position:relative;是相对于自身偏移的。
position:absolute;才是相对于父元素父元素发生偏移的!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!我还以为我理解错了,
position:absolute;才是相对于父元素父元素发生偏移的!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!我还以为我理解错了,
2016-11-24
background:#ccc url(http://img1.sycdn.imooc.com//5411027300014f0200220030.jpg) no-repeat right;