javascript - 如何在空对象中添加新的键和值？

Question

我有一个 null 对象。我想在其中添加动态键和对象。

尝试过

this.myObj[`${dayValue}`] = {};  //1

this.withDayTimeSlot[dayValue] = [targetValue];

错误

TypeError: Cannot set property '5' of null at ...

我的动态对象将如下所示。

{
  '5':[],
  '6':[]
}

Answer 1

您无法在 null 对象中设置属性。它需要首先作为空对象 {} 启动。

this.myObj = {};
this.myObj[`${dayValue}`] = []; // [] since your desired value in the object is an empty array [] and not an empty object {}