如何计算JSON数组元素的长度 [英] how to count length of the JSON array element

问题描述

我正在尝试计算JSON数组元素的长度。我知道使用 json.array.length 来计算数组的长度。这需要找到每个索引中有多少项。

I'm trying to count the length of the JSON array element. I know to count the length of array using json.array.length. That is need to find that how many items in every index.

如果我的数组是：

  {"shareInfo":[{"id":"1","a":"sss","b":"sss","question":"whi?"},
  {"id":"2","a":"sss","b":"sss","question":"whi?"},
  {"id":"3","a":"sss","b":"sss","question":"whi?"},
  {"id":"4","a":"sss","b":"sss","question":"whi?"}]}

然后我需要找的长度{id：1，a：sss，b：sss，问题：whi？} 。在这有四个项目。我用 data.shareInfo [i] .length 尝试了这个。但它会产生错误。

Then I need to find the length of {"id":"1","a":"sss","b":"sss","question":"whi?"}. In this there have four items. I tried this with data.shareInfo[i].length. But it produces error.

请有人告诉我如何找到长度....谢谢....

Please anyone tell me how to find the length.... Thanks....

推荐答案

在开始回答之前，请先阅读文档一次。然后你清楚地理解答案。

Before going to answer read this Documentation once. Then you clearly understand the answer.

试试这可能对你有用。

Object.keys(data.shareInfo[i]).length

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