// 定义游戏单位状态
enum UnitStatus {
    US_1 = 1 << 1,
    US_2 = 1 << 2,
    US_3 = 1 << 3,
    US_4 = 1 << 4,
}

/**
 * 单位类
 *
 * @class Unit
 */
class Unit {
    unitFlag: number = 0;   // 当前单位的状态标识

    /**
     * 设置当前状态位
     *
     * @param {UnitStatus} flag
     * @memberof Unit
     */
    setFlag(flag: UnitStatus) {
        this.unitFlag = this.unitFlag | flag;
    }

    /**
     * 是否有当前状态位
     *
     * @param {UnitStatus} flag
     * @returns {boolean}
     * @memberof Unit
     */
    hasFlag(flag: UnitStatus) : boolean {
        return !!(this.unitFlag & flag);
    }

    /**
     * 清除当前状态位
     *
     * @param {UnitStatus} flag
     * @memberof Unit
     */
    clearFlag(flag: UnitStatus) {
        this.unitFlag = this.unitFlag & (~flag);
    }

    /**
     * 重置当前状态位
     *
     * @memberof Unit
     */
    resetFlag() {
        this.unitFlag = 0;
    }
}

let unit = new Unit();
console.log('add UnitStatus.US_1 UnitStatus.US_2');
unit.setFlag(UnitStatus.US_1 | UnitStatus.US_2);
console.log('unit has UnitStatus.US_1?', unit.hasFlag(UnitStatus.US_1));
console.log('unit has UnitStatus.US_2?', unit.hasFlag(UnitStatus.US_2));
console.log('unit has UnitStatus.US_3?', unit.hasFlag(UnitStatus.US_3));
console.log('unit has UnitStatus.US_4?', unit.hasFlag(UnitStatus.US_4));
console.log('remove UnitStatus.US_1');
unit.clearFlag(UnitStatus.US_1);
console.log('unit has UnitStatus.US_1?', unit.hasFlag(UnitStatus.US_1));
console.log('unit has UnitStatus.US_2?', unit.hasFlag(UnitStatus.US_2));
console.log('unit has UnitStatus.US_3?', unit.hasFlag(UnitStatus.US_3));
console.log('unit has UnitStatus.US_4?', unit.hasFlag(UnitStatus.US_4));
console.log('reset unit status');
unit.resetFlag();
console.log('unit has UnitStatus.US_1?', unit.hasFlag(UnitStatus.US_1));
console.log('unit has UnitStatus.US_2?', unit.hasFlag(UnitStatus.US_2));
console.log('unit has UnitStatus.US_3?', unit.hasFlag(UnitStatus.US_3));
console.log('unit has UnitStatus.US_4?', unit.hasFlag(UnitStatus.US_4));