Javascript 正在尝试解决jquery异步问题

我对javascript非常陌生，我正在尝试使用mailgun的电子邮件验证功能，并且我正在尝试使验证工作正常（通过确保在提交表单之前电子邮件数据是完整的）

但是我发现函数validation_success总是异步调用的，结果如下：

checks start!
Feedback:390 checks complete! ErrorEmail=2
Feedback:347 execution begin
Feedback:404 validation begin! ErrorEmail=2
Feedback:419 validation complete! ErrorEmail=2

        var ErrorEmail = -1;
        $(function () {

            $('#User_Email').mailgun_validator({
                api_key: 'x',
                in_progress: validation_in_progress, // called when request is made to validator
                success: validation_success,         // called when validator has returned
                error: validation_error,           // called when an error reaching the validator has occured
            });

            $("#FeedbackForm").submit(function (event) {
                if($("#User_Email").val())
                {
                    check().done(function(){
                        console.log('execution begin');
                            if (ErrorEmail == 2) {
                            if (confirm('Are you sure this is the email you want to use?')) {
                                $(form).submit();
                            }
                        }
                        else if (ErrorEmail == 0)
                        {
                            $(form).submit();
                        }
                    });

                    event.preventDefault();
                }
                else
                {
                    console.log('no email');
                    event.preventDefault();
                }
            });
        });

        function check(callback) {
            var dfrd1 = $.Deferred();
            console.log('checks start!');
            dfrd1.resolve(
                $('#User_Email').mailgun_validator({
                    api_key: 'x',
                    in_progress: validation_in_progress, // called when request is made to validator
                    success: validation_success,         // called when validator has returned
                    error: validation_error,           // called when an error reaching the validator has occured
                }).done()
            );

            console.log('checks complete! ErrorEmail='+ErrorEmail);
            return dfrd1.done().promise();
        }

        // while the lookup is performing
        function validation_in_progress() {
            $('#status').html("<img src=@Url.Content(@"~/Assets/img/loading.gif") height='16'/>");
        }

        // if email successfully validated
        function validation_success(data) {
            //var dfrd1 = $.Deferred();
            //dfrd1.resolve(data);

            console.log('validation begin! ErrorEmail=' + ErrorEmail);
            $('#status').html(get_suggestion_str(data['is_valid'], data['did_you_mean']));

            if (data['is_valid'] && !data['did_you_mean']) {
                ErrorEmail = 0;
            }
            else if (data['is_valid'] && data['did_you_mean']) {
                ErrorEmail = 2;
            }
            else
                ErrorEmail = 1;
            console.log('validation complete! ErrorEmail=' + ErrorEmail);

            //return dfrd1.promise();
        }

        // if email is invalid
        function validation_error(error_message) {
            $('#status').html(error_message);
        }

        // suggest a valid email
        function get_suggestion_str(is_valid, alternate) {
            if (is_valid) {
                ErrorEmail = 0;
                var result = '<span class="success">Address is valid.</span>';
                if (alternate) {
                    result += '<span class="warning"> (Though did you mean <em>' + alternate + '</em>?)</span>';
                    ErrorEmail = 2;
                }
                return result
            } else if (alternate) {
                ErrorEmail = 1;
                return '<span class="warning">Did you mean <em>' + alternate + '</em>?</span>';
            } else {
                ErrorEmail = 1;
                return '<span class="error">Email address is invalid. Please try another.</span>';
            }
        }

我希望序列如下所示：

checks start!
validation begin! ErrorEmail=2        //this will update the ErrorEmail var.
validation complete! ErrorEmail=2
checks complete! ErrorEmail=2
execution begin

我已经搜索并尝试了所有技术（异步假/延迟/回调），但我似乎无法找出可能出现的错误

我的代码如下：

checks start!
Feedback:390 checks complete! ErrorEmail=2
Feedback:347 execution begin
Feedback:404 validation begin! ErrorEmail=2
Feedback:419 validation complete! ErrorEmail=2

        var ErrorEmail = -1;
        $(function () {

            $('#User_Email').mailgun_validator({
                api_key: 'x',
                in_progress: validation_in_progress, // called when request is made to validator
                success: validation_success,         // called when validator has returned
                error: validation_error,           // called when an error reaching the validator has occured
            });

            $("#FeedbackForm").submit(function (event) {
                if($("#User_Email").val())
                {
                    check().done(function(){
                        console.log('execution begin');
                            if (ErrorEmail == 2) {
                            if (confirm('Are you sure this is the email you want to use?')) {
                                $(form).submit();
                            }
                        }
                        else if (ErrorEmail == 0)
                        {
                            $(form).submit();
                        }
                    });

                    event.preventDefault();
                }
                else
                {
                    console.log('no email');
                    event.preventDefault();
                }
            });
        });

        function check(callback) {
            var dfrd1 = $.Deferred();
            console.log('checks start!');
            dfrd1.resolve(
                $('#User_Email').mailgun_validator({
                    api_key: 'x',
                    in_progress: validation_in_progress, // called when request is made to validator
                    success: validation_success,         // called when validator has returned
                    error: validation_error,           // called when an error reaching the validator has occured
                }).done()
            );

            console.log('checks complete! ErrorEmail='+ErrorEmail);
            return dfrd1.done().promise();
        }

        // while the lookup is performing
        function validation_in_progress() {
            $('#status').html("<img src=@Url.Content(@"~/Assets/img/loading.gif") height='16'/>");
        }

        // if email successfully validated
        function validation_success(data) {
            //var dfrd1 = $.Deferred();
            //dfrd1.resolve(data);

            console.log('validation begin! ErrorEmail=' + ErrorEmail);
            $('#status').html(get_suggestion_str(data['is_valid'], data['did_you_mean']));

            if (data['is_valid'] && !data['did_you_mean']) {
                ErrorEmail = 0;
            }
            else if (data['is_valid'] && data['did_you_mean']) {
                ErrorEmail = 2;
            }
            else
                ErrorEmail = 1;
            console.log('validation complete! ErrorEmail=' + ErrorEmail);

            //return dfrd1.promise();
        }

        // if email is invalid
        function validation_error(error_message) {
            $('#status').html(error_message);
        }

        // suggest a valid email
        function get_suggestion_str(is_valid, alternate) {
            if (is_valid) {
                ErrorEmail = 0;
                var result = '<span class="success">Address is valid.</span>';
                if (alternate) {
                    result += '<span class="warning"> (Though did you mean <em>' + alternate + '</em>?)</span>';
                    ErrorEmail = 2;
                }
                return result
            } else if (alternate) {
                ErrorEmail = 1;
                return '<span class="warning">Did you mean <em>' + alternate + '</em>?</span>';
            } else {
                ErrorEmail = 1;
                return '<span class="error">Email address is invalid. Please try another.</span>';
            }
        }

var ErrorEmail=-1；
$（函数（）{
$（“#用户_电子邮件”）.mailgun_验证程序({
api_键：“x”，
in_progress:validation_in_progress，//在向验证器发出请求时调用
success:validation\u success，//在验证程序返回时调用
错误：validation\u error，//发生到达验证程序的错误时调用
});
$（“#反馈表单”）.submit（函数（事件）{
if（$（“#用户电子邮件”）.val（）
{
check（）.done（函数（））{
log（'executionbegin'）；
如果（ErrorEmail==2）{
如果（确认（'您确定这是您要使用的电子邮件吗？'））{
$（表单）.submit（）；
}
}
else if（ErrorEmail==0）
{
$（表单）.submit（）；
}
});
event.preventDefault（）；
}
其他的
{
console.log（“无电子邮件”）；
event.preventDefault（）；
}
});
});
函数检查（回调）{
var dfrd1=$.Deferred（）；
log（'checks start！'）；
解析(
$（“#用户_电子邮件”）.mailgun_验证程序({
api_键：“x”，
in_progress:validation_in_progress，//在向验证器发出请求时调用
success:validation\u success，//在验证程序返回时调用
错误：validation\u error，//发生到达验证程序的错误时调用
}).完成
);
log（'检查完成！ErrorEmail='+ErrorEmail'）；
返回dfrd1.done（）.promise（）；
}
//在执行查找时
功能验证正在进行中（）{
$（'#status'）.html（“”）；
}
//如果电子邮件成功验证
功能验证成功（数据）{
//var dfrd1=$.Deferred（）；
//解析（数据）；
log（'validation begin！ErrorEmail='+ErrorEmail'）；
$（'status'）.html（获取建议（数据['is'u valid']，数据['did'u you'u mean']）；
如果（数据['is_valid']&&！数据['dod_you_意指]）{
ErrorEmail=0；
}
else if（数据['is_valid']&&data['dod_you_意指]）{
ErrorEmail=2；
}
其他的
ErrorEmail=1；
log（'validation complete！ErrorEmail='+ErrorEmail'）；
//返回dfrd1.promise（）；
}
//如果电子邮件无效
功能验证错误（错误消息）{
$（'#status'）.html（错误消息）；
}
//建议一封有效的电子邮件
函数get\u suggestion\u str（是否有效，可选）{
如果（是否有效）{
ErrorEmail=0；
var result='地址有效'；
如果（备选）{
结果+='（虽然你的意思是“+alternate+”？）；
ErrorEmail=2；
}
返回结果
}否则，如果（备用）{
ErrorEmail=1；
return“您是指“+alternate+”？”；
}否则{
ErrorEmail=1；
return“电子邮件地址无效。请尝试其他地址。”；
}
}

check（）

函数已经有了一个

延迟的
对象（
$（'User\u Email'）.mailgun\u validator
）唯一要做的事情就是
。管道
该函数的结果并调用
解析
dfrdl
函数，最后只返回dfrdl如下：

function check(callback) {
    var dfrd1 = $.Deferred();
    console.log('checks start!');
    $('#User_Email').mailgun_validator({
            api_key: 'x',
            in_progress: validation_in_progress, // called when request is made to validator
            success: validation_success,         // called when validator has returned
            error: validation_error,           // called when an error reaching the validator has occured
        }).pipe(function(res){
            dfrd1.resolve(res);
        })

    console.log('checks complete! ErrorEmail='+ErrorEmail);
    return dfrd1;
}

check（）
函数已经有了一个
延迟的
对象（
$（'User\u Email'）.mailgun\u validator
）唯一要做的就是
。管道
该函数的结果并调用
解析
dfrdl
函数，最后只返回dfrdl如下：

function check(callback) {
    var dfrd1 = $.Deferred();
    console.log('checks start!');
    $('#User_Email').mailgun_validator({
            api_key: 'x',
            in_progress: validation_in_progress, // called when request is made to validator
            success: validation_success,         // called when validator has returned
            error: validation_error,           // called when an error reaching the validator has occured
        }).pipe(function(res){
            dfrd1.resolve(res);
        })

    console.log('checks complete! ErrorEmail='+ErrorEmail);
    return dfrd1;
}

您遇到了什么错误？嘿@Amy，我希望顺序如下（确保在执行表单之前先验证电子邮件）：检查开始！验证开始！ErrorEmail=2验证完成！ErrorEmail=2检查完成！ErrorEmail=2执行开始如果您希望事情按顺序运行，则需要将事情放入回调函数中-例如，您的检查完成应放入邮枪的完成中validator@Pete你介意举个例子吗？谢谢！上厕所k在你的check.done函数上面你得到了什么错误？嘿@Amy，我希望序列如下（确保在执行表单之前先验证电子邮件）：检查开始！验证开始！ErrorEmail=2验证完成！ErrorEmail=2检查完成！ErrorEmail=2执行开始如果您希望事情按顺序运行，则需要将事情放入回调函数中-例如，您的检查完成应放入邮枪的完成中validator@Pete你介意举个例子吗？谢谢！上厕所在你的支票上签字