Use js to obtain the last quarter based on the current quarter

var myDate = new Date();
var today= myDate.toLocaleDateString();// Get current date
var strYear = myDate.getFullYear();
var strMonth = myDate.getMonth() + 1;
var strQuarter = Math.floor((strMonth % 3 == 0 ? (strMonth / 3) : (strMonth / 3 + 1)));
strYear=((strQuarter==1)?(strYear-1):(strYear));

strQuarter=((strQuarter==1)?(4):(strQuarter-1));

Be careful ： When the date is 01-01---03-31 Yes, in the first quarter , We need to put the year -1 That is, the fourth quarter of the previous year

incidentally ： I wrote a get current date .

（ You can refer to the judgment based on the current date to obtain the last quarter ）

Here I write such a method , Another way is for the great God to discuss and share