<!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>测试：用Javascript正则表达式验证Email地址</title> </head> <body style="background:#fff;"> <p style="margin-bottom:20px;"> 输入Email地址，点击测试，错误的地址将返回 false...正确的，显示成? 自己猜： </p> <input type="text" value="" id="mail"/> <input type="button" value="测试" id="checkout" onclick="isValidMail(sText)" /> <script type="text/javascript"> var sText = document.getElementById('mail').value; document.getElementById('mail').onblur = function sValue(){ sText = this.value; } function isValidMail(sText) { var reMail = /^(?:[a-zA-Z0-9]+[_-+.]?)*[a-zA-Z0-9]+@(?:([a-zA-Z0-9]+[_-]?)*[a-zA-Z0-9]+.)+([a-zA-Z]{2,})+$/; alert(reMail.test(sText)) } </script> </body> </html>