- 首先,先看一下實例,如下:<htmlxmlns=""><head><metahttp-equiv="Content-Type"content="text/html;charset=gb2312"/><style>#div1{margin:0pxauto;width:500px;height:370px;text-align:center;background:url(../demoimg/3.jpg);}#div2{ height:330px;filter:alpha(Opaci...
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