div背景透明样式：
样式代码：
.alert{filter:alpha(opacity=100); /* IE */ -moz-opacity:1.0; /* Moz + FF */
opacity: 1.0; height:300px; width:500px; background:#ccc; left:50%; top:50%;margin-top:-150px;margin-left:-250px;position:absolute;z-index:99; text-align:center; padding:20px;}
使用方法：
立即学习“前端免费学习笔记（深入）”；
背景透明
html代码：
<span class="tag"><span</span><span class="pln"> </span><span class="atn">style</span><span class="pun">=</span><span class="atv">"</span><span class="pln">color</span><span class="pun">:</span><span class="pln"> </span><span class="com">#333333</span><span class="atv">"</span><span class="tag">><span</span><span class="pln"> </span><span class="atn">style</span><span class="pun">=</span><span class="atv">"</span><span class="pln">color</span><span class="pun">:</span><span class="pln"> </span><span class="com">#333333</span><span class="atv">"</span><span class="tag">></span><span class="pln">100素材网</span><span class="tag"></span></span></span> .alert{filter:alpha(opacity=100); /* IE */ -moz-opacity:1.0; /* Moz + FF */ opacity: 1.0; height:300px; width:500px; background:#ccc; left:50%; top:50%;margin-top:-150px;margin-left:-250px;position:absolute;z-index:99; text-align:center; padding:20px}100素材网
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