.opacity{ filter:alpha(opacity=50); /* IE */ -moz-opacity:0.5; /* 老版Mozilla */ -khtml-opacity:0.5; /* 老版Safari */ opacity: 0.5; /* 支持opacity的浏览器*/} 用 来设定一个元素为半透明 .filter = "alpha(opacity=" + opacity + ")"; /* IE */ .MozOpacity = (opacity / 100); /* 老版Mozilla */ .KhtmlOpacity = (opacity / 100); /