验证以分号分隔的多封电子邮件，并且所有电子邮件都必须与特定域匹配

Question

我想验证这个包含多封电子邮件的文本字段email；全部用分号分隔，但这不起作用。当 msn.com 与其他电子邮件一起输入时，它应该会中断。

var isMsn = ["msn.com"];
function myFunction() {
    var str = email.value;
    //var isMsn = str.includes("msn.com");
    var res = str.split(";");
    var isValid = false;
    //alert(res.length);
    for (var i = 0; i < res.length; i++){
        //alert(res[i]);
        var x = res[i];
        //check to see if this is an valid emAIL then
        var mailformat = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
        if(x.match(mailformat)){
           alert("valid email address!");
           //IF isMsn = TRUE then check to see if is contains msn.com
           if (x.contains(isMsn) ){
               alert("it is MSN");
               //res[+1];
               isValid = true;   
           } 
           else {
               alert('no MSN');
               if (res.includes(isMsn)){
                   //alert('Cannot mix MSN emails with other');
                   //isValid = false;
                   //res[-1];
                   break;
               }
               //else{
               //alert('it is other');
               //isValid = true;
               //}
           }  
       }
       else{
           alert("You have entered an invalid email address!");
           isValid = false;
       } 
   }    
}

我希望它循环通过，并且所有电子邮件必须匹配 msn.com 或其他 NOT Both。例如，user@msn.com;user1@msn.com 或 user@hotmail.com;user1@hotmail.com 但不是 user@msn.com;user1@hotmail.com

不确定 .includes 是否是最佳选择！

Answer 1

1) 你应该使用includes 而不是contains;
2）includes或contains方法接受的是字符串，不是数组，所以应该是res.includes(isMsn[0])；

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes

如果您想通过多个域进行验证 - 您不应将其命名为 isMsn，而应将其命名为 prohibitedDomains，然后通过此数组命名为 Array.some (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some)。

prohibitedDomains.some((domain) => res.includes(domain))