日期:2014-05-16 浏览次数:20381 次
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> </head> <body> <script type="text/javascript"> document.write("js1\n"); </script> <script type="text/javascript"> document.write("js2\n"); </script> <script type="text/javascript"> document.write("js3\n"); </script> <script type="text/javascript"> document.write("js4\n"); </script> <script type="text/javascript"> /*删除最后一个javascript,使之不执行,页面上不会出现 js5 */ </script> <script type="text/javascript" id="target"> document.write("js5\n"); </script> </body> </html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> </head> <body> <script type="text/javascript"> document.write("js1\n"); </script> <script type="text/javascript"> document.write("js2\n"); </script> <script type="text/javascript"> document.write("js3\n"); </script> <script type="text/javascript"> document.write("js4\n"); </script> <script type="text/javascript"> //实现的原理是重写目标代码段里调用的第一个函数,从里面throw一个异常出来,终结掉整个代码段的执行 //首先保存write函数,以便执行完以后恢复。如果你不需要恢复,那么就不需要保存 var temp=document.write; document.write=function(){throw 1;}; </script> <script type="text/javascript" id="target"> document.write("js5\n"); alert(1); </script> <script type="text/javascript"> //恢复write函数,以便其他调用 document.write=temp; </script> <script type="text/javascript"> document.write("js6\n"); </script> </body> </html>