jQuery函数在回调时返回undefined [英] jQuery function returns undefined on callback

问题描述

我整理了一个使用干净框架的小javascript文件，格式如下:

I've put together a little javascript file which uses a clean framework, here's how it's formatted:

var functionLibrary = {

    validateFields:function(inputArray, result) {
        $.each(inputArray, function(index, listItem) {
            if (!$.trim($("#" + listItem).val()).length) {
                return "empty";
            }   
        });
    }

}

这是我将数据传递给此类函数并在验证响应时获得undefined的原因:

Here's me passing data to such function and getting an undefined when validating the response:

var Validation = functionLibrary.validateFields(['amount', 'ppemail']);
console.log(Validation);

为什么该函数应在返回empty时在控制台日志中显示undefined?

Why does such function show undefined in the console log when it should be returning empty ?

推荐答案

您没有从validateFields方法返回任何内容...

You are not returning anything from the validateFields method...

var functionLibrary = {

    validateFields: function (inputArray, result) {
        var value;
        $.each(inputArray, function (index, listItem) {
            if (!$.trim($("#" + listItem).val()).length) {
                //set the validity status
                value = "empty";
                //stop further execution of the loop
                return false;
            }
        });
        //return the value from validateFields
        return value;
    }

}

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