代码党 [笔记] css 备注 表格 tr 隔行换色 table tr:nth-child(odd){background:#FFF;} table tr:nth-child(even){background:#F4F4F4;} transition 渐隐和背景过度 .div { transition: background-color 0.5s ease-out,opacity 0.5s; -webkit-transition: background-color 0.5s ease-out,opacity 0.