Jquery验证插件只验证@来改变这一点

将代码更改为这样

email: function( value, element ) {
    // From http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#e-mail-state-%28type=email%29
    // Retrieved 2014-01-14
    // If you have a problem with this implementation, report a bug against the above spec
    // Or use custom methods to implement your own email validation
    return this.optional( element ) || /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/.test( value );
}

function validateEmail(emailaddress){  
   var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/;  
   if(!emailReg.test(emailaddress)) {  
        alert("Please enter valid email id");
   }       
}

http://so.devilmaycode.it/jquery-validate-e-mail-address-regex/ 使用新的正则表达式 增加了对地址标签(+号)的支持

function isValidEmailAddress(emailAddress) { var pattern = /^([a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+(\.[a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+)*|"((([ \t]*\r\n)?[ \t]+)?([\x01-\x08\x0b\x0c\x0e-\x1f\x7f\x21\x23-\x5b\x5d-\x7e\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|\\[\x01-\x09\x0b\x0c\x0d-\x7f\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))*(([ \t]*\r\n)?[ \t]+)?")@(([a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|[a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF][a-z\d\-._~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]*[a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.)+([a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF][a-z\d\-._~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]*[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.?$/i; return pattern.test(emailAddress); };

if( !isValidEmailAddress( emailaddress ) ) { /* do stuff here (email is invalid) */ }

这是由用户Luca Filosofi提供的答案

你应该看到:jquery.validate.js，把它添加到你的项目

这样使用它:

<input id='email' name='email' class='required email'/>

<script type = "text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type = "text/javascript">
    function ValidateEmail(email) {
        var expr = /^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;
        return expr.test(email);
    };
    $("#btnValidate").live("click", function () {
        if (!ValidateEmail($("#txtEmail").val())) {
            alert("Invalid email address.");
        }
        else {
            alert("Valid email address.");
        }
    });
</script>
<input type = "text" id = "txtEmail" />
<input type = "button" id = "btnValidate" value = "Validate" />

我使用jQuery验证插件有几个原因。

你验证了，很好，现在呢?你需要显示错误，处理擦除它时，它是有效的，显示有多少错误，也许?它可以为你处理很多事情，不需要重新发明轮子。

另外，另一个巨大的好处是它托管在CDN上，在这里可以找到这个答案的当前版本:http://www.asp.net/ajaxLibrary/CDNjQueryValidate16.ashx这意味着客户端加载时间更快。