1.暴利获取

const nowDate = new Date();

const date = {

year: nowDate.getFullYear(),

month: nowDate.getMonth() + 1,

date: nowDate.getDate(),

}

const newmonth = date.month>10?date.month:'0'+date.month

const day = date.date>10?date.date:'0'+date.date

let systemDate = date.year + '-' + newmonth + '-' + day

alert(systemDate)

2.组件moment

npm install moment

//js引入

let moment = require('moment');

//使用

//获取当前时间

let date=new Date();

//获取当前月的第一天

let monthStart = date.setDate(1);

//获取当前月

let currentMonth=date.getMonth();

//获取到下一个月，++currentMonth表示本月+1，一元运算

let nextMonth=++currentMonth;

//获取到下个月的第一天

let nextMonthFirstDay=new Date(date.getFullYear(),nextMonth,1);

//一天时间的毫秒数

let oneDay=1000*60*60*24;

//获取当前月第一天和最后一天

let firstDay = moment(monthStart).format("YYYY-MM-DD");

//nextMonthFirstDay-oneDay表示下个月的第一天减一天时间的毫秒数就是本月的最后一天

let lastDay = moment(nextMonthFirstDay-oneDay).format("YYYY-MM-DD");

alert(monthStart)

alert(firstDay)

alert(lastDay)