javascript - 如果 JSON 和 Array 中存在相同的值，请执行某些操作

Question

我对逻辑有一个粗略的了解，但如果有人可以提供帮助，非常感谢!

尝试查看 JSON(来自 URL)和数组中是否有任何数字匹配。如果确实如此，那就做点什么吧。在此示例中，300 是 JSON 和数组中都存在的数字。

可能的逻辑/代码

// FOR json
for(var i = 0; i < obj.length; i++) {
    var myObjNum = obj[i];
}

// FOR myArray
for(var i = 0; i < myArray.length; i++) {
    var myArrayNum = myArray[i];
}

// if cat ID is in the DOM and array, do something
if (myObjNum == myArrayNum) {
   // if a number is found in both the array and JSON, do something here
}

JSON (https://api.myjson.com/bins/svr3i)

[
   {

   "5774": {
      "subCats": [
      {
         "town": "atlanta",
         "state": "georgia"
      }
      ]
   },
   "300": {
      "subCats": [
      {
         "town": "new york city",
         "state": "new york"
      }
      ]
   },
   "899": {
      "subCats": [
      {
         "town": "san diego",
         "state": "california"
      }
      ]
   },
   "2557": {
      "subCats": [
      {
         "town": "chicago",
         "state": "illinois"
      }
      ]
   }

  }
]

数组

var myArray = [500,4743,300,77899];

Answer 1

只需使用嵌套循环

var JSON = [
   {

   "5774": {
      "subCats": [
      {
         "town": "atlanta",
         "state": "georgia"
      }
      ]
   },
   "300": {
      "subCats": [
      {
         "town": "new york city",
         "state": "new york"
      }
      ]
   },
   "899": {
      "subCats": [
      {
         "town": "san diego",
         "state": "california"
      }
      ]
   },
   "2557": {
      "subCats": [
      {
         "town": "chicago",
         "state": "illinois"
      }
      ]
   }

  }
]


var myArray = [500,4743,300,77899];

Object.keys(JSON[0]).forEach(key => {
      myArray.forEach(item => {
           if(item == key){
             // do something here
             console.log('action');
           }
      });
    });