<!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" xml:lang="zh-cn"> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" /> <title>网页标题</title> <meta name="keywords" content="关键字列表" /> <meta name="description" content="网页描述" /> <link rel="stylesheet" type="text/css" href="" /> <style type="text/css"></style> </head> <body> <script type="text/javascript"> /*创建一个函数，实现求外部传递进来3个数据的和，并将结果返回 function getSum(a,b,c){ return a+b+c;} getSum(10,20,30);*/ function sum(a,b,c){ return a+b+c; } var s=sum(10,20,30); document.write(s); </script> </body> </html>
原文：http://www.cnblogs.com/pengxin/p/6147889.html