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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> </head> <body> <h1>我的 Web 页面</h1> <p> 建议在运算符或者逗号后换行。 </p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = "Hello w3big."; </script> </body> </html>