javascript sort排序

var arr = [5,32,28,66,2,15,3];
        arr.sort(function(a1,a2){   
            return a1-a2;  //a2-a1 输入倒序
        });
        console.log(arr);
        console.log(arr.reverse());  //reverse颠倒数组中元素的顺序

    var arr2 = [‘hezihao‘,‘chensan‘,‘xiaomin‘,‘lishi‘]
        arr2.sort();
        console.log(arr2);

    var arr3 = [‘6‘,‘8‘,‘0‘,‘7‘]
        arr3.sort();
        console.log(arr3);