前端开发者前端开发系统环境搭建 网站前端后端实战开发案例视频 前端开发有哪些证书
html 代码
<!DOCTYPE html>
<html lang=”en”>
<head>
<meta charset=”utf-8″>
<style type=”text/css”>
ul,
li {
padding: 0;
margin: 0;
}
li {
list-style: none;
}
.box {
width: 800px;
height: 450px;
margin: 50px auto;
overflow: hidden;
position: relative;
}
.box span {
width: 40px;
height: 60px;
display: block;
position: absolute;
top: 225px;
margin-top: -20px;
cursor: pointer;
z-index: 1;
}
.box #left {
background: url(‘http://cdn.attach.qdfuns.com/notes/pics/201701/14/042311cbd7gbjd7sggkd2b.png’) no-repeat;
left: 0;
}
.box #right {
background: url(‘http://cdn.attach.qdfuns.com/notes/pics/201701/14/042241w8z4hx4m4pjhyjzs.png’) no-repeat;
right: 0;
}
#ad {
width: 4000px;
height: 450px;
position: absolute;
}
#ad li {
float: left;
}
</style>
<script type=”text/javascript”>
window.onload = function () {
var ad = document.getElementById(“ad”);
var timer = null;//管理定时器
var leader = 0;
//1秒之后再开启定时器
timer = setTimeout(function () {
timer = setInterval(autoAd, 30);
}, 1000);
//开启定时器
function autoAd() {
leader -= 5;
leader <= -3200 ? leader = 0 : leader;
ad.style.left = leader + “px”;
}
//鼠标划入 关闭定时器
ad.onmouseover = function () {
clearInterval(timer);
}
//鼠标离开 开启定时器
ad.onmouseout = function () {
timer = setInterval(autoAd, 20);
}
}
</script>
</head>
<body>
<div class=”box”>
<ul id=”ad”>
<li><img src=”http://cdn.attach.qdfuns.com/notes/pics/201701/14/042153lscsitwp7sszb6zs.jpg” alt=””></li>
<li><img src=”http://cdn.attach.qdfuns.com/notes/pics/201701/14/042152pfbkbfe8vbtvulfu.jpg” alt=””></li>
<li><img src=”http://cdn.attach.qdfuns.com/notes/pics/201701/14/042153u3jgn0ds43ndd3dz.jpg” alt=””></li>
<li><img src=”http://cdn.attach.qdfuns.com/notes/pics/201701/14/042152juuohne22z60hbsb.jpg” alt=””></li>
<li><img src=”http://cdn.attach.qdfuns.com/notes/pics/201701/14/042153lscsitwp7sszb6zs.jpg” alt=””></li>
</ul>
<span id=”left”></span>
<span id=”right”></span>
</div>
</body>
</html>
到底哪些人在做前端开发 前端开发项目流程 一个具体的前端开发项目
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