<!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=utf-8" /> <title>无标题文档</title> <!--一、函数--> <script> function hanshu() { document.write("欢迎") } </script> <!--二、带参数的函数--> <script> function canshu(txt) { alert(txt) } </script> <!--三、带返回值的函数--> <script> function fanhui() { return ("wwz") } </script> <!--四、带有返回值并带有参数的函数--> <script> function chengfa(a,b) { return(a*b) } </script> </head> <body> <!--一、函数--> <input type="button" onclick="hanshu()" value="调用"> <!--二 、带参数的函数--> <input type="button" onclick="canshu('参数')" value="调用参数"> <!--三、带返回值的函数--> <script> document.write(fanhui()) </script> <!--四、带有返回值并带有参数的函数--> <script> document.write(chengfa(5,6)) </script> </body> </html>