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javascript+html實現遮罩層效果

<!DOCTYPE html>  
<html>  
    <head>  
        <meta charset="UTF-8">  
        <title>遮罩層例項</title>  
    </head>  
    <body>  
        <button onclick="coverDiv()">顯示</button>  
    </body>  
    <script type="text/javascript">  
    //顯示遮罩  
function coverDiv(){ var procbg = document.createElement("div"); //首先建立一個div procbg.setAttribute("id","mybg"); //定義該div的id procbg.style.background = "#000000"; procbg.style.width = "100%"; procbg.style.height = "100%"; procbg.style.position = "fixed"
; procbg.style.top = "0"; procbg.style.left = "0"; procbg.style.zIndex = "500"; procbg.style.opacity = "0.6"; procbg.style.filter = "Alpha(opacity=70)"; document.body.appendChild(procbg); } //取消遮罩 function hide()
{
var body = document.getElementsByTagName("body"); var mybg = document.getElementById("mybg"); body[0].removeChild(mybg); }
</script> </html>

以上是完整例項。