JS-获取星期几 [英] JS- Get days of the week

问题描述

我正在尝试创建一个函数以获取给定日期的一周中的所有天。我有一个我认为一直有效的函数，直到我注意到如果一周中的某天接近月底，例如2月，我得到了奇怪的数据。任何人都知道发生了什么事以及如何解决它？

I'm trying to make a function to get all the days of the week given the current day.I had a function that i thought was working until i noticed that if the day of the week is near the end of the month, like for example February, i get weird data. Anyone know whats going on and how to fix it?

function days(current) {
  var week = new Array();
  // Starting Monday not Sunday 
  var first = ((current.getDate() - current.getDay()) + 1);
  for (var i = 0; i < 7; i++) {
    week.push(
      new Date(current.setDate(first++))
    );
  }
  return week;
}

var input = new Date(2017, 1, 27);
console.log('input: %s', input);

var result = days(input);
console.log(result.map(d => d.toString()));

.as-console-wrapper{min-height:100%}

推荐答案

如果您不想使用诸如Moment.js之类的其他类型的库，则还可以稍微更改一下函数，然后它就会起作用。试试这个：

If you don't want to use some kind of other library like Moment.js you can also change your function a little and then it will work. Try this:

function dates(current) {
    var week= new Array(); 
    // Starting Monday not Sunday
    current.setDate((current.getDate() - current.getDay() +1));
    for (var i = 0; i < 7; i++) {
        week.push(
            new Date(current)
        ); 
        current.setDate(current.getDate() +1);
    }
    return week; 
}
console.log(dates(new Date(2017, 1, 27)));

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