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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <style> h1:before{ counter-increment:section; content:"第 " counter(section) " 部分:"; } </style> </head> <body> <p>点击“尝试一下”按钮设置 BODY 元素的 counter-reset 属性:</p> <button onclick="myFunction()">尝试一下</button> <h1>HTML 教程</h1> <h1>JavaScript 教程</h1> <h1>CSS 教程</h1> <script> function myFunction(){ document.body.style.counterReset="section"; } </script> </body> </html>