JS如何控制DIV的透明度，呢？ <script>Layer1.style.alpha = "50%";</script> 不中？

仅支持 FF <script>document.getElementById("Layer1").style.opacity = "0.5";</script> IE Only <script>document.getElementById("Layer1").style.filter = "alpha(opacity=50%)";</script>

两句加起来就是ie、ff通吃 :D

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