<!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="utf-8"/> <title>CSS Test Page</title> <style type="text/css"> .b{ opacity: 0; /* b div 隐藏*/ } .a:hover .b{ opacity: 1; /* 鼠标经过 a div 时 b div 显示*/ } </style> </head> <body> <div class="a"> This is the a div <div class="b"> <p>this is b div</p> /* a div 嵌套 b div*/ </div> </div> </body> </html>
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