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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script> function load(){ alert("Iframe已加载"); } </script> </head> <body> <iframe onload="load()" src="http://www.w3cschool.cc"> <p>你的浏览器不支持 iframes.</p> </iframe> </body> </html>