开发服务器 GET https://api.weixin.qq.com/sns/jscode2session

     传入开发服务器事前：GET https://api.weixin.qq.com/cgi-bin/token 得到的access_token

    比如：access_token=65_DAljgJL0957cbXBXX0bN5wvoxdqsxxRZT5aJhTTvPP-SkaPHhaiorsrhgjTqYAEFclqGjEd4x4G9zcjFTEFfnCFXQeY3fJtF6ZGWFspRyBPbeethBuWCe_-A6NwPNIdAJAIGB&appid=wxc5dbd50af28e8127&secret=d3***************4efc&js_code=061n2a100F8EwP13C3300UGWhX3n2a1D&grant_type=authorization_code

返回仍旧提示：access_token不能为空。拿不到 session_key