褰诲簳寮勬噦 Unicode 缂栫爜
鍓嶈█
涓轰粈涔堣鏈夌紪鐮侊紵
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ASCII
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ASCII 鐮佷竴鍏卞畾涔変簡 128 涓瓧绗︼紝鍖呮嫭鑻辨枃瀛楁瘝 A-Z锛宎-z锛屾暟瀛� 0-9锛屼竴浜涙爣鐐圭鍙峰拰鎺у埗绗﹀彿绛夈�傝繖 128 涓瓧绗﹀彧浣跨敤浜� 8 浣嶄簩杩涘埗鏁颁腑鐨勫悗闈� 7 浣嶏紝鏈�鍓嶉潰鐨勪竴浣嶇粺涓�瑙勫畾涓� 0銆�
GB2312
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鍥犳锛孉SCII 鐮佺殑闂鍦ㄤ簬灏界鎵�鏈変汉閮藉湪 0 - 127 鍙峰瓧绗︿笂杈炬垚浜嗕竴鑷达紝浣嗗浜� 128 - 255 鍙峰瓧绗︿笂鍗存湁寰堝绉嶄笉鍚岀殑瑙ｉ噴銆備笌姝ゅ悓鏃讹紝浜氭床璇█鏈夋洿澶氱殑瀛楃闇�瑕佽瀛樺偍锛屼竴涓瓧鑺傚凡缁忎笉澶熺敤浜嗐��
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涓�涓皬浜� 127 鐨勫瓧绗︾殑鎰忎箟涓庡師鏉ョ浉鍚岋紝浣嗕袱涓ぇ浜� 127 鐨勫瓧绗﹁繛鍦ㄤ竴璧锋椂锛屽氨琛ㄧず涓�涓眽瀛楋紱
鍓嶉潰鐨勪竴涓瓧鑺傦紙浠栫О涔嬩负楂樺瓧鑺傦級浠� 0xA1 鐢ㄥ埌 0xF7锛屽悗闈竴涓瓧鑺傦紙浣庡瓧鑺傦級浠� 0xA1 鍒� 0xFE锛�
杩欐牱鎴戜滑灏卞彲浠ョ粍鍚堝嚭澶х害 7000 澶氫釜绠�浣撴眽瀛椾簡銆�
鍦ㄨ繖浜涚紪鐮侀噷锛屾垜浠繕鎶婃暟瀛︾鍙枫�佺綏椹笇鑵婄殑瀛楁瘝銆佹棩鏂囩殑鍋囧悕浠兘缂栬繘鍘讳簡锛岃繛鍦� ASCII 閲屾湰鏉ュ氨鏈夌殑鏁板瓧銆佹爣鐐广�佸瓧姣嶉兘缁熺粺閲嶆柊缂栦簡涓や釜瀛楄妭闀跨殑缂栫爜锛岃繖灏辨槸甯歌鐨� 鍏ㄨ瀛楃銆�
鑰屽師鏉ュ湪 127 鍙蜂互涓嬬殑閭ｄ簺灏卞彨 鍗婅瀛楃 浜嗐��
涓浗浜烘皯鐪嬪埌杩欐牱寰堜笉閿欙紝浜庢槸灏辨妸杩欑姹夊瓧鏂规鍙仛 GB2312銆侴B2312 鏄 ASCII 鐨勪腑鏂囨墿灞曘��
GBK
浣嗘槸涓浗鐨勬眽瀛楀お澶氫簡锛屾垜浠緢蹇氨灏卞彂鐜版湁璁稿浜虹殑浜哄悕娌℃湁鍔炴硶鍦ㄨ繖閲屾墦鍑烘潵銆備簬鏄垜浠笉寰椾笉缁х画鎶� GB2312 娌℃湁鐢ㄥ埌鐨勭爜浣嶆壘鍑烘潵鑰佸疄涓嶅姘斿湴鐢ㄤ笂銆�
鍚庢潵杩樻槸涓嶅鐢紝浜庢槸骞茶剢涓嶅啀瑕佹眰浣庡瓧鑺備竴瀹氭槸 127 鍙蜂箣鍚庣殑鍐呯爜锛屽彧瑕佺涓�涓瓧鑺傛槸澶т簬 127 灏卞浐瀹氳〃绀鸿繖鏄竴涓眽瀛楃殑寮�濮嬶紝涓嶇鍚庨潰璺熺殑鏄笉鏄墿灞曞瓧绗﹂泦閲岀殑鍐呭銆傜粨鏋滄墿灞曚箣鍚庣殑缂栫爜鏂规琚О涓� GBK 鏍囧噯锛孏BK 鍖呮嫭浜� GB2312 鐨勬墍鏈夊唴瀹癸紝鍚屾椂鍙堝鍔犱簡杩� 20000 涓柊鐨勬眽瀛楋紙鍖呮嫭绻佷綋瀛楋級鍜岀鍙枫��
GB18030 / DBCS
鍚庢潵灏戞暟姘戞棌涔熻鐢ㄧ數鑴戜簡锛屼簬鏄垜浠啀鎵╁睍锛屽張鍔犱簡鍑犲崈涓柊鐨勫皯鏁版皯鏃忕殑瀛楋紝GBK 鎵╂垚浜� GB18030銆備粠姝や箣鍚庯紝涓崕姘戞棌鐨勬枃鍖栧氨鍙互鍦ㄨ绠楁満鏃朵唬涓紶鎵夸簡銆�
涓浗鐨勭▼搴忓憳浠湅鍒拌繖涓�绯诲垪姹夊瓧缂栫爜鐨勬爣鍑嗘槸濂界殑锛屼簬鏄�氱О浠栦滑鍙仛 DBCS銆�
Double Byte Charecter Set锛氬弻瀛楄妭瀛楃闆嗐��
鍦� DBCS 绯诲垪鏍囧噯閲岋紝鏈�澶х殑鐗圭偣鏄�涓ゅ瓧鑺傞暱鐨勬眽瀛楀瓧绗﹀拰涓�瀛楄妭闀跨殑鑻辨枃瀛楃骞跺瓨浜庡悓涓�濂楃紪鐮佹柟妗堥噷锛屽洜姝や粬浠啓鐨勭▼搴忎负浜嗘敮鎸佷腑鏂囧鐞嗭紝蹇呴』瑕佹敞鎰忓瓧涓查噷鐨勬瘡涓�涓瓧鑺傜殑鍊硷紝濡傛灉杩欎釜鍊兼槸澶т簬 127 鐨勶紝閭ｄ箞灏辫涓轰竴涓弻瀛楄妭瀛楃闆嗛噷鐨勫瓧绗﹀嚭鐜颁簡銆�
鍥犱负褰撴椂鍚勪釜鍥藉閮藉儚涓浗杩欐牱鎼炲嚭涓�濂楄嚜宸辩殑缂栫爜鏍囧噯锛岀粨鏋滀簰鐩镐箣闂磋皝涔熶笉鎳傝皝鐨勭紪鐮侊紝璋佷篃涓嶆敮鎸佸埆浜虹殑缂栫爜銆�
Unicode
鏈�缁堬紝缇庡浗浜烘剰璇嗗埌浠栦滑搴旇鎻愬嚭涓�绉嶆爣鍑嗘柟妗堟潵灞曠ず涓栫晫涓婃墍鏈夎瑷�涓殑鎵�鏈夊瓧绗︼紝鍑轰簬杩欎釜鐩殑锛孶nicode 璇炵敓浜嗐��
Unicode 婧愪簬涓�涓緢绠�鍗曠殑鎯虫硶锛氬皢鍏ㄤ笘鐣屾墍鏈夌殑瀛楃鍖呭惈鍦ㄤ竴涓泦鍚堥噷锛岃绠楁満鍙鏀寔杩欎竴涓瓧绗﹂泦锛屽氨鑳芥樉绀烘墍鏈夌殑瀛楃锛屽啀涔熶笉浼氭湁涔辩爜浜嗐��
瀹冧粠 0 寮�濮嬶紝涓烘瘡涓鍙锋寚瀹氫竴涓紪鍙凤紝杩欏彨鍋氣�濈爜鐐光�濓紙code point锛夈�傛瘮濡傦紝鐮佺偣 0 鐨勭鍙峰氨鏄� null锛堣〃绀烘墍鏈変簩杩涘埗浣嶉兘鏄� 0锛夈��
U+0000 = null
涓婂紡涓紝U+琛ㄧず绱ц窡鍦ㄥ悗闈㈢殑鍗佸叚杩涘埗鏁版槸 Unicode 鐨勭爜鐐广��
杩欎箞澶氱鍙凤紝Unicode 涓嶆槸涓�娆℃�у畾涔夌殑锛岃�屾槸鍒嗗尯瀹氫箟銆�姣忎釜鍖哄彲浠ュ瓨鏀� 65536 涓紙2^16锛夊瓧绗︼紝绉颁负涓�涓钩闈紙plane锛夈�傜洰鍓嶏紝涓�鍏辨湁 17 涓钩闈�锛屼篃灏辨槸璇达紝鏁翠釜 Unicode 瀛楃闆嗙殑澶у皬鐜板湪鏄�2^21銆�
鏈�鍓嶉潰鐨� 65536 涓瓧绗︿綅锛岀О涓哄熀鏈钩闈紙缂╁啓 BMP锛夛紝瀹冪殑鐮佺偣鑼冨洿鏄粠 0 涓�鐩村埌聽2^16-1锛屽啓鎴� 16 杩涘埗灏辨槸浠� U+0000 鍒� U+FFFF銆傛墍鏈夋渶甯歌鐨勫瓧绗﹂兘鏀惧湪杩欎釜骞抽潰锛岃繖鏄� Unicode 鏈�鍏堝畾涔夊拰鍏竷鐨勪竴涓钩闈€��
鍓╀笅鐨勫瓧绗﹂兘鏀惧湪杈呭姪骞抽潰锛堢缉鍐� SMP锛夛紝鐮佺偣鑼冨洿浠� U+010000 涓�鐩村埌 U+10FFFF銆�
Unicode 鍙瀹氫簡姣忎釜瀛楃鐨勭爜鐐癸紝鍒板簳鐢ㄤ粈涔堟牱鐨勫瓧鑺傚簭琛ㄧず杩欎釜鐮佺偣锛屽氨娑夊強鍒扮紪鐮佹柟娉曘��
Unicode 缂栫爜鏂规
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0000 0080 - 0000 07FF110xxxxx 10xxxxxx
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UTF-16
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L = (c - 0x10000) % 0x400 + 0xDC00
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L = (0x1D306-0x10000) % 0x400+0xDC00 = 0xDF06
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UTF-32
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U+0000 = 0x0000 0000
U+597D = 0x0000 597D
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绛旀寰堢畝鍗曪細闈炰笉鎯充篃锛屾槸涓嶈兘涔熴�傚洜涓哄湪聽JavaScript 璇█鍑虹幇鐨勬椂鍊欙紝杩樻病鏈� UTF-16 缂栫爜銆�
JavaScript 瀛楃鍑芥暟鐨勫眬闄�
鐢变簬 JavaScript 鍙兘澶勭悊 UCS-2 缂栫爜锛岄�犳垚鎵�鏈夊瓧绗﹀湪杩欓棬璇█涓兘鏄� 2 涓瓧鑺傦紝濡傛灉鏄� 4 涓瓧鑺傜殑瀛楃锛屼細褰撲綔涓や釜鍙屽瓧鑺傜殑瀛楃澶勭悊銆侸avaScript 鐨勫瓧绗﹀嚱鏁伴兘鍙楀埌杩欎竴鐐圭殑褰卞搷锛屾棤娉曡繑鍥炴纭粨鏋溿��
浠モ�濔潓嗏�濆瓧绗︿负渚嬶紝瀹冪殑 UTF-16 缂栫爜鏄� 4 涓瓧鑺傜殑 0xD834 0xDF06銆傞棶棰樺氨鏉ヤ簡锛�4 涓瓧鑺傜殑缂栫爜涓嶅睘浜� UCS-2锛孞avaScript 涓嶈璇嗭紝鍙細鎶婂畠鐪嬩綔鍗曠嫭鐨勪袱涓瓧绗� U+D834 鍜� U+DF06銆傚墠闈㈣杩囷紝杩欎袱涓爜鐐规槸绌虹殑锛屾墍浠� JavaScript 浼氳涓烘槸涓や釜鈥濓拷鈥濆瓧绗︾粍鎴愮殑瀛楃涓诧紒
"饾寙".length
// 2
'\u1D306' === '饾寙'
// false
"饾寙".charAt(0)
// "锟�"
"饾寙".charCodeAt(0)
// 55348(0xD834)
"饾寙" === '\uD834\uDF06'
// true
涓婇潰浠ｇ爜琛ㄧず锛孞avaScript 璁や负瀛楃鐨勯暱搴︽槸 2锛屽彇鍒扮殑绗竴涓瓧绗︽槸绌哄瓧绗︼紝鍙栧埌鐨勭涓�涓瓧绗︾殑鐮佺偣鏄� 0xDB34銆傝繖浜涚粨鏋滈兘涓嶆纭紒
瑙ｅ喅杩欎釜闂锛屽繀椤诲鐮佺偣鍋氫竴涓垽鏂紝鐒跺悗鎵嬪姩璋冩暣銆備笅闈㈡槸姝ｇ‘鐨勯亶鍘嗗瓧绗︿覆鐨勫啓娉曘��
while (++index < length) {
聽 // ...
聽 if (charCode >= 0xD800 && charCode <= 0xDBFF) {
聽 聽 output.push(character + string.charAt(++index));
聽 } else {
聽 聽 output.push(character);
聽 }
}
绫讳技鐨勯棶棰樺瓨鍦ㄤ簬鎵�鏈夌殑 JavaScript 瀛楃鎿嶄綔鍑芥暟銆�
String.prototype.replace()
String.prototype.substring()
String.prototype.slice()
...
涓婇潰鐨勫嚱鏁伴兘鍙 2 瀛楄妭鐨勭爜鐐规湁鏁堛�傝姝ｇ‘澶勭悊 4 瀛楄妭鐨勭爜鐐癸紝灏卞繀椤婚�愪竴閮ㄧ讲鑷繁鐨勭増鏈紝鍒ゆ柇涓�涓嬪綋鍓嶅瓧绗︾殑鐮佺偣鑼冨洿銆�
ECMAScript 6 涓 Unicode 鐨勬墿灞�
瀛楃鐨� Unicode 琛ㄧず娉�
ES6 鍔犲己浜嗗 Unicode 鐨勬敮鎸侊紝鍏佽閲囩敤\uxxxx 褰㈠紡琛ㄧず涓�涓瓧绗︼紝鍏朵腑 xxxx 琛ㄧず瀛楃鐨� Unicode 鐮佺偣銆�
"\u0061"
// "a"
浣嗘槸锛岃繖绉嶈〃绀烘硶鍙檺浜庣爜鐐瑰湪\u0000~\uFFFF 涔嬮棿鐨勫瓧绗︺�傝秴鍑鸿繖涓寖鍥寸殑瀛楃锛屽繀椤荤敤涓や釜鍙屽瓧鑺傜殑褰㈠紡琛ㄧず銆�
"\uD842\uDFB7"
// "馉"
"\u20BB7"
// "鈧�7"
涓婇潰浠ｇ爜琛ㄧず锛屽鏋滅洿鎺ュ湪\u 鍚庨潰璺熶笂瓒呰繃 0xFFFF 鐨勬暟鍊硷紙姣斿\u20BB7锛夛紝JavaScript 浼氱悊瑙ｆ垚\u20BB+7銆傛墍浠ヤ細鏄剧ず涓�涓叾浠栧瓧绗︼紝鍚庨潰璺熺潃涓�涓� 7銆�
ES6 瀵硅繖涓�鐐瑰仛鍑轰簡鏀硅繘锛屽彧瑕佸皢鐮佺偣鏀惧叆澶ф嫭鍙凤紝灏辫兘姝ｇ‘瑙ｈ璇ュ瓧绗︺��
"\u{20BB7}"
// "馉"
"\u{41}\u{42}\u{43}"
// "ABC"
let hello = 123;
hell\u{6F} // 123
'\u{1F680}' === '\uD83D\uDE80'
// true
涓婇潰浠ｇ爜涓紝鏈�鍚庝竴涓緥瀛愯〃鏄庯紝澶ф嫭鍙疯〃绀烘硶涓庡洓瀛楄妭鐨� UTF-16 缂栫爜鏄瓑浠风殑銆�
鏈変簡杩欑琛ㄧず娉曚箣鍚庯紝JavaScript 鍏辨湁 6 绉嶆柟娉曞彲浠ヨ〃绀轰竴涓瓧绗︺��
'\z' === 'z'聽 // true
'\172' === 'z' // true
'\x7A' === 'z' // true
'\u007A' === 'z' // true
'\u{7A}' === 'z' // true
瀛楃涓茬殑閬嶅巻鍣ㄦ帴鍙�
ES6 涓哄瓧绗︿覆娣诲姞浜嗛亶鍘嗗櫒鎺ュ彛锛屼娇寰楀瓧绗︿覆鍙互琚� for鈥f 寰幆閬嶅巻銆�
for (let codePoint of 'foo') {
聽 console.log(codePoint)
}
// "f"
// "o"
// "o"
闄や簡閬嶅巻瀛楃涓诧紝杩欎釜閬嶅巻鍣ㄦ渶澶х殑浼樼偣鏄彲浠ヨ瘑鍒ぇ浜� 0xFFFF 鐨勭爜鐐癸紝浼犵粺鐨� for 寰幆鏃犳硶璇嗗埆杩欐牱鐨勭爜鐐广��
let text = String.fromCodePoint(0x20BB7);
for (let i = 0; i < text.length; i++) {
聽 console.log(text[i]);
}
// " "
// " "
for (let i of text) {
聽 console.log(i);
}
// "馉"
涓婇潰浠ｇ爜涓紝瀛楃涓� text 鍙湁涓�涓瓧绗︼紝浣嗘槸 for 寰幆浼氳涓哄畠鍖呭惈涓や釜瀛楃锛堥兘涓嶅彲鎵撳嵃锛夛紝鑰� for鈥f 寰幆浼氭纭瘑鍒嚭杩欎竴涓瓧绗︺��
鐩存帴杈撳叆 U+2028 鍜� U+2029
JavaScript 瀛楃涓插厑璁哥洿鎺ヨ緭鍏ュ瓧绗︼紝浠ュ強杈撳叆瀛楃鐨勮浆涔夊舰寮忋�備妇渚嬫潵璇达紝鈥滀腑鈥濈殑 Unicode 鐮佺偣鏄� U+4e2d锛屼綘鍙互鐩存帴鍦ㄥ瓧绗︿覆閲岄潰杈撳叆杩欎釜姹夊瓧锛屼篃鍙互杈撳叆瀹冪殑杞箟褰㈠紡\u4e2d锛屼袱鑰呮槸绛変环鐨勩��
'涓�' === '\u4e2d' // true
浣嗘槸锛孞avaScript 瑙勫畾鏈� 5 涓瓧绗︼紝涓嶈兘鍦ㄥ瓧绗︿覆閲岄潰鐩存帴浣跨敤锛屽彧鑳戒娇鐢ㄨ浆涔夊舰寮忋��
U+005C锛氬弽鏂滄潬锛坮everse solidus)
U+000D锛氬洖杞︼紙carriage return锛�
U+2028锛氳鍒嗛殧绗︼紙line separator锛�
U+2029锛氭鍒嗛殧绗︼紙paragraph separator锛�
U+000A锛氭崲琛岀锛坙ine feed锛�
涓句緥鏉ヨ锛屽瓧绗︿覆閲岄潰涓嶈兘鐩存帴鍖呭惈鍙嶆枩鏉狅紝涓�瀹氳杞箟鍐欐垚\鎴栬�匼u005c銆�
杩欎釜瑙勫畾鏈韩娌℃湁闂锛岄夯鐑﹀湪浜� JSON 鏍煎紡鍏佽瀛楃涓查噷闈㈢洿鎺ヤ娇鐢� U+2028锛堣鍒嗛殧绗︼級鍜� U+2029锛堟鍒嗛殧绗︼級銆傝繖鏍蜂竴鏉ワ紝鏈嶅姟鍣ㄨ緭鍑虹殑 JSON 琚� JSON.parse 瑙ｆ瀽锛屽氨鏈夊彲鑳界洿鎺ユ姤閿欍��
const json = '"\u2028"';
JSON.parse(json); // 鍙兘鎶ラ敊
JSON 鏍煎紡宸茬粡鍐荤粨锛圧FC 7159锛夛紝娌℃硶淇敼浜嗐�備负浜嗘秷闄よ繖涓姤閿欙紝ES2019 鍏佽 JavaScript 瀛楃涓茬洿鎺ヨ緭鍏� U+2028锛堣鍒嗛殧绗︼級鍜� U+2029锛堟鍒嗛殧绗︼級銆�
const PS = eval(鈥溾�榎u2029鈥欌��); 鏍规嵁杩欎釜鎻愭锛屼笂闈㈢殑浠ｇ爜涓嶄細鎶ラ敊銆�
娉ㄦ剰锛屾ā鏉垮瓧绗︿覆鐜板湪灏卞厑璁哥洿鎺ヨ緭鍏ヨ繖涓や釜瀛楃銆傚彟澶栵紝姝ｅ垯琛ㄨ揪寮忎緷鐒朵笉鍏佽鐩存帴杈撳叆杩欎袱涓瓧绗︼紝杩欐槸娌℃湁闂鐨勶紝鍥犱负 JSON 鏈潵灏变笉鍏佽鐩存帴鍖呭惈姝ｅ垯琛ㄨ揪寮忋��
JSON.stringify() 鐨勬敼閫�
鏍规嵁鏍囧噯锛�JSON 鏁版嵁蹇呴』鏄� UTF-8 缂栫爜銆備絾鏄紝鐜板湪鐨� JSON.stringify()鏂规硶鏈夊彲鑳借繑鍥炰笉绗﹀悎 UTF-8 鏍囧噯鐨勫瓧绗︿覆銆�
鍏蜂綋鏉ヨ锛孶TF-8 鏍囧噯瑙勫畾锛�0xD800 鍒� 0xDFFF 涔嬮棿鐨勭爜鐐癸紝涓嶈兘鍗曠嫭浣跨敤锛屽繀椤婚厤瀵逛娇鐢ㄣ�傛瘮濡傦紝\uD834\uDF06 鏄袱涓爜鐐癸紝浣嗘槸蹇呴』鏀惧湪涓�璧烽厤瀵逛娇鐢紝浠ｈ〃瀛楃 饾寙銆傝繖鏄负浜嗚〃绀虹爜鐐瑰ぇ浜� 0xFFFF 鐨勫瓧绗︾殑涓�绉嶅彉閫氭柟娉曘�傚崟鐙娇鐢╘uD834 鍜孿uDFO6 杩欎袱涓爜鐐规槸涓嶅悎娉曠殑锛屾垨鑰呴鍊掗『搴忎篃涓嶈锛屽洜涓篭uDF06\uD834 骞舵病鏈夊搴旂殑瀛楃銆�
JSON.stringify()鐨勯棶棰樺湪浜庯紝瀹冨彲鑳借繑鍥� 0xD800 鍒� 0xDFFF 涔嬮棿鐨勫崟涓爜鐐广��
JSON.stringify('\u{D834}') // "\u{D834}"
涓轰簡纭繚杩斿洖鐨勬槸鍚堟硶鐨� UTF-8 瀛楃锛孍S2019 鏀瑰彉浜� JSON.stringify()鐨勮涓恒�傚鏋滈亣鍒� 0xD800 鍒� 0xDFFF 涔嬮棿鐨勫崟涓爜鐐癸紝鎴栬�呬笉瀛樺湪鐨勯厤瀵瑰舰寮忥紝瀹冧細杩斿洖杞箟瀛楃涓诧紝鐣欑粰搴旂敤鑷繁鍐冲畾涓嬩竴姝ョ殑澶勭悊銆�
JSON.stringify('\u{D834}') // ""\\uD834""
JSON.stringify('\uDF06\uD834') // ""\\udf06\\ud834""
瀛楃涓插鐞嗗嚱鏁�
ES6 鏂板浜嗗嚑涓笓闂ㄥ鐞� 4 瀛楄妭鐮佺偣鐨勫嚱鏁般��
String.fromCodePoint()锛氫粠 Unicode 鐮佺偣杩斿洖瀵瑰簲瀛楃
鍥犱负 fromCodePoint() 鏄� String 鐨勪竴涓潤鎬佹柟娉曪紝鎵�浠ュ彧鑳介�氳繃 String.fromCodePoint() 杩欐牱鐨勬柟寮忔潵浣跨敤锛屼笉鑳藉湪浣犲垱寤虹殑 String 瀵硅薄瀹炰緥涓婄洿鎺ヨ皟鐢ㄣ��
String.fromCodePoint(42);聽 聽 聽 // "*"
String.fromCodePoint(65, 90);聽 // "AZ"
String.fromCodePoint(0x404);聽 聽 // "\u0404"
String.fromCodePoint(0x2F804);聽 // "\uD87E\uDC04"
String.fromCodePoint(194564);聽 // "\uD87E\uDC04"
String.fromCodePoint(0x1D306, 0x61, 0x1D307) // "\uD834\uDF06a\uD834\uDF07"
String.fromCodePoint('_');聽 聽 聽 // RangeError
String.fromCodePoint(Infinity); // RangeError
String.fromCodePoint(-1);聽 聽 聽 // RangeError
String.fromCodePoint(3.14);聽 聽 // RangeError
String.fromCodePoint(3e-2);聽 聽 // RangeError
String.fromCodePoint(NaN);聽 聽 聽 // RangeError
String.prototype.codePointAt()锛氫粠瀛楃杩斿洖瀵瑰簲鐨勭爜鐐�
濡傛灉鍦ㄦ寚瀹氱殑浣嶇疆娌℃湁鍏冪礌鍒欒繑鍥� undefined 銆傚鏋滃湪绱㈠紩澶勫紑濮嬫病鏈� UTF-16 浠ｇ悊瀵癸紝灏嗙洿鎺ヨ繑鍥炲湪閭ｄ釜绱㈠紩澶勭殑缂栫爜鍗曞厓銆�
Surrogate Pair 鏄� UTF-16 涓敤浜庢墿灞曞瓧绗﹁�屼娇鐢ㄧ殑缂栫爜鏂瑰紡锛屾槸涓�绉嶉噰鐢ㄥ洓涓瓧鑺�(涓や釜 UTF-16 缂栫爜)鏉ヨ〃绀轰竴涓瓧绗︼紝绉颁綔浠ｇ悊瀵广��
'ABC'.codePointAt(1);聽 聽 聽 聽 聽 // 66
'\uD800\uDC00'.codePointAt(0); // 65536
'XYZ'.codePointAt(42); // undefined
姝ｅ垯琛ㄨ揪寮�
ES6 鎻愪緵浜� u 淇グ绗︼紝瀵规鍒欒〃杈惧紡娣诲姞 4 瀛楄妭鐮佺偣鐨勬敮鎸併��
/^.$/.test('饾寙')
false
/^.$/u.test('饾寙')
true
Unicode 姝ｈ鍖�
鏈変簺瀛楃闄や簡瀛楁瘝浠ュ锛岃繕鏈夐檮鍔犵鍙枫�傛瘮濡傦紝姹夎鎷奸煶鐨� 菓锛屽瓧姣嶄笂闈㈢殑澹拌皟灏辨槸闄勫姞绗﹀彿銆傚浜庤澶氭娲茶瑷�鏉ヨ锛屽０璋冪鍙锋槸闈炲父閲嶈鐨勩��
Unicode 鎻愪緵浜嗕袱绉嶈〃绀烘柟娉曘�備竴绉嶆槸甯﹂檮鍔犵鍙风殑鍗曚釜瀛楃锛屽嵆涓�涓爜鐐硅〃绀轰竴涓瓧绗︼紝姣斿 菓 鐨勭爜鐐规槸 U+01D1锛涘彟涓�绉嶆槸灏嗛檮鍔犵鍙峰崟鐙綔涓轰竴涓爜鐐癸紝涓庝富浣撳瓧绗﹀鍚堟樉绀猴紝鍗充袱涓爜鐐硅〃绀轰竴涓瓧绗︼紝姣斿 菓 鍙互鍐欐垚 O锛圲+004F锛� + 藝锛圲+030C锛夈��
// 鏂规硶涓�
'\u01D1'
// '菓'
// 鏂规硶浜�
'\u004F\u030C'
// '菓'
杩欎袱绉嶈〃绀烘柟娉曪紝瑙嗚鍜岃涔夐兘瀹屽叏涓�鏍凤紝鐞嗗簲浣滀负绛夊悓鎯呭喌澶勭悊銆備絾鏄紝JavaScript 鏃犳硶杈ㄥ埆銆�
'\u01D1'==='\u004F\u030C'
//false
ES6 鎻愪緵浜� normalize 鏂规硶锛屽厑璁糕�漊nicode 姝ｈ鍖栤�濓紝鍗冲皢涓ょ鏂规硶杞负鍚屾牱鐨勫簭鍒椼��
'\u01D1'.normalize() === '\u004F\u030C'.normalize()
// true
Emoji 琛ㄦ儏绗﹀彿鐨勫偍瀛�
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