JavaScript之动画缩放 

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <style type="text/css">
        .div{
            width: 200px;
            height: 200px;
            background-color: lightgreen;
        }
    </style>
</head>
<body>
<div class="div"></div>
<script type="text/javascript">
    window.onload=function(){
        var div=document.getElementsByClassName('div')[0];
        var timer=null;
        function larger(obj,goal,speed){
            var offsetwidth=obj.offsetWidth;
            var offsetheight=obj.offsetHeight;
            if(offsetwidth<goal&&offsetheight<goal){
                obj.style.height=(offsetheight+speed)+'px';
                obj.style.width=(offsetwidth+speed)+'px';
                clearTimeout(timer);
                timer=setTimeout(function(){
                    larger(obj, goal, speed);
                },50);
            }
            else{
                clearTimeout(timer);
            }
        }
        div.onclick=function(){
            larger(this, 400, 10);
        }
    }
</script>
</body>
</html>

 

posted @ 2017-10-28 15:59  learn_by_doing  阅读(547)  评论(0)    收藏  举报