javascript - 嵌套对象内的函数调用失败

Question

在下面的代码中，我想通过构造函数提供通用函数。该对象用于处理对 API 的调用。但如果我从 events.POST 调用 this._isEmpty(obj) 它总是返回 false。放置 _isEmpty() 函数的主体确实给出了所需的结果。我该如何解决这个问题？当然，欢迎任何有关改进此结构的建议。我在 SO 上查找了一些类似的问题，但我发现的问题/答案没有类似的嵌套。

我调用以下电话:

var assystBridge = new global.assystBridge();
response.setStatus(assystBridge.events.POST(request, response));

对象:

var assystBridge = Class.create();
assystBridge.prototype = {
    initialize: function() {
        // Generic functions go here
        function _isEmpty(obj){
            // Checks whether an object has properties
            // Used for checking whether any data was posted or not
            // Returns true or false
            return Object.keys(obj).length === 0;
        }
    },
    events: {
        POST: function(request, response){
            var data = request.body.data;
            var responseText = '';
            if(this._isEmpty(data)){
            //if(Object.keys(data).length === 0){   
                response.setBody({"response":"NO data was posted", "data": data});
                return 400;
            } else {
                return 201;
            }

        },
        GET: function(request, response){

        },
        DELETE: function(request, response){

        }
    },
    type: 'assystBridge'
};

Answer 1

如果将泛型函数移出 initialize() 方法，并将其作为原型(prototype)的属性之一，那么您可以通过 assystBridge.prototype._isEmpty( )。

例如:

assystBridge.prototype = {
    _isEmpty: function(obj) {
        // Checks whether an object has properties
        // Used for checking whether any data was posted or not
        // Returns true or false
        return Object.keys(obj).length === 0;
    },
    events: {
        POST: function(request, response){
            var data = request.body.data;
            var responseText = '';
            if(assystBridge.prototype._isEmpty(data)){
                response.setBody({"response":"NO data was posted", "data": data});
                return 400;
            } else {
                return 201;
            }

        },
    },
    type: 'assystBridge'
};