每天CookBook之JavaScript-059

  • 向页面添加元素
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>059</title>
    <style type="text/css">
    .overlay
    {
        background-color: #000;
        opacity: .7;
        filter: alpha(opacity=70);
        position: absolute;top:0;left: 0;
        width: 100%; height: 100%;
        z-index: 10;    
    }
    </style>
</head>
<body>
    
</body>
<script type="text/javascript">
function expandOverlay () {
     var overlay = document.createElement("div");
     overlay.setAttribute("id", "overlay");
     overlay.setAttribute("class", "overlay");
     document.body.appendChild(overlay);
}
(function () {
    expandOverlay();
})(); 
</script>
</html>
posted @ 2016-07-22 23:28  4Thing  阅读(84)  评论(0)  编辑  收藏  举报