我要评论效果图：
代码如下：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
#wrap{
width: 800px;
height: 500px;
border: 1px solid deeppink;
margin-left: 10px;
margin-top: 5px;
float: left;
}
#input1{
width: 80px;
margin: 5px auto 5px 10px;
font-size: 0;
float: left;
}
#div1{
width: 100px;
height: 100px;
background: hotpink;
position: absolute;
top: 20px;
left: 30px;
border-radius: 100px;
box-shadow: 0px 5px 5px rgba(0,0,0,.5);
}
input{
width: 100px;
height: 40px;
line-height: 40px;
text-align: center;
font-size: 18px;
display: block;
background: palegreen;
margin-bottom: 5px;
}
</style>
</head>
<body>
<div id="wrap">
<div id="div1"></div>
</div>
<div id="input1">
<input type="button" value="向左" id="btn2" />
<input type="button" value="向右" id="btn1"/>
<input type="button" value="向上" id="btn3" />
<input type="button" value="向下" id="btn4"/>
</div>
<script>
var obtn=document.getelementbyid('btn1');
var odiv=document.getelementbyid('div1');
var obtn2=document.getelementbyid('btn2');
var obtn3=document.getelementbyid('btn3');
var obtn4=document.getelementbyid('btn4');
obtn4.onclick=function(){
move(odiv,10,380,'0px 5px 5px rgba(0,0,0,.5)','top');
}
obtn3.onclick=function(){
move(odiv,-10,30,'0px -5px 5px rgba(0,0,0,.5)','top');
}
obtn2.onclick=function(){
move(odiv,-10,40,'-5px 5px 5px rgba(0,0,0,.5)','left');
}
obtn.onclick=function(){
move(odiv,10,680,'5px 5px 5px rgba(0,0,0,.5)','left');
}
function move(obj,val,target,bs,dir){
obj.style.boxshadow=bs;
clearinterval(obj.timer);
obj.timer=setinterval(function(){
var speed=parseint(getstyle(obj,dir))+val;
if(speed>=target&&val>0){
speed=target;
}
if(speed<=target&&val<0){
speed=target
}
obj.style[dir]=speed+'px';
if(speed==target){
clearinterval(obj.timer);
}
},30);
}
function getstyle(obj,sty){
return obj.currentstyle?obj.currentstyle[sty]:getcomputedstyle(obj)[sty];
}
</script>
</body>
</html>
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