1、獲取當前的時間：

let i = new Date();
let newTime = i.toLocaleDateString();

    用moment完成時間的轉換

let now = new Date();
let date = new Date(now.getTime());
let time = moment(date,'x').format('YYYY-MM-DD HH:mm:ss');

2、獲取之前的某一天的時間：

let now = new Date();
let date = new Date(now.getTime());
let year = date.getFullYear();
let month = date.getMonth() + 1;
let day = date.getDate();
let newTime = year + '-' + month + '-' + day;
 

3、獲取之前一週的每一天的日期：

let myDate = new Date();
myDate.setDate(myDate.getDate());
let dateArray = [];
let dateTemp;
let flag = 1;
for (let i = 7; i > 0; i--) {
dateTemp = myDate.getFullYear() + "-" + (myDate.getMonth()+1) + "-" + myDate.getDate();
dateArray.push(dateTemp);          
myDate.setDate(myDate.getDate() - flag);
}