获取关联数组键列表 [英] Getting a list of associative array keys
问题描述
我在Javascript中有一个关联数组:
I have an associative array in Javascript:
var dictionary = {
"cats": [1,2,3,4,5],
"dogs": [6,7,8,9,10]
};
如何获得此词典的密钥?即我想要
How do I get this dictionary's keys? i.e. I want
var keys = ["cats", "dogs"];
编辑7年后:只是为了得到术语正确 - 在Javascript中没有关联数组这样的东西 - 这在技术上只是一个对象
,它是我们想要的对象键。
Edit 7 years later: Just to get the terminology correct - there is no such thing as an 'associative array' in Javascript - this is technically just an object
and it is the object keys we want.
推荐答案
您可以使用: Object.keys(obj)
示例:
var dictionary = {
"cats": [1, 2, 37, 38, 40, 32, 33, 35, 39, 36],
"dogs": [4, 5, 6, 3, 2]
};
// Get the keys
var keys = Object.keys(dictionary);
console.log(keys);
有关浏览器支持,请参阅下面的参考。 Firefox 4.20,Chrome 5,IE9支持它。如果您的浏览器不支持 Object.keys()
,则下面的链接包含您可以添加的代码段。
See reference below for browser support. It is supported in Firefox 4.20, Chrome 5, IE9. The link below contains a code snippet that you can add if Object.keys()
is not supported in your browser.
https://developer.mozilla.org/en/JavaScript/参考/ Global_Objects /对象/键
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