问题：background-size:cover IE8 不支持 解决：使用img作为背景图，用z-index来控制层级
HTML：
<div class="box">
<div class="bg">
<img src="banner.img" alt="">
</div>
<div class='container'></div>
</div>
LESS:
.box{
width: 100%;
height:300px;
position: relative;
.bg{
width: 100%;
height: 300px;
z-index: -1;
position: absolute;
img{
width: 100%;
height: auto;
}
img{
height: 100%;
width: auto;
}
}
}
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