本文介绍了获取键/值javascript对象的键的最佳方法的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

如果我有一个JS对象:

If I have a JS object like:

var foo = { 'bar' : 'baz' }

如果我知道 foo 具有该基本键/值结构,但不知道密钥的名称,最简单的方法是什么? for ... in $。每个()?我希望有更好的东西....

If I know that foo has that basic key/value structure, but don't know the name of the key, what's the easiest way to get it? for ... in? $.each()? I hope there's something better....

推荐答案

如果你想得到所有的钥匙,。这仅适用于较新的浏览器,但提供了替代实现(在 btw中也使用):

If you want to get all keys, ECMAScript 5 introduced Object.keys. This is only supported by newer browsers but the MDC documentation provides an alternative implementation (which also uses for...in btw):

if(!Object.keys) Object.keys = function(o){
     if (o !== Object(o))
          throw new TypeError('Object.keys called on non-object');
     var ret=[],p;
     for(p in o) if(Object.prototype.hasOwnProperty.call(o,p)) ret.push(p);
     return ret;
}

当然,如果你想要,密钥和价值,那么 for ... in 是唯一合理的解决方案。

Of course if you want both, key and value, then for...in is the only reasonable solution.

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09-05 12:02