解决IE8、IE7和IE6 不兼容backgroud-size
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>demo</title>
<style type="text/css">
/* set the background of the body */
body {
margin: 0;
background: url(../skin/blue/images/public/bg.png) center top no-repeat;
-ms-behavior: url(../skin/blue/style/backgroundsize.min.htc); //-ms代表ie内核识别码
behavior: url(../skin/blue/style/backgroundsize.min.htc);
//backgroundsize.min.htc 下载地址：https://github.com/louisremi/background-size-polyfill/blob/gh-pages/backgroundsize.min.htc
}
.bgsCover {
background-size: cover;
}
/* this allows to use a second background in all browsers and IE8 */
body:after {
content: "";
background: transparent;
position: absolute;
z-index: -1;
top: 0;
right: 0;
bottom: 0;
left: 0;
}
</style>
</head>
<body class="bgsCover">
<div class="wrapper page_bg">
</div>
</body>
</html>