昨天，明天，月初，月末，最近七天，最近一个月，今天零时js

var now = new Date(); //当前时间

var nowMonth = now.getMonth(); 

var nowYear = now.getFullYear(); 

1.当前时间前一天（昨天）

var preDate = new Date(now.getTime() - 24 * 60 * 60 * 1000); 

2.当前时间后一天（明天）

var nextDate = new Date(now.getTime() + 24 * 60 * 60 * 1000); 

3.本月月初零时

var monthStartDate = new Date(nowYear, nowMonth, 1);

4.本月月末零时

var monthEndDate = new Date(nowYear, nowMonth + 1, 0);

5.当天零时

var nowStartTime = new Date(now.setHours(0,0,0,0))

6.最近7天

var sevenDays = new Date(now.getTime() - 24 * 60 * 60 * 1000 * 7); 

7.最近30天

var thirtyDays = new Date(now.getTime() - 24 * 60 * 60 * 1000 * 30);