Question

我想用JavaScript编写2019年的所有日期，日期和月份。通过使用3个功能。我只找到了我可以使用的1个函数，但没有弄清楚。任何人都有一些想法或提示吗？谢谢。

我需要一个NameOfTheMonths，NameOfTheWeekdays和DaysInAMonth函数。每种功能之一。函数中不应包含任何打印，所有打印均应与迭代结合进行。

document.writeln("Days in 2019 is:");

var months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

for (var i = 0; i<=months.length; i++)
{
    for (var k = 1; k<=31; k++)
    {
        document.write(months[i]);
        document.writeln(k);

    }
}
function rightAdjust(x, size)
{
    x = "" + x; // secure that x is a string

    var noOfBlanks = size - x.length;
    var blanks = "";
    for (var i = 0; i < noOfBlanks; i++)
    {
        blanks = blanks + " ";
    }

    return blanks + x;
}
var months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

var days; 
days = DaysInAMonth(k);

for (var i = 0; i<=months.length; i++){

    for (var k = 1; k<=days.length; k++)
    {
        document.write(months[i]);
        document.writeln(days);

    }
    }

    function DaysInAMonth(days)
    {
        var result; 

         if (months == [0])
        {
            return 31;
        }
        else if (months == [1])
        {
            return 28;
        }
        else if (months == [2])
        {
            return 31;
        }
        else if (months == [3])
        { 
            return 30;
        }
        else if (months == [4])
        {
            return 31;
        }
        else if (months == [5])
        {
            return 30;
        }
        else if (months == [6])
        {
            return 31;
        }
        else if (months == [7])
        {
            return 31;
        }
        else if (months == [8])
        {
            return 30;
        }
        else if (months == [9])
        {
            return 31;
        }
        else if (months == [10])
        {
            return 30;
        }
        else if (months == [11])
        {
            return 31;
        }
    }
    document.write(DaysInAMonth(1));

Answer 1

在JavaScript中，我只会使用一个对象。

obj = {months:[
  {name: "january", days: 31},
  {name: "febuary", days: 28},
  {name: "march", days: 31},
  {name: "april", days: 30},
    ...
]}

并在具有工作日名称数组的对象上进行一些嵌套的forEach()和for循环，并在工作日名称的数组索引上进行MOD。

printyear(firstdayindex = 0) {
  let days = ["mon","tues", "wed"....]
  let currentday = firstdayindex;
  obj.months.forEach((m) => {
     for (int x = 1; x <= m.days; x++) { console.log(days[(currentday++)%7]+ x + m.name) }
  })
}

但是，如果您真的想抽象出这些功能，我相信您可以执行以下操作：

NameOfTheMonths() {
  let names = [];
  obj.months.forEach(m => {names.push(m.name);
  return names;})
}

NameOfTheWeekdays() {//just return an array of names }

DaysInAMonth(month) {obj.months.findIndex(m=>m.name===month).days}

有了关于具体应该做什么的更多信息，我可能可以添加更多，但是我个人将不执行这三个功能就去完成该任务，并且只对上面描述的对象进行操作，因为您唯一需要的输入就是一年的第一天是星期几。然后，您将需要做更多的工作才能从3个功能中将数据整理在一起。

使用JavaScript的简单日历

1 个答案: