JavaScript - 构建复杂数据的对象

Question

我正在编写一个函数来“内存表中的数据”。函数签名(在 AngularJS 中)是

$scope.memoryTable = {};
$scope.memorize = function(name, category, value) {
     if (typeof name !== 'undefined' && typeof category !== 'undefined' && typeof value !== 'undefined') {

          // build data to $scope.memoryTable

     }
}

每次 View 评估表中的单元格数据时都会调用此memorise函数，并将该值添加到$scope.memoryTable

现在，我想要实现的是按照以下结构构建一个数组:

{
  "$name": {
    "$category": "$value"
  }
}

例如:

> memorize("David", "animal", "cat");
> memorize("David", "book", "fiction");
> memorize("Thomas", "animal", "dog");

会产生

console.log(JSON.stringify($scope.memoryTable));

{
  "David": {
    "animal": "cat",
    "book": "fiction"
  },
  "Thomas": {
    "animal": "dog",
  }
}

我应该如何编写代码来构建该数据表？

Answer 1

所以，你没有使用数组，你实际上使用的是普通的旧 JavaScript 对象。

$scope.memoryTable = {};
$scope.memorize = function(name, category, value) {
    if (typeof name !== 'undefined' &&
            typeof category !== 'undefined' &&
            typeof value !== 'undefined') {
        // build data to $scope.memoryTable
        // First, make sure there is an entry for name.
        $scope.memoryTable[name] = $scope.memoryTable[name] || {};
        // Then, set the value for category under that name.
        $scope.memoryTable[name][category] = value;
    }
}