检查JS对象中是否存在密钥 [英] Checking if a key exists in a JS object

问题描述

我有以下JavaScript对象:

I have the following JavaScript object:

var obj = {
    "key1" : val,
    "key2" : val,
    "key3" : val
}

有没有办法像这样检查数组中是否存在键?

Is there a way to check if a key exists in the array, similar to this?

testArray = jQuery.inArray("key1", obj);

不起作用.

我必须像这样遍历obj吗?

Do I have to iterate through the obj like this?

jQuery.each(obj, function(key,val)){}

推荐答案

使用 in运算符:

testArray = 'key1' in obj;

---

旁注:到那里，实际上没有jQuery对象，而只是一个普通的JavaScript对象.

---

Sidenote: What you got there, is actually no jQuery object, but just a plain JavaScript Object.

这篇关于检查JS对象中是否存在密钥的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！