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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> </head> <body> <p id="demo"></p> <script> var r=Math.random(); var x=document.getElementById("demo") if (r>0.5){ x.innerHTML="<a href='http://www.w3big.com'>访问本教程</a>"; } else{ x.innerHTML="<a href='http://wwf.org'>Visit WWF</a>"; } </script> </body> </html>