Reference of v4 song random

arguments	description	optional
start	range of start	YES when end is not passed in
end	range of end	YES

Explain

Roll a song from a given difficulty range.

Return data

• The default range is 2 to 23.
  For easier storage and higher compatibility,
  We make the song rating table from

  1 2 3 4 5 6 7 8 9 9+ 10 10+ 11

  expanded to

  1 1+ 2 2+ 3 3+ 4 4+ 5 5+ 6 6+ 7 7+ 8 8+ 9 9+ 10 10+ 11 11+

  So the algorithm is (ratingNumber * 2) + (ratingPlus ? 1 : 0)
  As you can see, now the range is 2 to 23.

• We removed the full song info output feature in this version.
  Make it clean and dry. If you want to get the song info in the same request, Please reference the batch api.

{
    "status": 0,
    "content": {
        "id": "ifi",
        "rating_class": 2
    }
}

Error status

status	description
0	everything is OK
-1	invalid range of start
-2	invalid range of end
-3	internal error
-233	unknown error occurred