<ul class="site-tag fl">  
        <li><a data-title="科學" href="#"><i style="background-image: url(images/xiaozhan/main_ojls_1aa6000200891260.jpg)">  
        </i><span class="tag-tit">科學</span> </a></li>  
        <li><a data-title="動漫" href="#"><i style="background-image: url(images/xiaozhan/main_NH8v_2e310001ebd1118e.jpg)">  
        </i><span class="tag-tit">動漫</span> </a></li>  
        <li><a data-title="生活" href="#"><i style="background-image: url(images/xiaozhan/main_OtnR_43a60000050a118c.jpg)">  
        </i><span class="tag-tit">生活</span> </a></li>  
        <li><a data-title="插畫" href="#"><i style="background-image: url(images/xiaozhan/main_UD3z_2e510002074f118e.jpg)">  
        </i><span class="tag-tit">插畫</span> </a></li>  
        <li><a data-title="音樂" href="#"><i style="background-image: url(images/xiaozhan/main_krFk_6323000018bd125d.jpg)">  
        </i><span class="tag-tit">音樂</span> </a></li>  
        <li><a data-title="自然" href="#"><i style="background-image: url(images/xiaozhan/main_UAbs_764f0001ff601190.jpg)">  
        </i><span class="tag-tit">自然</span> </a></li>  
</ul>

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            //遮罩層，鼠標移動上去高度變化，變清晰  
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                //獲取當前點擊li元素在全部li元素中的索引  
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transition:height 0.5s ease; -webkit-transition:height 0.5s ease;   
-moz-transition:height 0.5s ease; -o-transition:height 0.5s ease;}  
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.site-tag li i{ display:block; height:90px; background-position:center center;  
opacity:0.3; filter:alpha(opacity=3);  /*設置透明度*/  
-webkit-transition:opacity 0.5 ease;   /**/  
-webkit-filter:grayscale(60%);         /**/  
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a:hover .tag-tit{ text-shadow:1px 1px 1px rgb(0,0,0,0.5);}