![精通:nth-child-UI树欲静](http://www.oveui.com/wp-content/uploads/2016/06/20111226194409625795.jpg)
精通:nth-child
:nth-child 基本用法 :nth-child :nth-child(8) 选中第8个子元素 li:nth-child(8) span { background-color: #298EB2; box-shadow: -3px -3p...
:nth-child 基本用法 :nth-child :nth-child(8) 选中第8个子元素 li:nth-child(8) span { background-color: #298EB2; box-shadow: -3px -3p...