如何搜索以下json数据中的任何项目

Question

如何使用单个forin循环从json数据中搜索任何项目。 我试过搜索一个，但如果我想从任何其他领域搜索该怎么办。 例如，如果我想搜索来自featuredBrands的项目是否存在，并且是否存在则返回该项目。

＆＃13;

＆＃13;

var users = [{
    "userProfile": {
      "firstName": "Rahul",
      "lastName": "Jhawar",
      "cartitemsno": 2,
      "items": ["THINK AND GROW RICH", "Lenovo Z2 Plus"]
    }
  },

  {
    "dayDeals": [{
        "productCategory": "Sports & Fitness Gear",
        "discount": "20-80% off",
        "items": "Yonex,Li-Ning & more"
      },
      {
        "productCategory": "Best Ethnic Trends",
        "discount": "50-80% off",
        "items": "Kurtas,Sarees & more"
      },
      {
        "productCategory": "Popular Brands",
        "discount": "60-80% off",
        "items": "T-shirts,Shirts,Jeans"
      }
    ]
  },
  {
    "featuredBrands": [{
        "brandName": "Ambrane",
        "userRating": 3.7
      },
      {

        "brandName": "Sony",
        "userRating": 4.2

      },
      {
        "brandName": "IPro",
        "userRating": 4.0
      }
    ]
  },
  {

    "recommendedItems": [{
        "itemName": "Stay Hungry Stay Foolish",
        "productCategory": "Books",
        "prouctPrice": "Rs 186",
        "offer": "3%"
      },
      {
        "itemName": "iPro IP 43 20800 mAh Power Bank  (White & Grey, Lithium-ion)",
        "productCategory": "Mobile Accessories",
        "prouctPrice": "Rs 1199",
        "offer": "60%"
      },
      {
        "itemName": "Micromax Canvas Pulse 4G (Grey, 16 GB)  (3 GB RAM)",
        "productCategory": "Mobile Phones",
        "prouctPrice": "Rs 11199",
        "offer": "12%"
      }
    ]

  }
]

var displayitem = function(users, name) {

  for (var item in users) {

    if (users[item].userProfile.firstName == name) {
      return users[item].userProfile.firstName;
    } else {
      return "Item not found"
    }
  }
};

console.log(displayitem(users, "Rahul"));

＆＃13;

＆＃13;

＆＃13;

Answer 1

你需要遍历数组

见我的第二个例子。你的JSON不合逻辑。第0项是userPRofile，然后第1项是dayDeals，第2项是特色品牌。数组中的第3项是recommendedItems，但它们与用户无关

var displayitem = function(users, name) {

  for (var i = 0; i < users.length; i++) {
    var userProfile = users[i].userProfile;
    if (userProfile.firstName == name) {
      return userProfile.items;
    }
  }
  return "Item not found"
};

var displayitem1 = function(users, name) {
  for (var i = 0; i < users.length; i++) {
    var recommendedItems = users[i].recommendedItems;
    if (recommendedItems) {
      for (var j = 0; j < recommendedItems.length; j++) {
        if (recommendedItems[j].itemName == name) {
          return i+"."+j+" name:"+name+" found";
        }
      }
    }
  }
  return false;
};


var users = [{
    "userProfile": {
      "firstName": "Rahul",
      "lastName": "Jhawar",
      "cartitemsno": 2,
      "items": ["THINK AND GROW RICH", "Lenovo Z2 Plus"]
    }
  },

  {
    "dayDeals": [{
        "productCategory": "Sports & Fitness Gear",
        "discount": "20-80% off",
        "items": "Yonex,Li-Ning & more"
      },
      {
        "productCategory": "Best Ethnic Trends",
        "discount": "50-80% off",
        "items": "Kurtas,Sarees & more"
      },
      {
        "productCategory": "Popular Brands",
        "discount": "60-80% off",
        "items": "T-shirts,Shirts,Jeans"
      }
    ]
  },
  {
    "featuredBrands": [{
        "brandName": "Ambrane",
        "userRating": 3.7
      },
      {

        "brandName": "Sony",
        "userRating": 4.2

      },
      {
        "brandName": "IPro",
        "userRating": 4.0
      }
    ]
  },
  {

    "recommendedItems": [{
        "itemName": "Stay Hungry Stay Foolish",
        "productCategory": "Books",
        "prouctPrice": "Rs 186",
        "offer": "3%"
      },
      {
        "itemName": "iPro IP 43 20800 mAh Power Bank  (White & Grey, Lithium-ion)",
        "productCategory": "Mobile Accessories",
        "prouctPrice": "Rs 1199",
        "offer": "60%"
      },
      {
        "itemName": "Micromax Canvas Pulse 4G (Grey, 16 GB)  (3 GB RAM)",
        "productCategory": "Mobile Phones",
        "prouctPrice": "Rs 11199",
        "offer": "12%"
      }
    ]

  }
]

//console.log(displayitem(users, "Rahul"));
console.log(displayitem1(users, "Stay Hungry Stay Foolish"));