JQuery получить параметр из URL, а затем делать вещи

Create function fn_GetNumbersOnly(@pn varchar(100))
    Returns varchar(max)
    AS
    BEGIN
      Declare @r varchar(max) ='', @len int ,@c char(1), @x int = 0
      Select @len = len(@pn)
      while @x <= @len 
      begin
        Select @c = SUBSTRING(@pn,@x,1)
        if ISNUMERIC(@c) = 1 and @c <> '-'
         Select @r = @r + @c
       Select @x = @x +1
      end
    return @r
End