Javascript 尝试创建按日期排序的数组时，无法设置未定义错误的“something”属性。

我发布了一个相关的问题，@Kato帮我解答了一个问题。我试图实现他的答案，但得到一个错误，不能设置未定义的属性

我制作了一份尽可能详细的plnkr：

您需要初始化列表[周号]：

您需要初始化列表[周号]：

---

出现该错误的原因是，您试图将属性添加到列表[week_num]，而该属性不是对象

你可以

list[week_number] = list[week_number] || {};
list[week_number][week_day] = data;

或

---

出现该错误的原因是，您试图将属性添加到列表[week_num]，而该属性不是对象

你可以

list[week_number] = list[week_number] || {};
list[week_number][week_day] = data;

或

list[week_number] = list[week_number] || {};
list[week_number][week_day] = data;

if(!angular.isObject(list[week_number]) {
    list[week_number] = {};
}
list[week_number][week_day] = data;