循环浏览javascript中的“函数”对象

Question

我有一个项目，我想将一个“功能”对象（与JSON对象-对象文字相反）与现有对象合并。 我想获取“公开可见”属性。 但是，当我进行for in循环时，它们不显示。 它们不会触发内部的console.log() 。 我如何获得它们？

//obj passed to extend() by external caller
//this is what obj it looked like when i console.log()'ed it
obj = function() {

    //skip these private ones
    var imPrivate = 'i should not be included';
    function imGetter() {}

    //i want these guys below:
    this.getter = imGetter;
    this.imPublic = "i should be included";

}

function extend(obj){
    console.log('i can see here');

    for (var key in obj) {
        console.log('you cannot see here');
    }​

    //...more of our code here
}

Answer 1

在调用函数之前，这些属性不存在。

一旦你var foo = new obj(); 然后您将看到属性 （在foo ）。

或者，移动设置属性的代码，使其位于函数外部 。

Answer 2

您可以使其自行执行：

var obj={};
(function(ns) { //skip these private ones   
    var imPrivate = 'i should not be included';

    function imGetter() {};
    //i want these guys below:  
    ns.getter = imGetter;
    ns.imPublic = "i should be included";
})(obj)
console.log('i can see here');
for (var key in obj) {
    console.log('you cannot see here '+key+" holds:"+obj[key]);
}