javascript - 使用 getDay Javascript 获取明天的日期

Question

我正在做的是一个天气预报网站，我需要的是星期几(即“星期日”、“星期一”等)。为了得到明天的日期，我只是像另一个问题中有人建议的那样输入“+ 1”，但是到了星期六，它会说“未定义”。我如何做到这一点，所以当它到达星期六时，+ 1 将循环到星期日？提前致谢!

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];

Answer 1

要向 javascript Date 对象添加一天，您可以这样做:

var date =new Date();
//use the constructor to create by milliseconds
var tomorrow = new Date(date.getTime() + 24 * 60 * 60 * 1000);

注意，获取日期。

Date.getDay根据星期几返回 0-6 之间的数字。

所以你会这样做:

var date =new Date();
var tomorrow = new Date(date.getTime() + 24 * 60 * 60 * 1000);
var twoDays = new Date(date.getTime() + 2 * 24 * 60 * 60 * 1000);
var threeDays  = new Date(date.getTime() + 3 * 24 * 60 * 60 * 1000);

document.getElementById('tomorrow').innerHTML = weekday[tomorrow.getDay()];
document.getElementById('twodays').innerHTML = weekday[twoDays.getDay()];
document.getElementById('threedays').innerHTML = weekday[threeDays.getDay()];

编辑:修正拼写错误