js数组排序- sort()

a.按字母顺序升序

var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.sort();

b.按数字顺序升序

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

c.按数字顺序降序

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