sort进行排序
var arr = [100,50,90,30,80];
function sortNum (a,b){
console.log(a);
console.log(b);
return a-b
}
console.log(arr.sort(sortNum));
a-b 是升序
b-a是降序
sort进行排序
var arr = [100,50,90,30,80];
function sortNum (a,b){
console.log(a);
console.log(b);
return a-b
}
console.log(arr.sort(sortNum));
a-b 是升序
b-a是降序