升序(默认)

var points = [40, 100, 1, 5, 25, 10];
points.sort(function(a, b){return a-b})
//points.sort()

结果：
(6) [1, 5, 10, 25, 40, 100]
降序

var points = [40, 100, 1, 5, 25, 10];
points.sort(function(a, b){return b-a});

结果：
(6) [100, 40, 25, 10, 5, 1]

来源：w3c
https://www.w3school.com.cn/js/js_array_sort.asp