聊天channelService

    channel :{

records : {'20110' : {uid : '20110', sid : 'connector-server-1'}}, //以uid为key

groups : {'connector-server-1' : ['20110', ] } //以前端服务器Id为key

}

getMessageTargetByUids( uids, next)

getMessageTargetByServerType( serverType, next);

玩家登陆, channel.add( uid, sid);

玩家离开, channel.leave( uid, sid); //onUserLeave

有时候会清除不掉 这时候使用pushMessage会推送多条信息