如何列出JavaScript对象的属性？ [英] How to list the properties of a JavaScript object?

问题描述

假设我创建了一个对象：

Say I create an object thus:

var myObject =
        {"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"};

检索属性名称列表的最佳方法是什么？即我想最终得到一些变量'键'，以便：

What is the best way to retrieve a list of the property names? i.e. I would like to end up with some variable 'keys' such that:

keys == ["ircEvent", "method", "regex"]

推荐答案

在现代浏览器中（IE9 + ，FF4 +，Chrome5 +，Opera12 +，Safari5 +）您可以使用内置的对象。键方法：

In modern browsers (IE9+, FF4+, Chrome5+, Opera12+, Safari5+) you can use the built in Object.keys method:

var keys = Object.keys(myObject);

上面有一个完整的polyfill，但简化版是：

The above has a full polyfill but a simplified version is:

var getKeys = function(obj){
   var keys = [];
   for(var key in obj){
      keys.push(key);
   }
   return keys;
}

或者替换 var getKeys 使用 Object.prototype.keys ，允许您在任何对象上调用 .keys（）。扩展原型有一些副作用，我不建议这样做。

Alternatively replace var getKeys with Object.prototype.keys to allow you to call .keys() on any object. Extending the prototype has some side effects and I wouldn't recommend doing it.

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