module.exports = {
    uuid() {
        //6位
        let _uuid = "";
        for (let i = 0; i < 6; i++) {
            if (Math.random() > 0.5) {
                //大于0.5就是数字，小于则是字母
                _uuid = _uuid + (Math.round((Math.random() * 100)) % 10 );
            } else {
                _uuid = _uuid + String.fromCharCode(97 + (Math.round(Math.random() * 100)) % 26);
            }
        }
        return _uuid;
    },
    distance(pos1,pos2){
        if(pos1.roomName==pos2.roomName){
            return Math.sqrt(Math.pow((pos1.x-pos2.x),2)+Math.pow((pos1.y-pos2.y),2));
        }
        return -1;//如果不在一个房间内，就返回负数。
    }

}