javascript - 如何利用clearInterval消除setInterval？
本文介绍了javascript - 如何利用clearInterval消除setInterval？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
问 题
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title></title>
</head>
<style type="text/css">
.top-nav {
font-size: 14px;
font-weight: bold;
list-style: none;
}
.top-nav li {
float: left;
margin-left: 1px;
}
.top-nav li a {
line-height: 34px;
text-decoration: none;
background: #3f240e;
color: #fff;
display: block;
width: 80px;
text-align: center;
}
.top-nav ul {
list-style: none;
display: none;
padding: 0;
position: absolute;
height: 0;
overflow: hidden;
}
.top-nav li a:hover {
background: url(images/slide-bg.png) 0 0 repeat-x;
}
.note {
color: #3f240e;
display: block;
background: url(images/slide-bg.png) 0 0 repeat-x;
}
.corner {
display: block;
height: 11px;
background: url(images/corner.png) 31px 0 no-repeat;
}
</style>
<script type="text/javascript">
window.onload = function() {
var Lis = document.getElementsByTagName("li");
var timer=null;
for(var i=0; i<Lis.length; i++) {
Lis[i].onmouseover = function() {
var u = this.getElementsByTagName("ul")[0];
if(u != undefined) {
u.style.display = "block";
clearInterval(timer);
timer=setInterval(AddH,10);
}
}
Lis[i].onmouseout = function() {
var u = this.getElementsByTagName("ul")[0];
if(u != undefined) {
clearInterval(timer);
timer=setInterval(SubH,100);
}
}
}
}
function AddH() {
var ulList = document.getElementById("mnuUL");
var h = ulList.offsetHeight;
h += 1;
if(h>42) {
return;
}
else {
ulList.style.height = h + "px";
}
}
function SubH() {
var ulList = document.getElementById("mnuUL");
var h = ulList.offsetHeight;
h -= 1;
if(h <=0) {
ulList.style.height =0;
}
else {
ulList.style.display =h + "px";
}
}
</script>
<body>
<ul class="top-nav">
<li><a href="#"><span class="note">慕课网</span></a></li>
<li><a href="#">课堂大厅</a></li>
<li><a href="#">学习中心</a>
<ul id="mnuUL">
<span class="corner"></span>
<li><a href="#">前端课程</a></li>
<li><a href="#">手机开发</a></li>
<li><a href="#">后台编程</a></li>
</ul>
</li>
<li><a href="#">关于我们</a></li>
</ul>
</body>
</html>
解决方案
var myTimer = setInterval(....);如果需要消除, 则
clearInterval(myTimer)这篇关于javascript - 如何利用clearInterval消除setInterval？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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