<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <script> var num； var theResponse = window.prompt("移动车辆至新的会员名下，请输入会员memNo号: ",""); if(theResponse == null || theResponse == "" || isNaN(theResponse)){ alert(‘num为空，不是数字‘); }else{ alert("theResponse$$:" + theResponse); } </script> </head> <body> </body> </html>
原文：http://www.cnblogs.com/simpledev/p/3958524.html