh-CN.toml
+++ b/i18n/zh-CN.toml
@@ -1,6 +1,14 @@
 # Translations for Simplified Chinese
 # https://gohugo.io/content-management/multilingual/#translation-of-strings
 
+# === baseof ==
+[backToTop]
+other = "回到顶部"
+
+[viewComments]
+other = "查看评论"
+# === baseof ==
+
 # === Post ===
 [posts]
 other = "文章"
diff --git a/layouts/_default/baseof.html b/layouts/_default/baseof.html
index 9a50e83..4a945a0 100644
--- a/layouts/_default/baseof.html
+++ b/layouts/_default/baseof.html
@@ -58,11 +58,16 @@
             {{- partial "footer.html" . -}}
         </div>
 
-        <div id="fixed-btn-container">
+        <div id="fixed-buttons" class="animated faster">
             {{- /* top button */ -}}
-            <a href="#" id="top-button" class="fixed-button animated faster">
+            <a href="#" id="top-button" class="fixed-button" title="{{ T `backToTop` }}">
                 <i class="fas fa-arrow-up fa-fw"></i>
             </a>
+
+            {{- /* comment button */ -}}
+            <a href="#" id="comment-button" class="fixed-button" title="{{ T `viewComments` }}">
+                <i class="fas fa-comment fa-fw"></i>
+            </a>
         </div>
 
         {{- /* Load JavaScript scripts and CSS */ -}}
diff --git a/resources/_gen/assets/scss/css/style.template.scss_90197bdac482216ecaaaae0fb88517c1.content b/resources/_gen/assets/scss/css/style.template.scss_90197bdac482216ecaaaae0fb88517c1.content
index bd532f8..25c4d2f 100644
--- a/resources/_gen/assets/scss/css/style.template.scss_90197bdac482216ecaaaae0fb88517c1.content
+++ b/resources/_gen/assets/scss/css/style.template.scss_90197bdac482216ecaaaae0fb88517c1.content
@@ -1,3 +1,3 @@
-@import url("https://fonts.googleapis.com/css2?family=Baloo+2:wght@500&display=swap");/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:0.67em 0}hr{box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace, monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;text-decoration:underline dotted}b,strong{font-weight:bolder}code,kbd,samp{font-family:monospace, monospace;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-0.25em}sup{top:-0.5em}img{border-style:none}button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}button,input{overflow:visible}button,select{text-transform:none}button,[type="button"],[type="reset"],[type="submit"]{-webkit-appearance:button}button::-moz-focus-inner,[type="button"]::-moz-focus-inner,[type="reset"]::-moz-focus-inner,[type="submit"]::-moz-focus-inner{border-style:none;padding:0}button:-moz-focusring,[type="button"]:-moz-focusring,[type="reset"]:-moz-focusring,[type="submit"]:-moz-focusring{outline:1px dotted ButtonText}fieldset{padding:0.35em 0.75em 0.625em}legend{box-sizing:border-box;color:inherit;display:table;max-width:100%;padding:0;white-space:normal}progress{vertical-align:baseline}textarea{overflow:auto}[type="checkbox"],[type="radio"]{box-sizing:border-box;padding:0}[type="number"]::-webkit-inner-spin-button,[type="number"]::-webkit-outer-spin-button{height:auto}[type="search"]{-webkit-appearance:textfield;outline-offset:-2px}[type="search"]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}details{display:block}summary{display:list-item}template{display:none}[hidden]{display:none}html{font-family:system,-apple-system,BlinkMacSystemFont,"PingFang SC","Segoe UI","Microsoft YaHei","wenquanyi micro hei","Hiragino Sans GB","Hiragino Sans GB W3","Roboto","Oxygen","Ubuntu","Cantarell","Fira Sans","Droid Sans","Helvetica 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.toc-title{display:block;display:flex;justify-content:space-between;font-weight:bold;line-height:2em;padding:0 .625rem}.single #toc-static details summary .toc-title i.details{line-height:2em}.single #toc-static details summary .toc-title:hover{cursor:pointer}.single #toc-static details summary::-webkit-details-marker{display:none}.single #toc-static details[open] i.details{transform:rotate(180deg)}.single #toc-static .toc-content{background-color:#f5f5f5}.single #toc-static .toc-content>nav>ul{margin:0;padding:.4rem .8rem}.single #toc-static .toc-content ul{list-style:none}.single #toc-static .toc-content ul ul{padding-left:1.25rem}.dark-theme .single #toc-static .toc-content{background-color:#272C34}.single .toc .toc-title{font-size:1.2rem}.single .toc .toc-content{font-size:.9rem}.single .toc ruby{background:#f5f5f5}.single .toc ruby rt{color:#a9a9b3}.dark-theme .single .toc ruby{background:#272C34}.dark-theme .single .toc ruby rt{color:#5d5d5f}.single .content h2,.single .content 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.1s transform;-o-transition:.1s margin .1s, .1s transform;transition:.1s margin .1s, .1s transform}.dark-theme #header-mobile .header-wrapper .header-container .menu-toggle span{background:#a9a9b3}#header-mobile .header-wrapper .header-container .menu-toggle span:nth-child(1){margin-bottom:.5rem}#header-mobile .header-wrapper .header-container .menu-toggle span:nth-child(3){margin-top:.5rem}#header-mobile .header-wrapper .header-container .menu-toggle.active span{-webkit-transition:.1s margin, .1s transform .1s;-moz-transition:.1s margin, .1s transform .1s;-o-transition:.1s margin, .1s transform .1s;transition:.1s margin, .1s transform .1s}#header-mobile .header-wrapper .header-container .menu-toggle.active span:nth-child(1){-webkit-transform:rotate(45deg) translate(0.4rem, 0.5rem);-moz-transform:rotate(45deg) translate(0.4rem, 0.5rem);-ms-transform:rotate(45deg) translate(0.4rem, 0.5rem);-o-transform:rotate(45deg) translate(0.4rem, 0.5rem);transform:rotate(45deg) translate(0.4rem, 0.5rem)}#header-mobile .header-wrapper .header-container .menu-toggle.active span:nth-child(2){opacity:0}#header-mobile .header-wrapper .header-container .menu-toggle.active span:nth-child(3){-moz-transform:rotate(-45deg) translate(0.4rem, -0.5rem);-ms-transform:rotate(-45deg) translate(0.4rem, -0.5rem);-webkit-transform:rotate(-45deg) translate(0.4rem, -0.5rem);-o-transform:rotate(-45deg) translate(0.4rem, -0.5rem);transform:rotate(-45deg) translate(0.4rem, -0.5rem)}#header-mobile .header-wrapper .menu{text-align:center;background:#fff;border-top:2px solid #161209;display:none;box-shadow:0px 2px 4px rgba(0,0,0,0.1),0px 4px 8px rgba(0,0,0,0.1)}#header-mobile .header-wrapper .menu a{display:block;line-height:2.5rem}#header-mobile .header-wrapper .menu.active{display:block}.dark-theme #header-mobile .header-wrapper .menu{background:#292a2d;border-top:2px solid #a9a9b3}.copyright{font-size:.875rem}.copyright .copyright-line{width:100%}.copyright .copyright-line .icp-br{display:none}.pagination{display:flex;flex-direction:row;justify-content:center;list-style:none;white-space:nowrap;width:100%;padding:1rem 0 0}.pagination a{-webkit-font-smoothing:antialiased;font-size:.8rem;color:#bfbfbf;letter-spacing:.1rem;font-weight:700;padding:5px 5px;text-decoration:none;transition:0.3s}.pagination li{padding-bottom:3px;margin:0 20px;box-sizing:border-box;position:relative;display:inline}.pagination li.disabled{display:none}.pagination li:hover a{color:#000}.dark-theme .pagination li:hover a{color:#fff}.pagination li:before,.pagination li:after{position:absolute;content:"";width:0;height:3px;background:#000;transition:0.3s;bottom:0px}.dark-theme .pagination li:before,.dark-theme .pagination li:after{background:#fff}.pagination li:before .active,.pagination li:after .active{width:100%}.pagination li:before{left:50%}.pagination li:after{right:50%}.pagination li:hover:before,.pagination li:hover:after{width:50%}.pagination li.active a{color:#000}.dark-theme .pagination li.active a{color:#fff}.pagination li.active:before,.pagination li.active:after{width:60%}@media only screen and (max-width: 1440px){.page{max-width:56%}}@media only screen and (max-width: 1200px){.page{max-width:52%}}@media only screen and (max-width: 960px){.page{max-width:80%}.page #toc-auto{display:none}.page #toc-static{display:block}}@media only screen and (max-width: 680px){#header-desktop{display:none}#header-mobile{display:block}.page{max-width:100%;padding-top:3.5rem}.page .categories-card .card-item{width:100%}.copyright .copyright-line .icp-splitter{display:none}.copyright .copyright-line .icp-br{display:block}}
 
 /*# sourceMappingURL=style.min.css.map */
\ No newline at end of file
diff --git a/src/js/theme.js b/src/js/theme.js
index 471979c..06abc46 100644
--- a/src/js/theme.js
+++ b/src/js/theme.js
@@ -250,15 +250,11 @@
             });
             const comments = document.getElementsByClassName('comment') || [];
             if (comments.length) {
-                const container = document.getElementById('fixed-btn-container');
-                const button = document.createElement('a');
+                const button = document.getElementById('comment-button');
                 button.href = `#${comments[0].id}`;
-                button.id = 'comment-button';
-                button.className = 'fixed-button animated faster';
-                button.innerHTML = '<i class="fas fa-comment fa-fw"></i>';
-                container.appendChild(button);
+                button.style.display = 'block';
             }
-            const buttons = document.getElementsByClassName('fixed-button');
+            const fixedButtons = document.getElementById('fixed-buttons');
             const MIN_SCROLL = 10;
             window.addEventListener('scroll', () => {
                 this.newScrollTop = this.util.getScrollTop();
@@ -272,20 +268,18 @@
                         header.classList.add('fadeInDown');
                     }
                 });
-                this.util.forEach(buttons, (button) => {
-                    if (this.newScrollTop > 20) {
-                        if (scroll > MIN_SCROLL) {
-                            button.classList.remove('fadeIn');
-                            button.classList.add('fadeOut');
-                        } else if (scroll < - MIN_SCROLL) {
-                            button.style.display = 'block';
-                            button.classList.remove('fadeOut');
-                            button.classList.add('fadeIn');
-                        }
-                    } else {
-                        button.style.display = 'none';
+                if (this.newScrollTop > 20) {
+                    if (scroll > MIN_SCROLL) {
+                        fixedButtons.classList.remove('fadeIn');
+                        fixedButtons.classList.add('fadeOut');
+                    } else if (scroll < - MIN_SCROLL) {
+                        fixedButtons.style.display = 'block';
+                        fixedButtons.classList.remove('fadeOut');
+                        fixedButtons.classList.add('fadeIn');
                     }
-                });
+                } else {
+                    fixedButtons.style.display = 'none';
+                }
                 if (!this._scrollTimeout) {
                     this._scrollTimeout = window.setTimeout(() => {
                         this._scrollTimeout = null;