如果你想过滤，那么使用.filter-只需检查myFavoriteSport属性是否为soccer：

const input = {
  "JSON": [
    {
      "mySchool": "college",
      "myHome": "apartment",
      "myFavoriteSport": "soccer"
    },
    {
      "mySchool": "highschool",
      "myHome": "house",
      "myFavoriteSport": "hockey"
    },
    {
      "mySchool": "college",
      "myHome": "box",
      "myFavoriteSport": "soccer"
    },
    {
      "mySchool": "elementary",
      "myHome": "tent",
      "myFavoriteSport": "soccer"
    }
  ]
};
console.log(
  input.JSON.filter(({ myFavoriteSport }) => myFavoriteSport === 'soccer')
);

字符串
还要注意，JSON是一种以字符串格式表示对象的方式。（例如，

const myJSON = '[{"foo":"bar"},{"baz":"buzz"}]';

型
）。如果你有实际的对象/数组，那么它不是JSON格式的-它只是一个普通的对象。最好将键命名为arr或personArr或类似的东西。There's no such thing as a "JSON Object"

用filter()数组方法很容易实现，有一个一行的解决方案：你可以在回调函数中指定一个条件，最后你会得到一个新的元素数组，它符合这个条件。

const JSON = [
  {
    "mySchool": "college",
    "myHome": "apartment",
    "myFavoriteSport": "soccer"
  },
  {
    "mySchool": "highschool",
    "myHome": "house",
    "myFavoriteSport": "hockey"
  },
  {
    "mySchool": "college",
    "myHome": "box",
    "myFavoriteSport": "soccer"
  },
  {
    "mySchool": "elementary",
    "myHome": "tent",
    "myFavoriteSport": "soccer"
  }
];

const result = JSON.filter(item => item.myFavoriteSport === 'soccer');
console.log(result);

字符串
您也可以使用许多其他数组迭代方法来实现这样的结果，但filter完全符合您的需求。