源代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>编程字典</title> <style> .dropdown { position: relative; display: inline-block; } .dropdown-content { display: none; position: absolute; background-color: #f9f9f9; min-width: 160px; box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2); padding: 12px 16px; } .dropdown:hover .dropdown-content { display: block; } </style> </head> <body> <h2>鼠标经过下拉显示</h2> <p>移动鼠标到下面的文字，打开下拉菜单的内容.</p> <div class="dropdown"> <span>鼠标经过我</span> <div class="dropdown-content"> <p>Hello World!</p> </div> </div> </body> </html>
运行结果