css 遮罩層

#maskLayer{ /*position:absolute;*/ top: 0; left: 0; right:0; bottom:0; width:100%; height:100%; background:rgba(0,0,0,0.6); background:#000\9;/*CSS Hack,只能對ie9如下瀏覽器ie6,ie7,ie8有效，否側ie10,FF,Cherome會失去透明

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