如何将JSON对象的第一个元素移到末尾？

Question

嗨，我有这样的JSON：

[
  "supplier" : "Apple",
  "features" : {
      "0": [
        {
          "feature_id": "58d1b42ec2ef165bbfca0873",
          "symbol": "tick"
        },
        {
          "feature_id": "58d4b843bd966f52093ce32f",
          "symbol": "cross"
        }
      ],
      "1":[
        {
          "feature_id": "58d1b42ec2ef165bb33422087",
          "symbol": "tick"
        },
        {
          "feature_id": "58d4b843bd91ads2jfloice32",
          "symbol": "cross"
        }

      ]
  },
  "supplier" : "Orange",
  "features" : {
      "0": [
        {
          "feature_id": "58d1b42ec2ef165bbfca0873",
          "symbol": "tick"
        },
        {
          "feature_id": "58d4b843bd966f52093ce32f",
          "symbol": "cross"
        }
      ],
      "1":[
        {
          "feature_id": "58d1b42ec2ef165bb33422087",
          "symbol": "tick"
        },
        {
          "feature_id": "58d4b843bd91ads2jfloice32",
          "symbol": "cross"
        }

      ]
  }
]

如何使用jQuery / javascript将功能对象键“ 0”移动到键“ 0”之后的末尾？ 我试图使用array.push（array.shift（））; 但是它抛出错误，说“ array.shift（）”不是一个函数。 我猜.features不是数组，那么如何将对象移到末尾？

Answer 1

要素是对象而不是数组是有原因的吗？ 您可以执行以下操作：

"features" : [
      [
        {
          "feature_id": "58d1b42ec2ef165bbfca0873",
          "symbol": "tick"
        },
        {
          "feature_id": "58d4b843bd966f52093ce32f",
          "symbol": "cross"
        }
      ],
      [
        {
          "feature_id": "58d1b42ec2ef165bb33422087",
          "symbol": "tick"
        },
        {
          "feature_id": "58d4b843bd91ads2jfloice32",
          "symbol": "cross"
        }
      ]
  }

如果您只是计划使用数字作为键，那没有问题。 否则，您可以使用Object.keys(features)获得对象键的数组（在您的情况下为“ 1”，“ 2”，...），并在需要时使用它们引用对象。

Answer 2

使用临时变量交换

var data = {

  "supplier" : "Apple",
  "features" : {
      "0": [
        {
          "feature_id": "58d1b42ec2ef165bbfca0873",
          "symbol": "tick"
        },
        {
          "feature_id": "58d4b843bd966f52093ce32f",
          "symbol": "cross"
        }
      ],
      "1":[
        {
          "feature_id": "58d1b42ec2ef165bb33422087",
          "symbol": "tick"
        },
        {
          "feature_id": "58d4b843bd91ads2jfloice32",
          "symbol": "cross"
        }

      ]
  }
  };


function swap(obj,index1,index2){
    var temp = obj[index1];
    obj[index1] = obj[index2];
    obj[index2] = temp;
    return obj;
}

data.features = swap(data.features,"0","1");

//现在features [“ 0”] <==> features [“ 1”];