Question

我想这样做但不知道如何在JavaScript中执行此操作。

if (Email == "*aol.com" || Email == "*hotmail*" || Email == "*gmail*" || Email == "*yahoo*") 
    {
     alert("No Hotmail, Gmail, Yahoo or AOL emails are allowed!");  
     return false;
    }

有什么方法吗？

Answer 1

首先，我认为您的搜索过于通用。（例如，如果某人有电子邮件地址，“ shotmail@mydomain.com ”该怎么办？

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，为什么禁止人们使用这些电子邮件地址？（出于兴趣）

另外，这真的应该在服务器端完成（我假设你没有使用SSJS）

Answer 2

使用JavaScript REGEXP对象。有关示例，请阅读W3schools page或their tutorial。如果您遇到任何问题，请在此处发布，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")
}

Answer 3

最好的方式是REGEXP。快速简单的事情可能是indexOf方法，但它是如此有限。

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

Answer 4

只是因为人们建议使用正则表达式，你也可以以编程方式进行：

（我有点建议你不了解JavaScript）

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;
        }
    }
}

希望它能解释自己;）

同样建议，应该在服务器端执行检查作为绝对最小值，否则您将没有安全性。但是，对于可用性，客户端检查也是好的。

有没有Javascript LIKE语句？

4 个答案: