使用getDay Javascript获取明天的日期 [英] Get tomorrow's date with getDay Javascript

问题描述

我所做的是一个天气预报网站，而我所需要的是一周的时间（即星期日，星期一等）。为了获得明天的日期，我只是像另一个问题中的人一样提出+ 1，但是当它到星期六，它说未定义。当星期六到达时，如何做到这一点，+ 1将循环到星期天？感谢提前！

  var day = new Date（）; 
 var weekday = new Array（7）; 
 weekday [0] =Sunday; 
 weekday [1] =星期一; 
 weekday [2] =Tuesday; 
 weekday [3] =星期三; 
 weekday [4] =星期四; 
 weekday [5] =Friday; 
 weekday [6] =星期六; 
 
 document.getElementById（'tomorrow'）。innerHTML = weekday [day.getDay（）+ 1]; 
 document.getElementById（'twodays'）。innerHTML = weekday [day.getDay（）+ 2]; 
 document.getElementById（'threedays'）。innerHTML = weekday [day.getDay（）+ 3]; 
  

解决方案

使用（day.getDay （）+ i）％7 。这只会在0-6之间返回结果。

What I am making is a weather forecast website, and what I need is the days of the week (ie. "Sunday", "Monday", etc.). To get tomorrow's date I am just putting "+ 1" like someone suggested in another question, but when it get's to Saturday, it says "undefined". How do I make it so when it gets to Saturday, + 1 will loop over to Sunday? Thanks in advance!

var day=new Date();
var weekday=new Array(7);
weekday[0]="Sunday";
weekday[1]="Monday";
weekday[2]="Tuesday";
weekday[3]="Wednesday";
weekday[4]="Thursday";
weekday[5]="Friday";
weekday[6]="Saturday";

document.getElementById('tomorrow').innerHTML = weekday[day.getDay() + 1];
document.getElementById('twodays').innerHTML = weekday[day.getDay() + 2];
document.getElementById('threedays').innerHTML = weekday[day.getDay() + 3];

解决方案

Use (day.getDay() + i) % 7. That will only return results between 0-6.

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