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每次调用我的函数时，我想打印下一天的名字

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我需要创建一个名为NextDay（）的javascript函数 . 此功能应该在控制台中打印第二天的名称 .

我创建了一个函数如下：

//Function to Print the name of Next Day in Javascript
    var NextDay = (function () {
    counter = 0;
    var nextDay = function () {

        var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", 
                     "Friday", "Saturday"];
        var date = new Date();
        var dayNumber = date.getDay() + counter;
        if (dayNumber < 6) {
            dayNumber = dayNumber;
        }
        else {
            dayNumber = (dayNumber % 6);
        }
        var dayName = days[dayNumber];
        counter += 1;
        return dayName;
    };

    return nextDay;
})();
NextDay();
NextDay();
NextDay();
NextDay();
NextDay();
NextDay();
NextDay();
NextDay();

我期待输出为：

星期六星期天
周一周二周三周四周五周六

但我得到的输出如下：周日周一周二周三周四周五周日周一

我相信我错过了一些非常小的东西，因为我在这里跳过了一天 . 请建议

javascript arrays closures

2 回答

  • 1

    我不确定你的哪一个数学出错了，但这是一个更简单的方法：

    var counter =(new Date).getDay();
var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
var nextDay = function () {
    var day=days[counter];
    counter = (counter+1)%7;
    return day;
};
    回复于
  • 1

    发电机功能可能很方便 .

    function* nextDay() {
  let i = 0,
      days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
  while (i < 7) {
    yield console.log(days[i++]);
    if (i == 7) i = 0;
  }
}

let gen = nextDay();
gen.next();
gen.next();
gen.next();
gen.next();
gen.next();
gen.next();
gen.next();
gen.next();
gen.next();
    回复于

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