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縺薙�繧サ繧ッ繧キ繝ァ繝ウ縺ッ縲� ECMAScript 險隱槭�髱槫�蠑上↑讎りヲ√〒讒区�縺吶k縲�
ECMAScript 縺ッ縲√�繧ケ繝育腸蠅�ク九〒縺ョ貍皮ョ怜ョ溯。後♀繧医�貍皮ョ礼噪繧ェ繝悶ず繧ァ繧ッ繝域桃菴懊�縺溘a縺ョ縲√が繝悶ず繧ァ繧ッ繝域欠蜷代�繝ュ繧ー繝ゥ繝溘Φ繧ー險隱槭〒縺ゅk縲ゅ%縺薙〒霑ー縺ケ繧� ECMAScript 縺ッ貍皮ョ礼噪縺ォ縺昴l閾ェ霄ォ縺ァ蜊∝�縺ェ繧ゅ�繧呈э蝗ウ縺励◆繧ゅ�縺ァ縺ッ縺ェ縺�; 螳溘↓縲∝、夜Κ繝��繧ソ縺ョ蜈・蜉帛所縺ウ貍皮ョ礼オ先棡縺ョ蜃コ蜉帙�縺溘a縺ォ縺ッ縲∵悽莉墓ァ倥�菴輔b謠蝉セ帙@縺ェ縺�ゆサ」繧上j縺ォ縲� ECMAScript 繝励Ο繧ー繝ゥ繝�縺ョ貍皮ョ礼腸蠅��縲∵悽莉墓ァ伜�縺ォ霑ー縺ケ繧峨l繧九が繝悶ず繧ァ繧ッ繝医→縺昴�莉悶�險ュ蛯吶�謠蝉セ帙□縺代〒縺ェ縺上� ECMAScript 繝励Ο繧ー繝ゥ繝�縺九i繧「繧ッ繧サ繧ケ蜿ッ閭ス縺ェ蛟九��繝励Ο繝代ユ繧」縺ィ蜻シ縺ウ蜃コ縺怜庄閭ス縺ェ蛟九��髢「謨ー縺ョ謠蝉セ帙@縺ヲ繧医>縺ィ遉コ縺吶%縺ィ繧帝勁縺�※譛ャ莉墓ァ倥�繧ケ繧ウ繝シ繝嶺ク翫↓隱ャ譏弱→謖ッ繧玖�縺�r謖√▽縲∝九��迺ー蠅�欠螳壹�繝帙せ繝医が繝悶ず繧ァ繧ッ繝医�謠蝉セ帙′譛溷セ�&繧後k縲�
繧ケ繧ッ繝ェ繝励ユ繧」繝ウ繧ー險隱槭�縲∵里蟄倥�繧キ繧ケ繝�Β縺ョ險ュ蛯吶r謫堺ス懊√き繧ケ繧ソ繝槭う繧コ縲∬�蜍募喧縺ォ逕ィ縺�i繧後k繝励Ο繧ー繝ゥ繝溘Φ繧ー險隱槭〒縺ゅk縲ゅ◎縺ョ繧医≧縺ェ繧キ繧ケ繝�Β縺ァ縺ッ縲√Θ繝シ繧カ繝シ繧、繝ウ繧ソ繝シ繝輔ぉ繧、繧ケ繧帝壹@縺ヲ譌「縺ォ譛臥畑縺ェ讖溯�諤ァ縺悟茜逕ィ蜿ッ閭ス縺ァ縲√せ繧ッ繝ェ繝励ユ繧」繝ウ繧ー險隱槭�繝励Ο繧ー繝ゥ繝�蛻カ蠕。縺ク縺ョ讖溯�諤ァ縺ョ髴イ蜃コ縺ョ縺溘a縺ョ繝。繧ォ繝九ぜ繝�縺ァ縺ゅk縲ゅ%縺ョ譁ケ豕輔〒縲∵里蟄倥�繧キ繧ケ繝�Β縺ッ縲√せ繧ッ繝ェ繝励ユ繧」繝ウ繧ー險隱槭�險ア螳ケ諤ァ繧呈コ縺溘☆繧ェ繝悶ず繧ァ繧ッ繝医→險ュ蛯吶�繝帙せ繝育腸蠅��謠蝉セ帙↓隧ア縺吶ゅせ繧ッ繝ェ繝励ユ繧」繝ウ繧ー險隱槭�蟆る摩逧�∪縺滄撼蟆る摩逧��繝ュ繧ー繝ゥ繝槭�荳。譁ケ縺ォ繧医k蛻ゥ逕ィ繧呈э蝗ウ縺励※縺�k縲る撼蟆る摩逧��繝ュ繧ー繝ゥ繝槭↓鬆�ソ懊☆繧九◆繧√↓縲∬ィ隱槭�謖��縺ッ縺ゅ∪繧雁宍譬シ縺ァ縺ッ縺ェ縺上※繧ゅh縺��
ECMAScript 縺ッ譛ャ譚・縲√ヶ繝ゥ繧ヲ繧カ蜀�↓縺翫>縺ヲ Web 繝壹�繧ク繧呈エサ豌嶺サ倥¢縲√◎縺励※ Web 繝吶�繧ケ縺ョ繧ッ繝ゥ繧、繧「繝ウ繝茨シ阪し繝シ繝舌い繝シ繧ュ繝�け繝√Ε縺ョ荳驛ィ縺ィ縺励※繧オ繝シ繝舌�貍皮ョ励r螳溯。後☆繧九Γ繧ォ繝九ぜ繝�繧呈署萓帙☆繧九� Web 繧ケ繧ッ繝ェ繝励ユ繧」繝ウ繧ー險隱槭→縺励※險ュ險医&繧後◆縲� ECMAScript 縺ッ讒倥�↑繝帙せ繝育腸蠅�↓繧ウ繧「縺ェ繧ケ繧ッ繝ェ繝励ユ繧」繝ウ繧ー讖溯�繧呈署萓帛庄閭ス縺ァ縺ゅj縲√◎繧後f縺域悽莉墓ァ倥〒縺ッ縲∝九��繝帙せ繝育腸蠅�°繧牙�繧企屬縺励◆繧ウ繧「縺ェ繧ケ繧ッ繝ェ繝励ユ繧」繝ウ繧ー險隱槭′隕丞ョ壹&繧後k縲�
ECMAScript 縺ョ讖溯�縺ォ縺ッ縲∽サ悶�繝励Ο繧ー繝ゥ繝溘Φ繧ー險隱槭〒菴ソ繧上l繧九b縺ョ縺ォ鬘樔シシ縺励◆驛ィ蛻�b縺ゅk; 縺ィ繧翫o縺代∵ャ。縺ォ霑ー縺ケ繧� JavaTM 縺ィ Self 縺ァ縺ゅk:
繧ヲ繧ァ繝悶ヶ繝ゥ繧ヲ繧カ縺ッ縲∽セ九∴縺ー繧ヲ繧」繝ウ繝峨え縲√Γ繝九Η繝シ縲√�繝��繧「繝��縲√ム繧、繧「繝ュ繧ー繝懊ャ繧ッ繧ケ縲√ユ繧ュ繧ケ繝医お繝ェ繧「縲√い繝ウ繧ォ繝シ縲√ヵ繝ャ繝シ繝�縲∝ア・豁エ縲√け繝�く繝シ縲∝�蜃コ蜉帙r陦ィ縺吶が繝悶ず繧ァ繧ッ繝医r蜷ォ繧縲√け繝ゥ繧、繧「繝ウ繝医し繧、繝画シ皮ョ励�縺溘a縺ョ繝帙せ繝育腸蠅�r謠蝉セ帙☆繧九ゅ&繧峨↓繝帙せ繝育腸蠅��縲√ヵ繧ゥ繝シ繧ォ繧ケ縲√�繝シ繧ク縺ィ逕サ蜒上�隱ュ縺ソ霎シ縺ソ縲��遘サ縲√お繝ゥ繝シ蜿翫�荳ュ豁「縲�∈謚槭√ヵ繧ゥ繝シ繝�騾∽ソ。縲√�繧ヲ繧ケ陦悟虚縺ョ螟画峩縺ョ繧医≧縺ェ繧、繝吶Φ繝医↓繧ケ繧ッ繝ェ繝励ユ繧」繝ウ繧ー繧ウ繝シ繝峨r蜿悶j莉倥¢繧区焔谿オ繧呈署萓帙☆繧九ゅせ繧ッ繝ェ繝励ユ繧」繝ウ繧ー繧ウ繝シ繝峨� HTML 蜀�↓蜃コ迴セ縺励√◎縺励※陦ィ遉コ縺輔l縺溘�繝シ繧ク縺ッ縲√Θ繝シ繧カ繝シ繧、繝ウ繧ソ繝シ繝輔ぉ繧、繧ケ隕∫エ�縺ィ蝗コ螳壹&繧梧シ皮ョ励&繧後◆繝�く繧ケ繝医→逕サ蜒上�邨仙粋菴薙↓縺ェ繧九ゅせ繧ッ繝ェ繝励ユ繧」繝ウ繧ー繧ウ繝シ繝峨�繝ヲ繝シ繧カ縺ョ逶ク莠剃ス懃畑縺ォ縺吶$蜿榊ソ懊@縲√Γ繧、繝ウ繝励Ο繧ー繝ゥ繝�縺ォ縺ッ蠢�ヲ√↑縺��
繧ヲ繧ァ繝悶し繝シ繝舌�繧オ繝シ繝舌し繧、繝画シ皮ョ励�縺溘a縺ョ逡ー縺ェ繧九�繧ケ繝育腸蠅�r謠蝉セ帙@縲√Μ繧ッ繧ィ繧ケ繝医√け繝ゥ繧、繧「繝ウ繝医√ヵ繧。繧、繝ォ繧定。ィ縺吶が繝悶ず繧ァ繧ッ繝医→縲√Ο繝�け縺ィ繝��繧ソ蜈ア譛峨�繝。繧ォ繝九ぜ繝�繧貞性繧縲ゅヶ繝ゥ繧ヲ繧カ繧オ繧、繝峨√し繝シ繝舌し繧、繝峨�繧ケ繧ッ繝ェ繝励ユ繧」繝ウ繧ー繧貞�縺ォ菴ソ逕ィ縺吶k縺薙→縺ァ縲仝eb 繝吶�繧ケ繧「繝励Μ繧ア繝シ繧キ繝ァ繝ウ縺ォ繧ォ繧ケ繧ソ繝槭う繧コ縺輔l縺溘Θ繝シ繧カ繝シ繧、繝ウ繧ソ繝シ繝輔ぉ繧、繧ケ繧呈署萓帙☆繧九→蜷梧凾縺ォ縲√け繝ゥ繧、繧「繝ウ繝医→繧オ繝シ繝宣俣縺ョ貍皮ョ励�蛻��繧貞庄閭ス縺ォ縺吶k縲�
ECMAScript 繧偵し繝昴�繝医☆繧� Web 繝悶Λ繧ヲ繧カ蜿翫�繧オ繝シ繝舌�縺昴l縺槭l縲� ECMAScript 螳溯。檎腸蠅�r螳梧�縺吶k閾ェ蛻��霄ォ縺ョ繝帙せ繝育腸蠅�r謠蝉セ帙☆繧九�
荳玖ィ倥� ECMAScript 縺ョ髱槫�蠑上↑讎りヲ√〒縺ゅk -- 險隱槭�縺吶∋縺ヲ縺ョ驛ィ蛻�′險倩ソー縺輔l繧九o縺代〒縺ッ縺ェ縺�ゅ%縺ョ讎りヲ√�蜴ウ蟇�↓縺ッ讓呎コ悶�荳驛ィ縺ァ縺ッ縺ェ縺��
ECMAScript 縺ッ繧ェ繝悶ず繧ァ繧ッ繝医�繝シ繧ケ縺ァ縺ゅk: 蝓コ遉守噪縺ェ險隱槭♀繧医�繝帙せ繝郁ィュ蛯吶�繧ェ繝悶ず繧ァ繧ッ繝医↓繧医▲縺ヲ謠蝉セ帙&繧後k縲ゅ∪縺溘� ECMAScript 繝励Ο繧ー繝ゥ繝�縺ッ縲�壻ソ。縺吶k繧ェ繝悶ず繧ァ繧ッ繝医�鄒、縺ァ縺ゅk縲� ECMAScript 繧ェ繝悶ず繧ァ繧ッ繝� 縺ッ縲∝コ丞�縺ョ縺ェ縺� 繝励Ο繝代ユ繧」 縺ョ髮�粋菴薙〒縲√◎繧後◇繧後�繝励Ο繝代ユ繧」縺後√◎縺ョ蛻ゥ逕ィ縺輔l縺�k譁ケ豕輔r豎コ螳壹☆繧� 0 蛟倶サ・荳翫� 螻樊ァ 繧呈戟縺、 -- 萓九∴縺ー縲√�繝ュ繝代ユ繧」縺ョ ReadOnly 螻樊ァ縺� true 縺ォ繧サ繝�ヨ縺輔l繧九→縺阪�縲√◎縺ョ繝励Ο繝代ユ繧」縺ョ蛟、繧貞、画峩縺励h縺�→縺吶k縲∝ョ溯。後&繧後k ECMAScript 繧ウ繝シ繝峨↓繧医k縺ゥ繧薙↑隧ヲ陦後b蜉ケ譫懊r謖√◆縺ェ縺�ゅ�繝ュ繝代ユ繧」縺ッ縲∽サ悶�繧ェ繝悶ず繧ァ繧ッ繝医d 繝励Μ繝溘ユ繧」繝門、 縲�繝。繧ス繝�ラ 繧剃ソ晄戟縺吶k繧ウ繝ウ繝�リ縺ァ縺ゅk縲ゅ�繝ェ繝溘ユ繧」繝悶↑蛟、縺ッ縲∵ャ。縺ョ邨�∩霎シ縺ソ 蝙�: Undefined, Null, Boolean, Number, String 縺ョ蜀��縺イ縺ィ縺、縺ョ莉イ髢薙〒縺ゅk; 繧ェ繝悶ず繧ァ繧ッ繝医�谿九j縺ョ邨�∩霎シ縺ソ 蝙� Object 縺ョ莉イ髢薙〒縺ゅk; 繝。繧ス繝�ラ縺ッ繝励Ο繝代ユ繧」邨檎罰縺ァ繧ェ繝悶ず繧ァ繧ッ繝医↓髢「騾」縺・縺代i繧後◆髢「謨ー\縺ァ縺ゅk縲�
ECMAScript 縺ッ 邨�∩霎シ縺ソ繧ェ繝悶ず繧ァ繧ッ繝� (built-in object) 縺ョ髮�粋繧貞ョ夂セゥ縺励√%繧後� ECMAScript 螳滉ス薙�螳夂セゥ繧貞ョ梧�縺吶k縲ゅ%繧後i縺ョ邨�∩霎シ縺ソ繧ェ繝悶ず繧ァ繧ッ繝医�縲;lobal 繧ェ繝悶ず繧ァ繧ッ繝医� Object 繧ェ繝悶ず繧ァ繧ッ繝医� Function 繧ェ繝悶ず繧ァ繧ッ繝医� Array 繧ェ繝悶ず繧ァ繧ッ繝医� String 繧ェ繝悶ず繧ァ繧ッ繝� Boolean 繧ェ繝悶ず繧ァ繧ッ繝医� Number 繧ェ繝悶ず繧ァ繧ッ繝医� Math 繧ェ繝悶ず繧ァ繧ッ繝医� Date 繧ェ繝悶ず繧ァ繧ッ繝医� RegExp 繧ェ繝悶ず繧ァ繧ッ繝医√◎縺励※ Error 繧ェ繝悶ず繧ァ繧ッ繝医・rror, EvalError, RangeError, ReferenceError, SyntaxError, TypeError, URIError 繧貞性繧縲�
ECMAScript 縺ッ邨�∩霎シ縺ソ縺ョ貍皮ョ怜ュ舌�繧サ繝�ヨ繧ょョ夂セゥ縺励∝宍蟇�↓縺ッ縲√◎繧後i縺ッ髢「謨ー繧�Γ繧ス繝�ラ縺ァ縺ッ縺ェ縺�°繧ゅ@繧後↑縺��ECMAScript 貍皮ョ怜ュ舌�縲√&縺セ縺悶∪縺ェ蜊倬��シ皮ョ�(unary operations), 荵鈴勁貍皮ョ怜ュ�(multiplicative operators), 蜉�貂帶シ皮ョ怜ュ�(additive operators), 繝薙ャ繝医す繝輔ヨ貍皮ョ怜ュ�(bitwise shift operators), 髢「菫よシ皮ョ怜ュ�(relational operators), 遲我セ。貍皮ョ怜ュ�(equality operators), 繝薙ャ繝域シ皮ョ怜ュ�(binary bitwise operators), 隲也炊貍皮ョ怜ュ�(binary logical operators), 莉」蜈・貍皮ョ怜ュ�(assignment operators), 繧ォ繝ウ繝樊シ皮ョ怜ュ�(comma operator) 繧貞性繧縲�
ECMAScript 讒区枚縺ッ縲∵э蝗ウ逧�↓ Java 讒区枚縺ィ莨シ縺ヲ縺�k縲� ECMAScript 讒区枚縺ッ邱ゥ繧�°縺ァ縲∝ョケ譏薙↓蛻ゥ逕ィ縺ァ縺阪k繧ケ繧ッ繝ェ繝励ユ繧」繝ウ繧ー險隱槭→縺励※縺ョ謠蝉セ帙r蜿ッ閭ス縺ォ縺励※縺�k縲ゆセ九∴縺ー縲∝、画焚縺ォ蝙句ョ」險縺ッ隕∵アゅ&繧後★縲√�繝ュ繝代ユ繧」縺ォ髢「騾」縺吶k蝙九b隕∵アゅ&繧後★縲∝ョ夂セゥ縺輔l繧矩未謨ー縺ッ縲√ユ繧ュ繧ケ繝育噪縺ォ縺昴l縺悟他縺ウ蜃コ縺輔l繧句燕縺ォ螳」險繧貞�迴セ縺輔○繧九%縺ィ繧定ヲ∵アゅ&繧後↑縺��
ECMAScript 縺ッ縲,++縲ヾmalltalk 縺ゅk縺�� Java 縺ョ繧医≧縺ェ蜴ウ蟇�↑繧ッ繝ゥ繧ケ繧呈戟縺溘↑縺�ゅ□縺後√さ繝シ繝峨�螳溯。後↓繧医j繧ェ繝悶ず繧ァ繧ッ繝医r逕滓�縺吶k繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ繧偵し繝昴�繝医@縲√%縺ョ繧ウ繝シ繝峨�繧ェ繝悶ず繧ァ繧ッ繝医↓險俶�鬆伜沺繧堤「コ菫昴@縲√が繝悶ず繧ァ繧ッ繝医�蜈ィ縺ヲ蜿医�荳驛ィ繧偵�繝ュ繝代ユ繧」縺ク縺ョ蛻晄悄蛟、莉」蜈・縺ォ繧医▲縺ヲ蛻晄悄蛹悶☆繧九ゅさ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ッ蜈ィ縺ヲ繧ェ繝悶ず繧ァ繧ッ繝医〒縺ゅk縺後√@縺九@縲√☆縺ケ縺ヲ縺ョ繧ェ繝悶ず繧ァ繧ッ繝医′繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ィ縺�≧縺薙→縺ァ縺ッ縺ェ縺�ゅさ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ッ縺昴l縺槭l prototype 繝励Ο繝代ユ繧」繧呈戟縺。縲√�繝ュ繝医ち繧、繝励�繝シ繧ケ縺ョ邯呎価縺翫h縺ウ蜈ア譛峨�繝ュ繝代ユ繧」縺ョ螳溯」�↓菴ソ逕ィ縺輔l繧九ゅが繝悶ず繧ァ繧ッ繝医� new
蠑丈クュ縺ァ縺ョ繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ菴ソ逕ィ縺ォ繧医j逕滓�縺輔l繧�; 萓九∴縺ー縲]ew String("A String") 縺ッ譁ー縺励> String 繧ェ繝悶ず繧ァ繧ッ繝医r逕滓�縺吶k縲� new
繧剃スソ逕ィ縺励↑縺�さ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ョ蜻シ蜃コ縺励�邨先棡縺ッ縲√さ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ォ萓晏ュ倥☆繧九ゆセ九∴縺ー縲� String("A String") 縺ッ縲√が繝悶ず繧ァ繧ッ繝医〒縺ッ縺ェ縺上�繝ェ繝溘ユ繧」繝悶↑譁�ュ怜�繧堤函謌舌☆繧九�
ECMAScript 縺ッ繝励Ο繝医ち繧、繝励�繝シ繧ケ縺ョ邯呎価繧偵し繝昴�繝医☆繧九ゅさ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ッ逧�未騾」縺・縺代i繧後◆繝励Ο繝医ち繧、繝励r謖√■縲√∪縺溘√◎縺ョ繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ォ菴懈�縺輔l縺溘が繝悶ず繧ァ繧ッ繝医�逧�√◎縺ョ繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ォ髢「騾」縺・縺代i繧後◆繝励Ο繝医ち繧、繝� (繧ェ繝悶ず繧ァ繧ッ繝医�繝励Ο繝医ち繧、繝励→蜻シ縺ー繧後k) 縺ォ證鈴サ吶�蜿ら�縺後≠繧九ゅ�繝ュ繝医ち繧、繝励�縲∵峩縺ォ縺昴�繝励Ο繝医ち繧、繝励↓ null 莉・螟悶�證鈴サ吶�蜿ら�縺後≠繧九°繧ゅ@繧後↑縺�(莉・荳句酔讒倥〒縺ゅk); 縺薙l縺ッ繝励Ο繝医ち繧、繝励メ繧ァ繝シ繝ウ (prototype chain) 縺ィ蜻シ縺ー繧後k縲ゅが繝悶ず繧ァ繧ッ繝医�繝励Ο繝代ユ繧」縺ク縺悟盾辣ァ縺輔l繧句�エ蜷医√◎縺ョ蜿ら�縺ッ縲√�繝ュ繝医ち繧、繝励メ繧ァ繝シ繝ウ荳ュ縺ァ縺昴�蜷榊燕縺ョ繝励Ο繝代ユ繧」繧呈戟縺、譛蛻昴�繧ェ繝悶ず繧ァ繧ッ繝医�繝励Ο繝代ユ繧」縺ク縺ョ蜿ら�縺ァ縺ゅk縲りィ縺�°縺医l縺ー縲√∪縺夂峩謗・謖�ョ壹&繧後◆繧ェ繝悶ず繧ァ繧ッ繝医′縲√◎縺ョ繝励Ο繝代ユ繧」縺ョ譛臥┌繧呈、懈渊縺輔l繧�; 縺昴�繧ェ繝悶ず繧ァ繧ッ繝医′謖�ョ壹&繧後◆繝励Ο繝代ユ繧」繧呈戟縺、蝣エ蜷医√◎繧後′蜿ら�縺吶k繝励Ο繝代ユ繧」縺ァ縺ゅk; 縺昴�繧ェ繝悶ず繧ァ繧ッ繝医′謖�ョ壹�繝励Ο繝代ユ繧」繧呈戟縺溘↑縺��エ蜷医√◎縺ョ繧ェ繝悶ず繧ァ繧ッ繝医�繝励Ο繝医ち繧、繝励′谺。縺ォ讀懈渊縺輔l繧�; 莉・荳句酔讒倥↓邯壹¥縲�
繧ッ繝ゥ繧ケ繝吶�繧ケ縺ョ繧ェ繝悶ず繧ァ繧ッ繝域欠蜷代�險隱槭〒縺ッ縲∽ク闊ャ縺ォ縲∫憾諷�(state) 縺後う繝ウ繧ケ繧ソ繝ウ繧ケ縺ォ繧医▲縺ヲ驕九�繧後√Γ繧ス繝�ラ縺ッ繧ッ繝ゥ繧ケ縺ォ繧医▲縺ヲ驕九�繧後∫カ呎価縺ッ讒矩�(strucutuer) 縺ィ謖ッ繧玖�縺�(behaviour) 縺ォ縺ョ縺ソ蟄伜惠縺吶k縲�ECMAScript縺ァ縺ッ縲∫憾諷九♀繧医�繝。繧ス繝�ラ縺後が繝悶ず繧ァ繧ッ繝医↓繧医▲縺ヲ驕九�繧後∵ァ矩�縲∵険繧玖�縺�∫憾諷九′縺吶∋縺ヲ邯呎価縺輔l繧九�
繝励Ο繝医ち繧、繝励′謖√▽繝励Ο繝代ユ繧」繧堤峩縺ォ謖√◆縺ェ縺�が繝悶ず繧ァ繧ッ繝医�縺吶∋縺ヲ縲√�繝ュ繝代ユ繧」縺ィ縺昴�蛟、繧貞�譛峨☆繧九よャ。縺ョ蝗ウ縺後%繧後r萓狗、コ縺吶k:
CF 縺ッ繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ァ縺ゅk(繧ェ繝悶ず繧ァ繧ッ繝医〒繧ゅ≠繧�)縲�5 縺、縺ョ繧ェ繝悶ず繧ァ繧ッ繝�: cf1, cf2, cf3, cf4, cf5 縺� new
蠑上�菴ソ逕ィ縺ォ繧医j菴懈�縺輔l縺ヲ縺�k縲ゅ%繧後i縺ョ繧ェ繝悶ず繧ァ繧ッ繝医�蜷���縲〈1 縺ィ q2 縺ィ縺�≧繝励Ο繝代ユ繧」繧呈戟縺、縲ら�エ邱壹�證鈴サ吶�繝励Ο繝医ち繧、繝鈴未菫ゅr陦ィ繧上☆; 縺励◆縺後▲縺ヲ縲∽セ九∴縺ー縲…f3 縺ョ繝励Ο繝医ち繧、繝励� CFp 縺ァ縺ゅk縲ゅさ繝ウ繧ケ繝医Λ繧ッ繧ソ(CF) 縺ッ縲√◎繧瑚�霄ォ縺ァ P1 縺翫h縺ウ P2 縺ィ蜷阪▼縺代i繧後◆ 2 縺、縺ョ繝励Ο繝代ユ繧」繧呈戟縺、(縺昴l縺ッ縲,Fp, cf1, cf2, cf3, cf4, cf5 縺九i縺ッ隕九∴縺ェ縺�)縲�CFp 縺ョ CFP1 縺ィ縺�≧繝励Ο繝代ユ繧」縺ッ縲� CFp 縺ョ證鈴サ吶�繝励Ο繝医ち繧、繝励メ繧ァ繝シ繝ウ荳翫〒隕九▽縺九k q1, q2, CFP1 縺ィ縺�≧蜷阪〒縺ェ縺�ササ諢上�繝励Ο繝代ユ繧」縺ァ縺ゅj縲…f1, cf2, cf3, cf4, cf5 縺ォ蜈ア譛峨&繧後k( CF 縺ォ蜈ア譛峨&繧後k縺ョ縺ァ縺ッ縺ェ縺�)縲よ囓鮟吶�繝励Ο繝医ち繧、繝励�繝ェ繝ウ繧ッ縺� CF 縺ィ CFp 縺ョ髢薙↓縺ェ縺�%縺ィ縺ォ豕ィ逶ョ縺励↑縺輔>縲�
繧ッ繝ゥ繧ケ繝吶�繧ケ縺ョ繧ェ繝悶ず繧ァ繧ッ繝郁ィ隱槭→逡ー縺ェ繧翫√�繝ュ繝代ユ繧」縺ッ蛟、縺ョ莉」蜈・縺ォ繧医▲縺ヲ縲√が繝悶ず繧ァ繧ッ繝医↓蜍慕噪縺ォ霑ス蜉�縺ァ縺阪k縲ゅ☆縺ェ繧上■縲√さ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ッ縲∵ァ狗ッ峨&繧後k繧ェ繝悶ず繧ァ繧ッ繝医�蜈ィ縺ヲ縺セ縺溘�莉サ諢上�繝励Ο繝代ユ繧」縺ョ蜻ス蜷阪d蛟、縺ョ莉」蜈・繧定ヲ∵アゅ&繧後↑縺�ゆク雁峙縺ァ縺ッ縲,Fp 蜀�〒繝励Ο繝代ユ繧」縺ォ譁ー縺溘↑蛟、繧剃サ」蜈・縺吶k縺薙→縺ァ縲…f1, cf2, cf3, cf4, cf5 縺ォ譁ー縺励>蜈ア譛峨�繝ュ繝代ユ繧」繧定ソス蜉�縺ァ縺阪k縲�
谺。縺ッ ECMAScript 縺ォ髢「騾」縺吶k骰オ縺ィ縺ェ繧玖。楢ェ槭�髱槫�蠑上↑螳夂セゥ縺ァ縺ゅk縲�
[險ウ豕ィ: 縺薙�莉墓ァ倥〒縺ッ "instance" 縺ィ縺�≧隱槭′謨」隕九☆繧九′縲� ECMAScript 縺ッ繝励Ο繝医ち繧、繝励�繝シ繧ケ險隱槭〒縺ゅj縲√%縺ョ隱槭�繧ッ繝ゥ繧ケ繝吶�繧ケ險隱槭↓縺翫¢繧� "instance" 縺ョ繧医≧縺ェ謚陦鍋噪諢丞袖繧呈戟縺溘↑縺�ら樟縺ォ莉墓ァ伜�縺ォ縺薙�隱槭↓髢「縺吶k螳夂セゥ縺ッ蜈ャ蠑城撼蜈ャ蠑丞性繧√※隕九▽縺九i縺壹∵律蟶ク隱槭→縺励※縺ョ縲悟ョ滉セ九∝ョ滉ス薙∝�菴鍋噪縺ェ繧ゅ�縲阪→縺励※縺ョ諢丞袖蜷医>縺ァ逕ィ縺�i繧後※縺�k縺ィ繧り�∴繧峨l繧九�]
蝙� (type) 縺ィ縺ッ繝��繧ソ蛟、縺ョ髮�粋縺ァ縺ゅk縲�
繝励Μ繝溘ユ繧」繝門、 (primitive value) 縺ッ Undefined, Null, Boolean, Number, String 蝙九�縺�■縺ョ荳縺、縺ョ讒区�隕∫エ�縺ァ縺ゅk縲ゅ�繝ェ繝溘ユ繧」繝門、縺ッ險隱槫ョ溯」��譛菴弱Ξ繝吶Ν縺ォ縺翫>縺ヲ逶エ謗・陦ィ縺輔l繧九ョ繝シ繧ソ縺ァ縺ゅk縲�
繧ェ繝悶ず繧ァ繧ッ繝医� Object 蝙九�讒区�隕∫エ�縺ァ縺ゅk縲ょコ丞�縺ョ縺ェ縺��繝ュ繝代ユ繧」縺ョ髮�粋菴薙〒縲√◎繧後◇繧後�繝励Ο繝代ユ繧」縺後�繝ェ繝溘ユ繧」繝門、繧�が繝悶ず繧ァ繧ッ繝医�未謨ー繧貞性繧縲ゅが繝悶ず繧ァ繧ッ繝医�繝励Ο繝代ユ繧」縺ォ譬シ邏阪&繧後◆髢「謨ー縺ッ繝。繧ス繝�ラ縺ィ蜻シ縺ー繧後k縲�
繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ィ縺ッ縲√が繝悶ず繧ァ繧ッ繝医r逕滓�縺怜�譛溷喧縺吶k Function 繧ェ繝悶ず繧ァ繧ッ繝医�縺薙→縺ァ縺ゅk縲ょ推繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ッ髢「騾」縺吶k prototype 繧ェ繝悶ず繧ァ繧ッ繝医r謖√■縲∫カ呎価縺ィ蜈ア譛峨�繝ュ繝代ユ繧」縺ョ螳溯」�↓逕ィ縺�i繧後k縲�
繝励Ο繝医ち繧、繝励�繧ェ繝悶ず繧ァ繧ッ繝医〒縺ゅj縲・CMAScript 荳ュ縺ァ縺ッ縲∵ァ矩�(structure), 迥カ諷�(state), 謖ッ繧玖�縺�(behaviour) 縺ョ邯呎価縺ォ逕ィ縺�i繧後k縲ゅさ繝ウ繧ケ繝医Λ繧ッ繧ソ縺後が繝悶ず繧ァ繧ッ繝医r逕滓�縺吶k縺ィ縺阪√�繝ュ繝代ユ繧」縺ョ蜿ら�繧定ァ」豎コ縺吶k逶ョ逧�〒縲√◎縺ョ繧ェ繝悶ず繧ァ繧ッ繝医�證鈴サ吶↓繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ォ髢「騾」縺吶k繝励Ο繝医ち繧、繝励r蜿ら�縺吶k縲ゅさ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ォ髢「騾」縺吶k繝励Ο繝医ち繧、繝励�繝励Ο繧ー繝ゥ繝�蠑� constructor.prototype 縺ァ蜿ら�縺輔l縲√が繝悶ず繧ァ繧ッ繝医�繝励Ο繝医ち繧、繝励↓霑ス蜉�縺輔l縺溘�繝ュ繝代ユ繧」縺ッ縲∫カ呎価繧帝壹@縺ヲ縲√◎縺ョ繝励Ο繝医ち繧、繝励r蜈ア譛峨☆繧句�繧ェ繝悶ず繧ァ繧ッ繝医↓繧医▲縺ヲ蜈ア譛峨&繧後k縲�
Native 繧ェ繝悶ず繧ァ繧ッ繝医�縲� ECMAScript 螳溯」�↓繧医▲縺ヲ謠蝉セ帙&繧後k莉サ諢上�繧ェ繝悶ず繧ァ繧ッ繝医〒縲√�繧ケ繝育腸蠅�↓萓晏ュ倥@縺ェ縺�よィ呎コ� Native 繧ェ繝悶ず繧ァ繧ッ繝医�譛ャ莉墓ァ倅クュ縺ァ螳夂セゥ縺輔l繧九�Native 繧ェ繝悶ず繧ァ繧ッ繝医�荳驛ィ縺ッ Built-in(邨�∩霎シ縺ソ) 縺ァ縺ゅk縲ゆサ悶�繧ゅ�縺ッ ECMAScript 繝励Ο繧ー繝ゥ繝�縺ョ螳溯。瑚。檎ィ九�髢薙↓讒狗ッ峨&繧後k縺�繧阪≧縲�
Built-in 繧ェ繝悶ず繧ァ繧ッ繝医� ECMAScript 螳溯」�↓繧医▲縺ヲ謠蝉セ帙&繧後k莉サ諢上�繧ェ繝悶ず繧ァ繧ッ繝医〒縺ゅj縲・CMAScript 繝励Ο繧ー繝ゥ繝�縺ョ螳溯。後�髢句ァ区凾縺ォ蟄伜惠縺吶k繝帙せ繝育腸蠅�↓萓晏ュ倥@縺ェ縺�よィ呎コ� Built-in 繧ェ繝悶ず繧ァ繧ッ繝医�譛ャ莉墓ァ倅クュ縺ォ螳夂セゥ縺輔l縲・CMAScript 螳溯」��莉悶r螳夂セゥ縺励※繧ゅh縺�ょ� Built-in 繧ェ繝悶ず繧ァ繧ッ繝医� Native 繧ェ繝悶ず繧ァ繧ッ繝医〒縺ゅk縲�
Host 繧ェ繝悶ず繧ァ繧ッ繝医� ECMAScript 縺ョ螳溯。檎腸蠅�r貅縺溘☆縺溘a縺ォ繝帙せ繝育腸蠅�↓繧医▲縺ヲ謠蝉セ帙&繧後k莉サ諢上�繧ェ繝悶ず繧ァ繧ッ繝医〒縺ゅk縲�Native 縺ァ縺ェ縺�ササ諢上�繧ェ繝悶ず繧ァ繧ッ繝医� Host 繧ェ繝悶ず繧ァ繧ッ繝医〒縺ゅk縲�
undefined 蛟、縺ッ縲√�繝ェ繝溘ユ繧」繝門、縺ァ縺ゅj縲∝、画焚縺ォ蛟、縺御サ」蜈・縺輔l縺ヲ縺�↑縺�→縺阪↓逕ィ縺�i繧後k縲�
Undefined 蝙九�縲∝宍蟇�↓縺ッ undefined 縺ィ蜻シ縺ー繧後k縺イ縺ィ縺、縺ョ蛟、繧貞叙繧九�
null 蛟、縺ッ縲√�繝ェ繝溘ユ繧」繝悶↑蛟、縺ァ縺ゅj縲√レ繝ォ縲∫ゥコ(empty)縲∝ュ伜惠縺励↑縺�盾辣ァ繧定。ィ縺吶�
Null 蝙九�縲∝宍蟇�↓縺ッ null 縺ィ蜻シ縺ー繧後k縺イ縺ィ縺、縺ョ蛟、繧貞叙繧九�
逵溷⊃蛟、縺ッ Boolean 蝙九�蜈� (member:髮�粋繧呈ァ区�縺吶k繧ゅ�) 縺ァ縲∽ク諢冗噪縺ェ莠後▽縺ョ蛟、縲� true 縺ィ false 縺ョ荳譁ケ縺ァ縺ゅk縲�
Boorean 蝙九�隲也炊逧�ョ滉ス薙r陦ィ縺励∝宍蟇�↓縺ッ莠後▽縺ョ荳諢冗噪縺ェ蛟、縺ァ讒区�縺輔l繧九ゆク譁ケ縺ッ true 縺ィ蜻シ縺ー繧後∽サ匁婿縺ッ false 縺ィ蜻シ縺ー繧後k縲�
Boolean 繧ェ繝悶ず繧ァ繧ッ繝医� Object 蝙九�蜈�〒縲∫オ�セシ縺ソ Boolean 繧ェ繝悶ず繧ァ繧ッ繝医�繧、繝ウ繧ケ繧ソ繝ウ繧ケ縺ァ縺ゅk縲ゅ▽縺セ繧翫� Boolean 繧ェ繝悶ず繧ァ繧ッ繝医�縲� new
蠑丞�縺ァ蠑墓焚縺ォ繝悶�繝ェ繧「繝ウ繧呈ク。縺励◆ Boolean 繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ繧堤畑縺�※菴懈�縺輔l繧九らオ先棡縺ョ繧ェ繝悶ず繧ァ繧ッ繝医�繝悶�繝ェ繧「繝ウ縺ァ縺ゅk證鈴サ吶�(辟。蜷阪�)繝励Ο繝代ユ繧」繧呈戟縺、縲� Boolean 繧ェ繝悶ず繧ァ繧ッ繝医�繝悶�繝ェ繧「繝ウ蛟、縺ォ蠑キ蛻カ縺輔l繧九�
譁�ュ怜�蛟、縺ッ String 蝙九�蜈�〒縲�0 莉・荳翫� 16 繝薙ャ繝育ャヲ蜿キ縺ェ縺玲紛謨ー蛟、縺ォ繧医k譛蛾剞縺ョ鬆�コ上≠繧九す繝シ繧ア繝ウ繧ケ縺ァ縺ゅk縲�
NOTE 蜷�、縺ッ騾壼クク蜊倅ク縺ョ UTF-16 繝�く繧ケ繝医� 16 繝薙ャ繝亥腰菴阪r縺ゅi繧上☆縺後∬ィ隱槭�縺昴l繧峨′ 16 繝薙ャ繝育ャヲ蜿キ縺ェ縺玲紛謨ー縺ァ縺ゅk縺薙→莉・螟悶�蛻カ髯舌∪縺溯ヲ∵アゅr蛟、荳翫↓險ュ鄂ョ縺励↑縺��
String 蝙九�縺吶∋縺ヲ縺ョ譁�ュ怜�蛟、縺ョ髮�粋縺ァ縺ゅk縲�
String 繧ェ繝悶ず繧ァ繧ッ繝医� Object 蝙九�蜈�〒縲∫オ�セシ縺ソ String 繧ェ繝悶ず繧ァ繧ッ繝医�繧、繝ウ繧ケ繧ソ繝ウ繧ケ縺ァ縺ゅk縲ゅ▽縺セ繧翫ヾtring 繧ェ繝悶ず繧ァ繧ッ繝医� new
蠑丞�縺ァ蠑墓焚縺ィ縺励※譁�ュ怜�繧剃セ帷オヲ縺吶k String 繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ繧堤畑縺�※逕滓�縺輔l繧九らオ先棡縺ョ繧ェ繝悶ず繧ァ繧ッ繝医�譁�ュ怜�縺ァ縺ゅk證鈴サ吶�(辟。蜷阪�)繝励Ο繝代ユ繧」繧呈戟縺、縲� String 繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ョ髢「謨ー縺ィ縺励※縺ョ蜻シ縺ウ蜃コ縺励↓繧医j縲� String 繧ェ繝悶ず繧ァ繧ッ繝医�譁�ュ怜�蛟、縺ォ蠑キ蛻カ縺輔l繧九�
謨ー蛟、縺ッ Number 蝙九�蜈�〒縲∵焚繧堤峩謗・陦ィ迴セ縺吶k縲�
Number 蝙九�謨ー繧定。ィ縺吝、縺ョ髮�粋縺ァ縺ゅk縲� ECMAScript 縺ォ縺翫>縺ヲ縲∝、縺ョ髮�粋縺ッ縲∫音谿翫↑ "Not-a-Number" (NaN) 蛟、縲∵ュ」縺ョ辟。髯仙、ァ縲∬イ�縺ョ辟。髯仙、ァ繧貞性繧√◆蛟咲イセ蠎ヲ64繝薙ャ繝亥ス「蠑� IEEE 754 蛟、縺ァ縺ゅk縲�
Number 繧ェ繝悶ず繧ァ繧ッ繝医� Object 蝙九�蜈�〒縲∫オ�セシ縺ソ Number 繧ェ繝悶ず繧ァ繧ッ繝医�繧、繝ウ繧ケ繧ソ繝ウ繧ケ縺ァ縺ゅk縲ゅ▽縺セ繧翫� Number 繧ェ繝悶ず繧ァ繧ッ繝医� new
蠑上↓縺翫>縺ヲ Number 繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ォ蠑墓焚縺ィ縺励※謨ー繧呈ク。縺励※逕滓�縺輔l繧九らオ先棡縺ョ繧ェ繝悶ず繧ァ繧ッ繝医�謨ー蟄励〒縺ゅk證鈴サ吶� (辟。蜷阪�) 繝励Ο繝代ユ繧」繧呈戟縺、縲� Number 繧ェ繝悶ず繧ァ繧ッ繝医�髢「謨ー縺ィ縺励※縺ョ Number 繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ蜻シ縺ウ蜃コ縺� (繧サ繧ッ繧キ繝ァ繝ウ 15.7.1) 縺ォ繧医▲縺ヲ謨ー蛟、縺ォ遏ッ豁」縺ァ縺阪k縲�
繝励Μ繝溘ユ繧」繝門、 Infinity 縺ッ豁」縺ョ辟。髯仙、ァ繧偵≠繧峨o縺吶ゅ%縺ョ蛟、縺ッ Number 蝙九�蜈�〒縺ゅk縲�
繝励Μ繝溘ユ繧」繝門、 NaN 縺ッ縲� IEEE 讓呎コ� "Not-a-Number" 蛟、縺ョ繧サ繝�ヨ縺ゅi繧上☆縲ゅ%縺ョ蛟、縺ッ Number 蝙九�蜈�〒縺ゅk縲�