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<!DOCTYPE html> <html> <head> <style> p { counter-increment: myIndex; } p::before { content:counter(myIndex); } </style> </head> <body> <p>先做一个变量（myIndex），让它在每次出现p元素时增加。</p> <p>然后在所有p元素前面插入计数器</p> </body> </html>