1、前端JS代码

/*      receiver-----接收人   */

function foreachEmail(receiver){

        var str="";

        var email ="";

        if(receiver!="" && receiver.indexOf(";")>0)

        {

            var arremail=receiver.split(";");

            for(var i=0;i <arremail.length;i++)

            {

                if(arremail[i].replace(/\s+/g,"").search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/)==-1)

                {

                    str=str+arremail[i]+"格式错误!\n";

                }else{

                    if(i > 0){

                        if(arremail[i] != arremail[i-1]){

                            email = email+";"+arremail[i];

                        }

                    }else{

                        email = arremail[i];

                    }

                }

            }

            receiver = email;

        }else{

            if(receiver.replace(/\s+/g,"").search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/)==-1)

            {

                str=receiver+"格式错误!\n";

            }

        }

        if(str!="")

        {

            $("#alertmsg").html(str);

            return false;

        }

        return receiver;

    }

//当文本框失去焦点时，判断是否输入重复的邮箱输入的话就不显示重复的邮箱

$("#receiver").blur(function(){

        var email = foreachEmail($("#receiver").val().replace(/(^\s*)|(\s*$)/g,''));

        if(email == false){

            $("#receiver").val("");

        }else{

            $("#receiver").val(email);

        }

 });

function sendEmail(){

    receiver = $("#receiver").val();

    receiver  = foreachEmail(receiver);

    if(receiver   == false){

        return false;

    }

    $.ajax({

        ...                                                                                     //此处略去发送的代码

    });

}

2、后台PHP代码

    可以用explode()方法把取得的邮件字符串分离，代码就不赘述了！！！