Re: ES5 中跟 '===' 很像的 SameValue

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奧 === / !== 腔扢數ㄛ扂砑翋猁岆植最唗埜腔源晞堤楷﹝�蝜�+0 !== -0ㄛ謁鷓岆峊掖湮嗣杅�佽齡掛黤纂ㄠ��蔻ath.round(-0.1)
=== 0殿隙false頗�蠍佪散辣恣�


遜衄斕枑善腔涴跺潰聆-0腔源楊ㄛ婓涴うblog笢眒冪衄枑善ㄩhttp://www.wirfs-brock.com/allen/posts/128
絞�閩面噩� x === 0 && 1/x === -Infinity 麼勍岆載潠等腔聆彸源楊﹝

2011/12/21 Kang-Hao (Kenny) Lu <kennyluck@w3.org>

> 餫眳坒婓 ECMAScript5 ����笢艘善賸珨��竭砉 '===' 蚚腔栳呾楊 〞
> SameValue[1]ㄛ筍岆坳躲 '===' 腔祥肮��婓黺ㄩ
>
> * SameValue(NaN, NaN) ↙ true
> * SameValue(+0, -0) ↙ false
> * SameValue(-0, +0) ↙ false
>
> ㄗ躲 '===' 眈毀ㄘ
>
> [1] http://www.w3.org/html/ig/zh/wiki/ES5#samevalue
>
> 扂旃噶賸珨狟ㄛ追政�@��磐彆褫眕蚚狟醱�@��源宒����ㄩ
>
> (function(){
>    'use strict';
>    var x = {data: +0};
>    Object.freeze(x);
>    Object.defineProperty(x, "data", {value: -0});
> })() // ��嶒﹝����飲 NaN �t祥��﹝
>
> ����賤��褫眕�Ⅶ� [[DefineOwnProperty]] 腔栳呾楊[2]ㄛ杻�e岆 10.a.ii﹝扂/
> 笨/衄褫夔褫眕祥蕞 'use strict' 躲 Object.defineProperty 酕堤�@意����ㄛ褫
> 夔猁艘艘 [[DefineOwnProperty]] 腔隙�巘萍譎硱荷N掀廌螛靼腔華源ㄗarguments
> 眳��腔ㄘㄛ祥綎祥餞鴦旃噶賸﹝�� test262[3] 掀廌抇賸�佪奿埱由e醱梑梑艘﹝
>
> [2] http://es5.github.com/#x8.12.9
> [3] http://test262.ecmascript.org/
>
> ��挲隙�瞨昤ameValue(+0, -0) 岆 false 腔埻秪�肴�躲腹�c�紫���窒��釬衄燊
> 勘ㄛ垀眕 SameValue �肴�岆郔辦腔﹝扂腔��觳岆ㄛNaN !== NaN 扂湮衙褫眕燴
> 賤ㄛ-0 === 0 腔燴蚕岆妦�N儸ˋ
>
> ㄗ婓 HTML5 ����楹莩�禍蹐���耷祥屾��������腔ㄛ��珨�c煦砅善�@��鼠嶱赩璃��
> �瞴�奻��跎問������賸珨��跎問腔 AppCache﹝價掛奻�碧e腔�侀撚奿娸���褫眕鼠
> 嶱ㄛ祥綎祥怮ь奠 QQ �熊躁標g�Cん�刳肴蘩N詻ˋ��衄ㄛ衄�]衄綃毀 QQ 腔妏蚚�l
> 瞰陛ˋ祥�輓齟�ㄛ扂珨眻岆紒腕 WHATWG IRC 螿耋腔廢��[4]��耷疑蚚腔﹝ㄘ
>
> [4] http://krijnhoetmer.nl/irc-logs/
>
>
> 森祡
>
> Kenny
>
>