parseInt('11111111111111111111111111111111', 2);  // 4294967295

// 33位二進(jìn)制數(shù)，得到十進(jìn)制數(shù)字 8589934591
parseInt('111111111111111111111111111111111', 2); // 8589934591
  
// 對(duì)數(shù)字進(jìn)行無(wú)符號(hào)位右移
8589934591 >>> 0; // 4294967295
4294967295 >>> 0; // 4294967295

// 游戲狀態(tài)定義
export enum GAME_STATE{
   INIT = 1 << 0,      // 二進(jìn)制表示：00001
   JOIN = 1 << 1,      // 二進(jìn)制表示：00010
   PREPARE = 1 << 2,   // 二進(jìn)制表示：00100
   PLAY = 1 << 3,      // 二進(jìn)制表示：01000
}

// 根據(jù)狀態(tài)渲染按鈕
function RenderButton({state, changeState}){
	if((state & GAME_STATE.PLAY) === GAME_STATE.PLAY){
		return null;
	}
	
	if((state & GAME_STATE.INIT) === GAME_STATE.INIT){
		return <button 
				onClick={() => changeState(GAME_STATE.JOIN)}
		    >加入游戲</button>
	}
	
	if((state & GAME_STATE.JOIN) === GAME_STATE.JOIN){
		return <button 
				onClick={() => changeState(GAME_STATE.PREPARE)}
			>準(zhǔn)備游戲</button>
	}

	if((state & GAME_STATE.PREPARE) === GAME_STATE.PREPARE){
		return <button 
				onClick={() => changeState(GAME_STATE.PLAY)}
			>開(kāi)始游戲</button>
	}

	return null;
}
  
// 渲染游戲頁(yè)面
function Page(){
	const state = useRef(GAME_STATE.INIT);

	const changeState = useCallback((newState) => {
		state.current = newState;
	}, [state]);

	return (<div>
		// ....other code
		<RenderButton state={state.current} changeState={changeState} />
	</div>);
}

export enum ARTICLE_RULE{
	VIEW = 1 << 0,     // 查看文章
	EDIT = 1 << 1,     // 編輯文章
	PUBLISH = 1 << 2,  // 發(fā)布文章
	DELETE = 1 << 3,   // 刪除文章
} 

export enum ROLE{
	GUEST = ARTICLE_RULE.VIEW,    // 訪客
	ADMIN = ARTICLE_RULE.VIEW | ARTICLE_RULE.EDIT | ARTICLE_RULE.PUBLISH | ARTICLE_RULE.DELETE,  // 超級(jí)管理員
	OPERATOR = ARTICLE_RULE.VIEW | ARTICLE_RULE.EDIT | ARTICLE_RULE.PUBLISH，  // 運(yùn)營(yíng)
}

if(user.role === 'admin'){ 
	console.log("user擁有admin權(quán)限");
	user.rule = ROLE.ADMIN; // 賦予角色權(quán)限
}

if((user.rule & ARTICLE_RULE.DELETE) === ARTICLE_RULE.DELETE){
	console.log("user擁有刪除文章權(quán)限"); 
}

function isOdd(number){
	return number & 1 === 1;
}

let a = 1;
let b = 2;

a = a ^ b;  // 這一步，a緩存了 a ^ b 的結(jié)果
b = a ^ b;  // 等價(jià)為: b = a ^ b ^ b, 其中 b ^ b = 0; 所以 b = a ^ 0 = a
a = a ^ b;  // 同上

function isEqual(number1, number2){
	return (number1 ^ number2) === 0;
}

function isMinus(number){
	return number !== (number >>> 0);
}

function toInt(floatNumber){
	return floatNumber >>> 0;
}

function toInt(floatNumber){
	return floatNumber | 0;
}

function toInt(floatNumber){
	return ~~floatNumber;
}

function toInt(floatNumber){
	return floatNumber >> 0;
}

function dec2bin(dec){
	return (dec).toString(2);
}

function bin2dec(bin){
	return parseInt(`${bin}`, 2)
}