通过JavaScript对象的所有实例循环

问题描述

如果我有一个对象的构造函数，如：

if I have an object constructor like:

function cat(color, sex){
     this.color = color;
     this.sex = sex;
}

和我做一些猫：

var fluffball = new cat("blue","male");
var shiznitz = new cat("red","male");
var slothersburger = new cat("green","female");

是否有可能通过所有的猫环路我宣布？是这样的：

Is it possible to loop through all the cats I have declared? Something like:

var current_cat;
for(current_cat in document.cat){
     alert(current_cat.color);
}

这不，虽然工作。难道人们通常存储在一个阵列中的所有猫对象？或使含个体猫的数组另一个对象：

That doesn't work though. Do people usually store all the cat objects in an array? Or make another object containing an array of the individual cats:

function all_cats(){
     this.the_cats = new Array();
}

感谢您的任何提示！

Thanks for any tips!

推荐答案

这是不可能通过你所创建的所有对象的循环，除非你一直跟踪它们的地方（如在构造）。事情是这样的 -

It is not possible to loop through all the objects you have created unless you kept track of them somewhere (like in the constructor). Something like this-

var globalCatArray = [];

function cat(color, sex){
    this.color = color;
    this.sex = sex;
    globalCatArray.push(this);
}

var fluffball = new cat("blue","male");
var shiznitz = new cat("red","male");
var slothersburger = new cat("green","female");

//use globalCatArray to get all instances

当心虽然。只要对象是在数组中，他们留在内存中没有垃圾收集。所以，如果你创建了很多对象，你可能想从数组中删除他们，一旦你用它做。

Watch out though. As long as the objects are in the array, they stay in memory without garbage collected. So if you create a lot of objects, you may want to remove them from the array once you are done with it.

另外，不要使用的for..in 来迭代虽然循环。看到这个http://stackoverflow.com/questions/1234449/javascript-array-extension/1234482

Also, do not use for..in to iterate though loops. See this http://stackoverflow.com/questions/1234449/javascript-array-extension/1234482

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