基础的思路，可以在此基础加强
<!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=utf-8" />
<title>js分享到</title>
<style>
*{margin:0; padding:0;}
#div1{width:100px; height:200px; position:absolute; left:-100px; background:red;}
#div2{width:50px; height:100px; background:blue; position:absolute; right:-50px; top:50px;}
</style>
<script>
window.onload=function(){
var oDiv1=document.getElementById('div1');
var oDiv2=document.getElementById('div2');
var Timer=null; //全局定时器
oDiv1.onmouseover=function(){ //此处用了冒泡
startMove(0,10);
}
oDiv1.onmouseout=function(){
startMove(-100,-10);
} function startMove(target,speed){
clearInterval(Timer); //每次只开一个定时器，
Timer=setInterval(function(){
if(oDiv1.offsetLeft==target){ //判断目的地
clearInterval(Timer);
} else{
oDiv1.style.left=oDiv1.offsetLeft+speed+'px';
}
},30);
}
}
</script>
</head>
<body>
<div id="div1">
<div id="div2">
分享到
</div>
</div>
<script> </script>
</body>
</html>