<html> <head> <style> html, body, ul { margin: 0; padding: 0; } ul { width: 100%; display: flex; flex-wrap: wrap; /* justify-content: space-between; */ } li { width: 33%; background: #ededee; margin-top: 1rem; list-style: none; } ul:after { content: ""; width: 30%; height: 0px; visibility: hidden; } </style> </head> <body> <ul> <li>1</li> <li>1</li> <li>1</li> <li>1</li> <li>1</li> <li>1</li> <li>1</li> <li>1</li> <li>1</li> <li>1</li> <li>1</li> </ul> </body> </html>
主要代码：
父：
ul { width: 100%; display: flex; flex-wrap: wrap; justify-content: space-between; }
子：
li { width: 33%; }
