在对象内的函数之间传递值

Question

我正在制作迷你日历。我试图将适当的值传递到对象的视图部分。但我继续在视图部分中定义未定义。我究竟做错了什么？

var date = {  

  monthsArray: ["January", "February","March","April","May","June","July","August", "September", "October", "November","December" ],
  init: function() {
    var fullDate = new Date();
    this.dateParsed(fullDate);
    this.view();
  },
  stringifyMonth: function(monthNumber) {
    var monthName = this.monthsArray[monthNumber]
    return monthName
  },
  dateParsed: function(fullDate){
   var fullDate = new Date();
   var monthNumber = fullDate.getMonth();
   var dayNumber = fullDate.getDate();
   var calanderYear = fullDate.getFullYear();
   this.stringifyMonth(monthNumber)
   return calanderYear
  },
  view: function(monthName){

    console.log(this.stringifyMonth())   ///  undefined 


  }

}.init()

Answer 1

两件事：

1. 将当前月份传递给view功能。您可以使用getMonth()
从日期对象中获取月份
2. 将同一个月传递给stringifyMonth
的view

查看突出显示的更改和评论

var date = {

  monthsArray: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
  init: function() {
    var fullDate = new Date();
    this.dateParsed(fullDate);

    
    // Get the current month from date object and pass to the view()
    this.view(fullDate.getMonth()); // <-----
  },
  stringifyMonth: function(monthNumber) {
    var monthName = this.monthsArray[monthNumber]
    return monthName
  },
  dateParsed: function(fullDate) {
    var fullDate = new Date();
    var monthNumber = fullDate.getMonth();
    var dayNumber = fullDate.getDate();
    var calanderYear = fullDate.getFullYear();
    this.stringifyMonth(monthNumber)
    return calanderYear
  },
  view: function(monthName) {
    
    // Pass the monthName to the stringifyMonth()
    console.log(this.stringifyMonth(monthName)); // <-----
  }
}.init();

Answer 2

stringifyMonth需要一个参数，但你没有传递一个参数。 因此， null 作为参数传递，然后您尝试访问this.monthsArray [null]，这是未定义的。

尝试传递一个像1这样的参数，你会看到它打印二月。