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CSS3原生實現淡入淡出效果

<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<title>淡入淡出效果</title>
<style type="text/css">
    #targetDiv
    {
        width: 150px;
        height:200px;
        text-align:center;
        padding-top:80px;
        background: #8a8a8a;
        color: #fff;
        
        position:absolute;
        opacity: 0;
        top:50px;
        left:-100px;
        -webkit-transition: all .5s ease-in;
        -moz-transition: all .5s ease-in;
        transition: all .5s ease-in;
    }
    #targetDiv.move
    {
        left: 10px;
        opacity: 1;
    }
  
    .btnout,.btnin
    {
        padding:10px 20px;
        background: #ff5a37;
        color: #fff;
        text-decoration: none;
    }
</style>
</head>
<body>
    <a href="javascript:;" class="btnout">滑出</a>
    <a href="javascript:;" class="btnin">滑入</a>

    <div id="targetDiv">
        淡入淡出面板
    </div>

<script>
    (function(){
        document.querySelector('body').addEventListener('click',function(e){
            if(e.target.className === 'btnin')
            {
                document.querySelector('#targetDiv').className = 'move';
            }
            else
            {
                document.querySelector('#targetDiv').className = '';
            }
        },false);
    })();
</script>
</body>
</html>