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<div id="box">
<span class="qq"></span>
</div>
输入 JavaScript 代码……
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.qq{
display:inline-block;
width:36px;
height:36px;
background:url("https://static.runcodex.com/images/mix/icon_qq.png") no-repeat;
transition:all .3s;
}
.qq:hover{
background:url("https://static.runcodex.com/images/mix/icon_qq.png") no-repeat 0 -36px;