js数组去重并升序

var s = new Set();

var arr = [2，1，3，1，4]

arr.map((x,i)=> s.add(x));

var b =Array.from(s)

2,1,3,4

var numbers = [2,1,3,4];

numbers.sort((a, b) => a - b);

console.log(numbers);

1,2,3,4