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javascript - 为什么我的对象键值对被覆盖而不是创建新的键值对？

问题描述

我正在尝试使用动态创建的键值对在对象中创建对象对象，但嵌套对象不断覆盖键值对而不是创建新的键值对。

ObjectIDWithQuestions = {};
var ArrayOfBlocks1 = [
  {
    ID: "block1",
    block: "block1",
    BlockElements: [
      { QuestionID: "1"  },
      { QuestionID: "2"  }
    ]
  },
  {
    ID: "block2",
    block: "block2",
    BlockElements: [
      {  QuestionID: "1"  },
      {  QuestionID: "2"  }
    ]
  },
  {
    ID: "block3",
    block: "block3",
    BlockElements: [
      {  QuestionID: "1"  },
      {  QuestionID: "2"  }
    ]
      }
];

for(i=0;i<ArrayOfBlocks1.length;i++){
    for(k=0;k<ArrayOfBlocks1[i].BlockElements.length;k++){
        var ArrayOfBlocks2 = ArrayOfBlocks1[i].ID
        ObjectIDWithQuestions[ArrayOfBlocks2]={}
        ObjectIDWithQuestions[""+ArrayOfBlocks2]["questions"+ k]=ArrayOfBlocks1[i].BlockElements[k].QuestionID

    }
}
console.log(ObjectIDWithQuestions);

代码的预期结果是创建一个对象，该对象是具有两个动态创建的键、值对而不是一个键、值对的对象的对象被覆盖。例如，以下代码打印：

block1: {questions1: "2"}
block2: {questions1: "2"}
block3: {questions1: "2"}

什么时候应该打印

block1: {questions0: "1",questions1:"2"}
block2: {questions0: "1",questions1:"2"}
block3: {questions0: "1",questions1:"2"}

标签： javascriptarraysobject

解决方案

你应该初始化

var ArrayOfBlocks2 = ArrayOfBlocks1[i].ID
ObjectIDWithQuestions[ArrayOfBlocks2]={}

在内循环之外。否则每次内部循环迭代时都会创建一个对象

ObjectIDWithQuestions = {};
var ArrayOfBlocks1 = [
  {
    ID: "block1",
    block: "block1",
    BlockElements: [
      { QuestionID: "1"  },
      { QuestionID: "2"  }
    ]
  },
  {
    ID: "block2",
    block: "block2",
    BlockElements: [
      {  QuestionID: "1"  },
      {  QuestionID: "2"  }
    ]
  },
  {
    ID: "block3",
    block: "block3",
    BlockElements: [
      {  QuestionID: "1"  },
      {  QuestionID: "2"  }
    ]
      }
];

for(i=0;i<ArrayOfBlocks1.length;i++){
     var ArrayOfBlocks2 = ArrayOfBlocks1[i].ID
     ObjectIDWithQuestions[ArrayOfBlocks2]={}
     for(k=0;k<ArrayOfBlocks1[i].BlockElements.length;k++){  
        ObjectIDWithQuestions[""+ArrayOfBlocks2]["questions"+ k]=ArrayOfBlocks1[i].BlockElements[k].QuestionID

     }
}
console.log(ObjectIDWithQuestions);

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