在 JavaScript 中按值搜索对象

javascriptweb developmentobject oriented programming更新于 2025/10/24 19:24:17

假设我们有一个像这样的对象 −

const obj = {
   "name": "Vivek Sharma",
   "occupation": "Software Engineer",
   "age": 23,
   "contacts": [{
      "name": "Mukul Sharma",
      "occupation": "Software Engineer",
      "age": 31,
   }, {
      "name": "Jay Sharma",
      "occupation": "Software Engineer",
      "age": 27,
   }, {
      "name": "Rajan Sharma",
      "occupation": "Software Engineer",
      "age": 32,
   }]
};

这里只嵌套了一层，但嵌套也可以更深。我们需要编写一个 Object 函数 Object.prototype.keysOf()，该函数接受一个值并返回一个数组，其中包含所有具有参数中指定值的键。

现在让我们为这个函数编写代码 −

示例

const obj = {
   "name": "Vivek Sharma",
   "occupation": "Software Engineer",
   "age": 23,
   "contacts": [{
      "name": "Mukul Sharma",
      "occupation": "Software Engineer",
      "age": 31,
   }, {
      "name": "Jay Sharma",
      "occupation": "Software Engineer",
      "age": 27,
   }, {
         "name": "Rajan Sharma",
         "occupation": "Software Engineer",
         "age": 32,
      }]
   };
   const keysOf = function(val, obj = this, res = []){
      const keys = Object.keys(obj);
      for(let ind = 0; ind < keys.length; ind++){
         if(obj[keys[ind]] === val){
            res.push(keys[ind]);
         }else if(typeof obj[keys[ind]] === 'object' &&
         !Array.isArray(obj[keys[ind]])){
            keysOf(val, obj[keys[ind]], res);
      };
   };
   return res;
};
Object.prototype.keysOf = keysOf;
console.log(obj.keysOf(23));