<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html> <head> <title> New Document </title> <meta name="Generator" content="EditPlus"> <meta name="Author" content=""> <meta name="Keywords" content=""> <meta name="Description" content=""> <style type=text/css> </style> <script type="text/javascript"> function check(){ var obj=document.getElementById("email"); if(obj.value!=""){ var str = obj.value; if(str.indexOf("@")!=-1){ if(str.indexOf(".")!=-1){ var a=str.split("@"); if(a[0].length >1 ){document.getElementById("mess").innerHTML="<font color='green'>正确</font>"; }else{document.getElementById("mess").innerHTML="<font color='red'>错误</font>"; } }else{ document.getElementById("mess").innerHTML="<font color='red'>错误</font>"; } }else{ document.getElementById("mess").innerHTML="<font color='red'>错误</font>"; } } } </script> </head><body>
<label>email:</label><input type="text" id="email"> <input type="button" value="验证" οnclick="check()"> <span id="mess"></span> </body></html>