不多说,直接贴代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>document</title>
<style type="text/css">
body{
background: #111;
}
#cont{
background: #000;
width: 600px;
height: 800px;
margin: 20px auto;
position: relative;
}
.divbox{
position: absolute;
top:0px;
width: 6px;
}
.snows{
display: block;
}
</style>
</head>
<body>
<div id="cont">
</div>
<button id="btn">停止</button>
<button id="start">开始</button>
<script type="text/javascript">
// 获取元素
var $snows = document.getElementsByTagName('span');
var $cont = document.getElementById('cont')
var $btn = document.getElementById('btn')
var $start = document.getElementById('start')
var _top,
_left