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<!DOCTYPE html> <html> <head> <style> h1::before { counter-increment: section; content: "Section " counter(section) ". "; } </style> </head> <body> <p>点击“试一试”按钮，设置 BODY 元素的计数器重置属性：</p> <button onclick="myFunction()">试一试</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>