使用Javascript检查JSON对象是否包含值

Use Javascript to check if JSON object contain value

本文关键字：是否 包含值 对象 JSON Javascript 检查 使用      更新时间：2023-09-26

我想检查JSON对象中的某个键是否包含某个值。假设我想要检查键"name"在任何对象中的值是否为"Blofeld"(为真)。我该怎么做呢?

[ {
  "id" : 19,
  "cost" : 400,
  "name" : "Arkansas",
  "height" : 198,
  "weight" : 35 
}, {
  "id" : 21,
  "cost" : 250,
  "name" : "Blofeld",
  "height" : 216,
  "weight" : 54 
}, {
  "id" : 38,
  "cost" : 450,
  "name" : "Gollum",
  "height" : 147,
  "weight" : 22 
} ]

您也可以使用Array.some()函数:

const arr = [
  {
    id: 19,
    cost: 400,
    name: 'Arkansas',
    height: 198,
    weight: 35 
  }, 
  {
    id: 21,
    cost: 250,
    name: 'Blofeld',
    height: 216,
    weight: 54 
  }, 
  {
    id: 38,
    cost: 450,
    name: 'Gollum',
    height: 147,
    weight: 22 
  }
];
console.log(arr.some(item => item.name === 'Blofeld'));
console.log(arr.some(item => item.name === 'Blofeld2'));
// search for object using lodash
const objToFind1 = {
  id: 21,
  cost: 250,
  name: 'Blofeld',
  height: 216,
  weight: 54 
};
const objToFind2 = {
  id: 211,
  cost: 250,
  name: 'Blofeld',
  height: 216,
  weight: 54 
};
console.log(arr.some(item => _.isEqual(item, objToFind1)));
console.log(arr.some(item => _.isEqual(item, objToFind2)));
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.11/lodash.min.js"></script>

这将给你一个数组，其中的元素与name === "Blofeld"匹配:

var data = [ {
  "id" : 19,
  "cost" : 400,
  "name" : "Arkansas",
  "height" : 198,
  "weight" : 35
}, {
  "id" : 21,
  "cost" : 250,
  "name" : "Blofeld",
  "height" : 216,
  "weight" : 54
}, {
  "id" : 38,
  "cost" : 450,
  "name" : "Gollum",
  "height" : 147,
  "weight" : 22
} ];
var result = data.filter(x => x.name === "Blofeld");
console.log(result);

编写一个简单的函数来检查对象数组是否包含特定的值

var arr = [{
  "name": "Blofeld",
  "weight": 54
}, {
  "name": "",
  "weight": 22
}];
function contains(arr, key, val) {
  for (var i = 0; i < arr.length; i++) {
    if (arr[i][key] === val) return true;
  }
  return false;
}
console.log(contains(arr, "name", "Blofeld")); //true
console.log(contains(arr, "weight", 22)); //true
console.log(contains(arr, "weight", "22")); //false (or true if you change === to ==)
console.log(contains(arr, "name", "Me")); //false

使用hasOwnProperty()对数组中的所有对象进行简单的循环:

var json = [...];
var wantedKey = ''; // your key here
var wantedVal = ''; // your value here
for(var i = 0; i < json.length; i++){
   if(json[i].hasOwnProperty(wantedKey) && json[i][wantedKey] === wantedVal) {
     // it happened.
     break;
   }
}
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