Lua脚本获取喜马拉雅MP3音频地址

#!/usr/bin/lua5.1--需要luacurl http://luacurl.luaforge.net/--luajson https://github.com/mbalmer/luajsonrequire("luacurl")require('json')function get_html(url, c)  local result = { }  if c == nil then    c = curl.new()  end  c:setopt(curl.OPT_URL, url)  c:setopt(curl.OPT_WRITEDATA, result)  c:setopt(curl.OPT_WRITEFUNCTION, function(tab, buffer)   --call back函数，必须有    table.insert(tab, buffer)           --tab参数即为result，参考http://luacurl.luaforge.net/    return #buffer  end)  local ok = c:perform()  return ok, table.concat(result)       --此table非上一个table，作用域不同endfunction downMp3(id)    local url="http://www.ximalaya.com/tracks/"..id..".json"  local mp3 = "http://fdfs.xmcdn.com/"  local ok,html = get_html(url)  if ok then    local result = json.decode(html)    print(mp3..result.play_path_64)  else    print("error")  endendif arg[1] and tonumber(arg[1]) then  downMp3(arg[1])else  print("请输入编号")end