<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<style>
div {
width: 100px;
height: 100px;
background-color: pink;
position: absolute;
left: 0;
}
</style>
<body>
<button>运动到200</button>
<button>运动到400</button>
<div></div>
<script>
window.onload=function(){
var btn = document.getElementsByTagName("button");
var div = document.getElementsByTagName("div")[0];
btn[0].onclick = function () {
animent(div,200);
}
btn[1].onclick = function () {
animent(div,400);
}
function animent(ele,target){
clearInterval(ele.timer);
ele.timer=setInterval(function(){
var speed=(target-ele.offsetLeft)/10;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
ele.style.left=ele.offsetLeft+speed+"px";
console.log(1)
if(Math.abs(target-ele.offsetLeft)<=Math.abs(speed)){
ele.style.left=target+"px";
clearInterval(ele.timer);
}
},10)
}
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/sj1988/p/6600313.html