<!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> <title> return 返回值 </title> <meta http-equiv = "content-type" content ="text/html;charset=utf-8" /> </head> <body> <script text="type/javascript"> function sum(iNum1, iNum2) { return iNum1 + iNum2; alert(iNum1 + iNum2); } //sum(1,3);//不会执行alert语句 //函数中可能有多个 return 语句 //例如，返回两个整数的差值 function diff(iNum1, iNum2) { if (iNum1 > iNum2) { return iNum1 - iNum2; } else { return iNum2 - iNum1; } } //diff(33,21) //diff(21,33) </script> </body> </html>