冒泡排序

var arr = [9,5,8,2,6,7,1,3];
for(var i = 0; i<arr.length; i++){
    for(var j = i+1; j < arr.length; j++){
        if(arr[i]>arr[j]){
            var b = arr[i];
            arr[i] = arr[j];
            arr[j] = b;
        }
    }
}