用javascript取得传递参数的个数的代码

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB2312" /> <title>js取得传递参数的个数</title> <script language="JavaScript" type="text/javascript"> function sum(a,b){ alert("实际传递的参数个数为：" + arguments.length); alert("计算</pre>结果为：" + (a+b)); } sum(1,2,3); alert("函数定义的参数个数为：" + sum.length); </script> </head> <body> </body> </html>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]