<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
#div1
{
width: 100px;
height: 100px;
background-color: green;
position: absolute;
left:600px;
top: 50px;
}
#div2
{
width:1px;
height:300px;
position:absolute;
background-color:gray;
left:300px;
top:0px;
}
</style>
</head>
<script type="text/javascript">
var timer = null;
function Move() {
var oDiv = document.getElementById("div1");
timer = setInterval(function () {
var speed = (300 - oDiv.offsetLeft) / 10;
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
oDiv.style.left = oDiv.offsetLeft + Math.ceil(speed) + "px";
}, 30);
}
</script>
<body>
<input type="button" id="btn" value="开始运动" onclick="Move()" />
<div id="div1"></div>
<div id="div2"></div>
</body>
</html>