Question

我正在尝试创建一个封装我们所有javascript类的命名空间，但是在 POI.prototype.getFullAddress 和 >行（POI后停止）。第二个问题是当我尝试初始化对象 var x = new Makani.POI（a，b，c ...）我得到javascript错误并且必须使用 var x = Makani没有新关键字的.POI（a，b，c ...）很奇怪。我发布了完整的代码供参考。谢谢你的帮助。

/* Makani Javascript Libraries */ var Makani = function () { var private_var; function private_method() { // do stuff here } return { POI: function(ID, Title, Section, District, City, Governorate) { this.ID = ID; this.Title = Title; this.Section = Section; this.City = City; this.Goverorate = Governorate; }, POI.prototype.getFullAddress = function (opts) { if (("includeCity" in opts) && (opts["includeCity"] == false)) return this.Section + ", " + this.District; else if (("includeGovernorate" in opts) && (opts["includeGovernorate"] == false)) return this.Section + ", " + this.District + ", " + this.City; else return this.Section + ", " + this.District + ", " + this.City + ", " + this.Governorate; } }; } ();

Answer 1

可能你只想要这个：

POI.getFullAddress: function (opts) {

看起来您正在尝试更改原型，但是您正在该特定块中创建对象定义。另一种方法是将return部分创建为var，然后扩展原型，然后返回它。

你在简单的层面上做的是：

x = {
  name1: value,
  name2 = value
}

这是无效的语法。

Answer 2

JS中的object initialiser（对象文字）如下所示：

{
    propName: 123,
    123: 'some value',
    hmmAFunction: function(){}
}

通常情况下，每个键/值对用逗号分隔PropertyName : AssignmentExpression。所以，当你这样做时：

return {

    POI: function(ID, Title, Section, District, City, Governorate) {

    },

    // THIS
    POI.prototype.getFullAddress = function (opts) {

    }

};

...它无效，会导致错误抛出。

请改为尝试：

var Makani = {
    POI: (function(){

        function POI (ID, Title, Section, District, City, Governorate) {
            this.ID = ID;
            this.Title = Title;
            this.Section = Section;
            this.City = City;
            this.Goverorate = Governorate;
        }

        POI.prototype.getFullAddress = function (opts) {

            if (("includeCity" in opts) && (opts["includeCity"] == false))
                return this.Section + ", " + this.District;
            else if (("includeGovernorate" in opts) && (opts["includeGovernorate"] == false))
                return this.Section + ", " + this.District + ", " + this.City; 
            else return this.Section + ", " + this.District + ", " + this.City + ", " + this.Governorate;
        };

        return POI;

    }())
};

另外，我建议不要使用大写字母（例如District）来启动变量名称，除非它引用的是构造函数（如POI）。

适用于IE / Firefox / Chrome的Javascript命名空间

2 个答案: