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Animation - 如何通过Javascript创建动画和更改target属性

move 【move】
我们想知道如何通过Javascript创建动画和更改target属性。
代码展示 运行结果 

<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
p{padding-left:60px;}
#ball{
    border-radius:50px;
    width:50px;
    height:50px;
    background:#ddd;
    position:absolute;
    top:0;
    left:0;
    -moz-transition: all 0.2s; 
    -webkit-transition: all 1s;  
    -ms-transition: all 1s;  
    -o-transition: all 1s;  
    transition: all 1s;  
}
#stage {
    height:800px;
    width:480px;
    background:#333;
}
</style>
<script type='text/javascript'>//<![CDATA[ 
window.onload=function(){
    var ball = document.getElementById('ball');
    document.addEventListener('click', function(ev){
        if (ev.clientX<450 && ev.clientY<770) {    
            ball.style.left = (ev.clientX-25)+'px';
            ball.style.top = (ev.clientY-25)+'px'; 
        } else {
        }
    },false);
}//]]>  
</script>
</head>
<body>
  Click the black stage. Ball will follow.
  <div id="stage">
    <div id="ball"></div>
  </div>
</body>
</html>