1、通過濾鏡的方法
body?{
background:url()no-repeatcenter;
-webkit-background-size:?cover;
-moz-background-size:?cover;
-o-background-size:?cover;
background-size:?cover;
filter:?progid:?DXImageTransform.Microsoft.AlphaImageLoader(?src='',?sizingMethod='scale');
-ms-filter:?progid:?DXImageTransform.Microsoft.AlphaImageLoader(?src='',?sizingMethod='scale');
}
2、通過htc文件（通過計算屏幕尺寸控制img標(biāo)簽尺寸，模擬background-size:cover;效果）
[css]view plaincopy
you?can?use?this?file?(https://github.com/louisremi/background-size-polyfill?“background-size?polyfill”)?for?IE8that?is?really?simple?to?use:
.selector?{
background-size:?cover;
-ms-behavior:url(/backgroundsize.min.htc);
}
