html添加遮罩的代码如下所示
使用div+css ,加载中的图片是网上下载的动图,可以根据自己需要进行修改
<!DOCTYPE html>
<html>
<head><title>DIV CSS遮罩层</title><script language="javascript" type="text/javascript">function showdiv() {document.getElementById("bg").style.display ="block";/* document.getElementById("show").style.display ="block";*/}function hidediv() {document.getElementById("bg").style.display ='none';/*document.getElementById("show").style.display ='none';*/}</script><style type="text/css">#bg{ display: none; position: absolute; top: 0%; left: 0%; width: 100%; height: 100%; background-color: black; z-index:1001; -moz-opacity: 0.7; opacity:.70; filter: alpha(opacity=70);}#show{display: none; position: absolute; top: 25%; left: 22%; width: 53%; height: 49%; padding: 8px; border: 8px solid #E8E9F7; background-color: white; z-index:1002; overflow: auto;}/*遮罩图片居中显示*/.zhezhao{position: absolute;top:50%;left: 50%;transform: translate(-50%,-50%);}</style>
</head>
<body>
<input id="btnshow" type="button" value="Show" onclick="showdiv();"/>
<div id="bg"><img class="zhezhao" src="img/timg.gif">
</div> <!-- 遮罩层 -->
<div id="show">测试<input id="btnclose" type="button" value="Close" onclick="hidediv();"/>
</div>
</body>
</html>
显示效果如下图: