复制代码 代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>匀速运动演示</title>
<style type="text/css">
<>
</style>
<script type="text/javascript">
var timeId
function startMove(target){
var oDiv=document.getElementById('grap')
clearInterval(timeId); //这个地方就是为了防止多次点击速度加快的现象，很重要
speed=oDiv.offsetLeft<target?8:-9;
timeId=setInterval(function(){
if(Math.abs(oDiv.offsetLeft-target)<=6){
oDiv.style.left=target+'px'; //只要矩形移动到接近到目标点处就直接移动到目标点上，肉眼无法察觉速度变化
clearInterval(timeId); document.title="目标"+oDiv.style.left;
}
else{
oDiv.style.left=oDiv.offsetLeft+speed+'px';
}
},30);
}
</script>
</head>
<body>
<div id="div1"><span>100px</span></div>
<div id="div2"><span>800px</span></div>
<div id="div3"><span>300px</span></div>
<div id="div4"><span>500px</span></div>
<input type="button" value="移动到100px处"/>
<input type="button" value="移动到300px处"/>
<input type="button" value="移动到500px处"/>
<input type="button" value="移动到800px处"/>
<div id="grap" ></div>
</body>
</html>