我的所有值都是数字类型时返回Nan

Question

我正在执行摘要功能，该功能将显示myToDos的摘要，但是在控制台中它显示“您今天有NaN会议！”而我正在使用数字类型的所有变量。

let myTodos={
    day: 'Monday',
    meetings: 0,
    meetDone: 0,

    addMeeting: function(num){
        this.meetings = this.meetings + num;  
    },
    meetDone: function(meet=0) {
        this.meetDone = this.meetDone + meet;
    },
    resetDay: function(){
        this.meetings = 0;
        this.meetDone = 0;
    },
    summary: function(){
        let leftmeetings = this.meetings - this.meetDone;
        return `You have ${leftmeetings} meetings today!`
    }
}

myTodos.addMeeting(5);
myTodos.meetDone(3);
console.log(myTodos.summary());

我希望输出为

  

javascript

"You have 2 meetings today!"

Answer 1

如注释中所述，您具有重复的属性。

将meetDone重命名为done将消除冲突。

let myTodos = {
  day: "Monday",
  meetings: 0,
  done: 0,

  addMeeting: function(num) {
    this.meetings = this.meetings + num;
  },
  meetDone: function(meet = 0) {
    this.done = this.done + meet;
  },
  resetDay: function() {
    this.meetings = 0;
    this.meetDone = 0;
  },
  summary: function() {
    let leftmeetings = this.meetings - this.done;
    return `You have ${leftmeetings} meetings today!`;
  }
};

myTodos.addMeeting(5);
myTodos.meetDone(3);
console.log(myTodos.summary());

输出：

  

您今天有2次会议！