做到传入2个参数哪里还正常，但把speed用if规定后就用不了了，求大神解答。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
*{margin: 0;padding: 0;}
#div1{
height: 300px;
width: 200px;
position: relative;
left: -200px;
background-color: red;
}
#share{
display: block;
position: relative;
left: 200px;
top: 15px;
width: 16px;
background-color: #FFE500;
}
</style>
<script>
window.onload=function(){
var oDiv=document.getElementById('div1');
oDiv.onmouseover=function(){
startMove(0);
}
oDiv.onmouseout=function(){
startMove(-200);
}
}
var timer=null;
function startMove(starget){
clearInterval(timer);
timer=setInterval(function(){
var speed=0;
if(oDiv.offsetLeft>starget){
speed = -10;
}
else{
speed = 10;
}
var oDiv=document.getElementById('div1');
if(oDiv.offsetLeft==starget){
clearInterval(timer);
}
else{
oDiv.style.left=oDiv.offsetLeft+speed+'px';
}
},30)
}
</script>
</head>
<body>
<div id="div1">
<span id="share">分享</span>
</div>
</body>
</html>
