js获取年、月、日、时分秒、昨天、明天、本周（7天）日期

0 获取本周（周一~~周日）

getweekDates () {
                let new_Date = new Date()
                let timesStamp = new_Date.getTime()
                let currenDay = new_Date.getDay()
                let dates = []
                for (var i = 0; i < 7; i++) {
                    let time = new Date(timesStamp + 24 * 60 * 60 * 1000 * (i - (currenDay + 6) % 7)).toLocaleDateString().replace(/[年月]/g, '-').replace(/[日上下午]/g, '')
                    dates.push(time.split('/'))
                }
                return dates
            }

1 获取今年

 let now = new Date();
 let year = now.getFullYear();  // 年

2 获取当月

 let now = new Date();
 let month = now.getMonth()  // 月

3 获取当日

 let now = new Date();
 let day = now.getDate() // 日

4 获取周几

 let now = new Date();
 let weekday = now.getDay(); // 日

5 获取时、分、秒、毫秒

let hour = now.getHours();//时
let minu = now.getMinutes();//分
let sec = now.getSeconds();//秒
let ms = now.getMilliseconds();//毫秒

6 获取昨天

let now = new Date();
now.setTime(now.getTime()-24*60*60*1000);
var yesterday= now.getFullYear()+"-" + (now.getMonth()+1) + "-" + now.getDate();

7 获取明天

let now = new Date();
now.setTime(now.getTime()+24*60*60*1000);
var yesterday= now.getFullYear()+"-" + (now.getMonth()+1) + "-" + now.getDate();