没有类似Javascript的语句吗?

首先,我觉得你的搜索有点太泛化了(e、 g.如果有人有电子邮件地址怎么办 shotmail@mydomain.com "?

试试这个:

var notAllowed = /@(?:aol|hotmail|g(?:oogle)?mail|yahoo)\.com$/i;
// You may want to cover other domains under .co.uk etc.

if ( notAllowed.test(emailAddress) ) {
    alert("No Hotmail, Gmail, Yahoo or AOL emails are allowed!");  
    return false;
}

我不得不问,为什么你禁止人们使用这些电子邮件地址((出于兴趣)

而且,这确实应该在服务器端完成(我假设您没有使用SSJS)

使用JavaScript REGEXP对象。阅读 W3schools page 或 their tutorial 举几个例子。如果您对其中任何一个都有问题,只需在此处发布,我们将详细介绍:)

var Email = 'testmail@yahoo.com';

var mail_pattern=new RegExp("/aol.com|hotmail|gmail|yahoo/");
if (mail_pattern.test(Email)) {
 alert("No Hotmail, Gmail, Yahoo or AOL emails are allowed!");  
}
else {
alert("mail ok")
}

最好的方法是REGEXP。快速简单的东西也许是方法的索引,但它是如此的有限。

http://www.quirksmode.org/js/strings.html#indexof

(我有点暗示你对JavaScript不太了解)

function validateEmail (email) {
    // Checks if whatever variable submitted is a string.
    // This line is NOT useful if you're sure of whatever being sent to the function,
    // but otherwise it'll save your ass for a runtime error.
    if (email.constructor != String) return false;

    // I'm not sure the search patterns are 100 % (they probably ain't),
    // but the @'s should make the search less generic.
    var emailsNotAllowed = ["@aol.com", "@hotmail.", "@live.", "@gmail.", "@google.", "@yahoo."];
    // Convert the email address to lower case, so you're sure nothing is going wrong with the patterns.
    email = email.toLowerCase();
    // Loop through all the patterns, and check if one of them matches the email address provided.
    for (var i = 0; i < emailNotAllowed.length; i++) {
        // The indexOf method will return zero if the string could not be found.
        // Otherwise, it will return a positive number, which in JavaScript validates to a true condition.
        if (email.indexOf(emailsNotAllowed[i])) {
            alert("No Hotmail, Gmail, Yahoo or AOL emails are allowed!");
            return false;
        }
    }
}