background-size兼容

<style>
html, body
{
margin: 0;
padding: 0;
background: url('images/bg.jpg') no-repeat;
background-attachment:fixed;
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/bg.jpg', sizingMethod='scale');
-ms-filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/bg.jpg', sizingMethod='scale');
background-size: cover;
-moz-background-size: cover;
-webkit-background-size: cover;
font-family: "微软雅黑";
}
</style>