在 JSON 数组中按属性查找对象

我在获取 JSON 数据中的字符串时遇到问题。格式如下：

[
  {
    "name": "Alice",
    "age": "20"
  },
  {
    "id": "David",
    "last": "25"
  },
  {
    "id": "John",
    "last": "30"
  }
]

有时它会一起改变位置，John从第三名到第二名：

[
  {
    "name": "Alice",
    "age": "20"
  },
  {
    "name": "John",
    "age": "30"
  },
  {
    "name": "David",
    "age": "25"
  }
]

如果我使用data[3].age to get John的年龄，并且数据改变位置，我会得到David's age.

有什么方法可以用来查找对象name David并得到age value?

您可以使用array.find() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find方法为，

var myArray = [
  {
    "name": "Alice",
    "age": "20"
  },
  {
    "name": "John",
    "age": "30"
  },
  {
    "name": "David",
    "age": "25"
  }
];

//Here you are passing the parameter name and getting the age 
//Find will get you the first matching object
var result = myArray.find(t=>t.name ==='John').age;
console.log(result);