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var spy = function () {
var elems = document.querySelectorAll("h1, h2, h3, h4, h5, h6");
if (elems.length == 0) {
return;
}
var supportPageOffset = window.pageXOffset !== undefined;
var isCSS1Compat = ((document.compatMode || "") === "CSS1Compat");
var currentTop = supportPageOffset ? window.pageYOffset : isCSS1Compat ? document.documentElement.scrollTop : document.body.scrollTop;
var currentBottom = currentTop + window.height;
var pageBottom = window.pageBottom;
var meetUnread = false
var lastId = ""
elems.forEach(function (elem, idx) {
var elemTop = elem.offsetTop;
var id = elem.getAttribute('id');
//console.log(id,elem.offsetTop)
var navElem = document.getElementById(id + '-nav');
if (navElem==null) {
return
}
if (currentTop >= elemTop || currentBottom >= pageBottom) {
navElem.classList.add('toc-active');
} else {
if (meetUnread == false) {
meetUnread = true;
try{
document.getElementById(elems[idx-1].id+"-nav").scrollIntoView({ block:"center", behavior: 'smooth' });
} catch {
}
}
navElem.classList.remove('toc-active');
}
})
}
var onNavClick = function () {
}
/*$().ready(function () {
$(".collapse").each(function (idx) {
$(this).collapse("show");
});
//spy();
//$(window).bind('scroll', throttle(spy));
});*/
function throttle(func, timeout = 250) {
let last;
let timer;
return function () {
const context = this;
const args = arguments;
const now = +new Date();
if (last && now < last + timeout) {
clearTimeout(timer)
timer = setTimeout(function () {
last = now
func.apply(context, args)
}, timeout)
} else {
last = now
func.apply(context, args)
}
}
}
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