Well, first you get the date at the current time (today), then you subtract a day from it:
好吧，首先获取当前时间(今天)的日期，然后从中减去一天：
const today = new Date()
const yesterday = new Date(today)
yesterday.setDate(yesterday.getDate() - 1)
today.toDateString()
yesterday.toDateString()
We use the
setDate()
method on
yesterday
, passing as parameter the current day minus one.
我们在
yesterday
使用
setDate()
方法，将当前日期减一作为参数传递。
Even if it’s day 1 of the month, JavaScript is logical enough and it will point to the last day of the previous month.
即使是每月的第一天，JavaScript也足够逻辑，它将指向上个月的最后一天。
翻译自:
https://flaviocopes.com/how-to-get-yesterday-date-javascript/