添加这个属性是什么意思
.search-submit{ float:left; cursor:pointer; height: 29px; width: 29px; background: transparent url(http://img1.sycdn.imooc.com//52da5df800012b1e02220137.jpg) no-repeat -30px -107px; border: 0; }这个background里为什么添加-30px -107px;
.search-submit{ float:left; cursor:pointer; height: 29px; width: 29px; background: transparent url(http://img1.sycdn.imooc.com//52da5df800012b1e02220137.jpg) no-repeat -30px -107px; border: 0; }这个background里为什么添加-30px -107px;
2018-01-30
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