<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>遮罩层实例</title>
</head>
<body>
<button onclick="coverDiv()">显示</button>
</body>
<script type="text/javascript">
//显示遮罩
function coverDiv(){
var procbg = document.createElement("div"); //首先创建一个div
procbg.setAttribute("id","mybg"); //定义该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>
以上是完整实例。