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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script> function breakout(){ if (window.top!=window.self) { window.top.location="tryjs_breakout.html"; } } </script> </head> <body> <input type="button" onclick="breakout()" value="跳出框架!"> </body> </html>