无法访问json对象属性返回未定义 [英] cannot access json object property returns undefined

问题描述

我正在从json对象访问密钥，但它返回未定义

I am accessing a key from json object but it returns undefined

{"body":"Hi","date":"2016-07-29 07:43:00"}

var a = JSON.parse(JSON.stringify(r.txt));
console.log(a.body)

//undefined

r的值为

{
  username: '1',
  txt: '{"body":"Hi","date":"2016-07-29 07:43:00"}',
 }

我尝试使用stringify，然后解析为json，但仍然返回undefined.

I have tried using stringify and then parse to json but still return undefined.

推荐答案

您必须像这样解析您的json.确保您要提供给JSON.parse的任何输入都应该是字符串.

You've to parse your json like this. Ensure that your whatever input you're giving to JSON.parse, it should be a string.

您可以运行以下代码段以确保其正常工作并提供输出Hi.

You can run the below snippet to ensure that it's working and giving output Hi.

var json = '{"body":"Hi","date":"2016-07-29 07:43:00"}';

var a = JSON.parse(json);
document.write(a.body);

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