javascript - 获取键/值javascript对象的键的最佳方法(best way to get the key of a key/value javascript object)

Question

If I have a JS object like:(如果我有一个JS对象，例如：)

var foo = { 'bar' : 'baz' } 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?(如果我知道foo具有基本的键/值结构，但不知道键的名称，那么最简单的方法是什么？) for ... in ?(for ... in ？) $.each() ?($.each()吗？) I hope there's something better....(我希望有更好的...)   ask by sprugman translate from so

Answer 1

You would iterate inside the object with a for loop:(您将使用for循环在对象内部进行迭代：)

for(var i in foo){ alert(i); // alerts key alert(foo[i]); //alerts key's value } Or(要么) Object.keys(foo) .forEach(function eachKey(key) { alert(key); // alerts key alert(foo[key]); // alerts value });