javascript - 将对象数组转换为数组

Question

我正在尝试将测试数组中每个对象的“count”键转换为一个新数组，所以我最终得到类似

新计数 =[0,0,0,0]

const test =  [
      {
        id: 0,
        count: 0,
        image: "",
        text: 'Some text about finn'
      },
      {
        id: 1,
        count: 0,
        image: "",
        text: 'Some text about daphne'
      },
      {
        id: 2,
        count: 0,
        image: "",
        text: 'Some text  finn'
      },
      {
        id: 3,
        count: 0,
        image: "",
        text: 'Some text  daphne'
      }
    ]

Answer 1

You can use Array.prototype.map() on your test array to extract the count property value of each object:

const newCount = test.map(t => t.count);

Hopefully that helps!

Answer 2

您可以在数组上使用地图：

const newarray = test.map(item => item.count);

数组映射文档