var arr = ["G","A","C","B","I","H","G","I","B"];

arr.sort();

console.log(arr);

var arr = [23,435,456,23,2,345,2,32,11,324,32,43,65,667,78,43];

arr.sort();

console.log(arr);

var arr = [23,435,456,23,2,345,2,32,11,324,32,43,65,667,78,43];

// 升序

arr.sort(function(a,b){

    //如果a要放在b前面，那么返回负数

    //如果a要放在b后面，那么返回正数

    //如果a和b不区分大小，那么返回0

    if(a < b){

        return -1;  //满足第一个条件，返回值是-1，a要排在b前面

    }else if(a > b){

        return 1;   //满足第二个条件，返回值是1，a要排在b后面

    }else if(a == b){

        return 0;

    }

});

console.log(arr);

//按五角星的个数排序

var arr = ["★★★","★★★★★","★★","★★★","★","★★★★★★★★","★★★","★★★★★"];

arr.sort(function(a,b){

    if(a.length > b.length){

        return -1;  //满足第一个条件，返回值是-1，a要排在b前面

    }else if(a.length < b.length){

        return 1;   //满足第二个条件，返回值是1，a要排在b后面

    }else{

        return 0;

    }

});

console.log(arr);