如何从一系列月份对象[{month：'Jan'id：'1}，{month：'Feb'，id：'2}，…{month：'Dec'，id ：12}]？

Question

I tried array slice but its not giving expected result if starting month is one of the last 3 months of the year.

If current month is November then its should give November to February list

Answer 1

Simply double the array and then slice it

var newArr = [ ...arr, ...arr ];
var index = 10;
var output = newArr.slice( index, index + 4 )

Demo

 var arr = [{ month: 'Jan', id: "1" }, { month: 'Feb', id: "2" }, { month: 'Mar', id: "3" }, { month: 'Apr', id: "4" }, { month: 'May', id: "5" }, { month: 'Jun', id: "6" }, { month: 'Jul', id: "7" }, { month: 'Aug', id: "8" }, { month: 'Sep', id: "9" }, { month: 'Oct', id: "10" }, { month: 'Nov', id: "11" }, { month: 'Dec', id: "12" }]; var newArr = [ ...arr, ...arr ]; //console.log( newArr ); var index = 10; var output = newArr.slice(index, index+4); console.log( output ); 

If spread ... is not supported, then use concat

var newArr = arr.concat(arr.slice())

Answer 2

A lengthy approach but works.

 let months = ['Jan','Feb', 'Mar', 'Apr', 'May' ,'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'] let currMonth_id = new Date().getMonth(); let output = []; output.push({month: months[currMonth_id], id: currMonth_id+1}); for(let i = 1 ; i < 4; i++) { let nextMonth_id = (currMonth_id + i) % 12; output.push({month: months[nextMonth_id], id: nextMonth_id+1}); } console.log(output)