function tl_login(ECode, Account, Password), 登录
ECode 为单位编码,蜂语填写字符串"XAFY01", Account 为用户名,Password 为口令,
通过上面回调,可能的返回结果如下:
{"code":"login_ok","uid":"240","account":"87888272","nickname":"aaaaa"}
{"code":"login_failed","reason":"wrong_credential"}
{"code":"login_failed","reason":"already_login"}