javascript-检查对象是否为空 [英] javascript - check if object is empty

问题描述

我正在尝试通过javascript/jquery测试创建一个对象，以检查我的对象是否为空并且无法弄清楚.

I am trying to create to javascript/jquery test to check if my object is empty and cannot figure it out.

这里是其中包含某些东西的对象:

Here is the object when it has something in it:

{"mergedSellerArray":{"key1114":"1120"}}

这是空的对象:

{"mergedSellerArray":{}}

这是我根据另一个SO答案进行的当前测试，但它不起作用:

This is the current test I have based on another SO answer but it does not work:

var sellers = JSON.stringify({mergedSellerArray});
if(Object.keys(sellers).length === 0 && sellers.constructor === Object) {
    console.log("sellers is empty!");
}

推荐答案

您正在测试的sellers不能为空，因为它包含mergedSellerArray.您需要测试sellers.mergedSellerArray

You were testing sellers which is not empty because it contains mergedSellerArray. You need to test sellers.mergedSellerArray

let sellers = {
  "mergedSellerArray": {}
};
if (Object.keys(sellers.mergedSellerArray).length === 0 && sellers.mergedSellerArray.constructor === Object) {
  console.log("sellers is empty!");
} else {
  console.log("sellers is not empty !");
}

这篇关于javascript-检查对象是否为空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！