String鏂规硶String绫诲瀷鏄竴涓熀鏈被鍨嬶紝瀹冪殑澧炲垹鏀规煡涓嶄細鏀瑰彉鍘熸潵鐨勫瓧绗︿覆锛岃繑鍥炰竴涓柊鐨勫瓧绗︿覆锛岀劧鍚庤繘琛屾搷浣?.extractsubstring(index1,index2)substr(start,length)slice(start,end)split(str)substring(index1,index2)lets="HelloWorld"s.substring()//HelloWorlds.substring(5)//Worlds.substring(3,-5)//Helhas鏃犲弬鏁帮細杩斿洖鍘熷瓧绗︿覆涓€涓弬鏁帮細浣滀负寮€濮嬩笅鏍囷紝缁撴潫榛樿涓哄瓧绗︿覆闀垮害浜屼釜鍙傛暟锛氳嚜鍔ㄦ瘮杈冨尯鍒嗗紑濮嬪拰缁撴潫璐熸暟锛氬拷鐣ユ垨澶勭悊鎻愬彇鐨勫瓧绗︿覆浣滀负绱㈠紩0鍖呮嫭寮€澶磋€屼笉鏄粨灏緎ubstr(start,length)lets="HelloWorld"s.substr(3,1)//ls.substr(-3,2)//rl0鍙傛暟锛氫笌substring鍑芥暟1鍙傛暟鐩稿悓锛氭敮鎸佽礋鏁颁綔涓鸿捣濮嬬储寮曚袱涓弬鏁帮細绗竴涓槸start锛岀浜屼釜鏄礋鏁發ength锛歴tart鏀寔璐熸暟锛?1鏄痩ast瀛楃锛屽綋闀垮害涓鸿礋鏁版椂锛岃繑鍥炵┖瀛楃涓瞫lice(start,end)lets="HelloWorld"s.slice(3,-6)//lo0鍜?鍙傛暟鍚宻ubstr涓や釜鍙傛暟锛歴tart鍜宔nd閮芥敮鎸佽礋鏁帮紝浣嗘槸end鐨勪綅缃笉鑳藉湪start涔嬪墠锛屽惁鍒欒繑鍥炵┖瀛楃涓瞫plit(str)lets="HelloWorld"s.split()//["HelloWorld"]s.split('l')//["He","","oWor","d"]灏嗗瓧绗︿覆杞负鏁扮粍瀛楃涓叉垨绌哄瓧绗︿覆琚垎闅斿紑锛屽垎鎴愬涓瓙涓诧紝鎶婅繖浜涘瓙涓叉斁鍒颁竴涓暟缁勪腑,骞惰繑鍥炴暟缁?.鎼滅储indexOf(str,start)lastIndexOf(str,start)startsWinth(str)endsWith(str)includes(str)charAt(index)charCodeAt(index)codePointAt(index)indexOf(str,start)lets="HelloWorld"s.indexOf()//-1s.indexOf("l")//2s.indexof("l",6)//9鏃犲弬鏁版垨鏃犲瓙涓诧紝杩斿洖-1涓や釜鍙傛暟锛氬綋start涓鸿礋鏁版椂蹇界暐鎴栭粯璁や负0锛岀┖瀛楃涓茶繑鍥瀞tartlastIndexOf(str,start)lets="HelloWorld"s.lastIndexOf("l")//9s.lastIndexOf("l",4)//3閫嗗悜鏌ユ壘锛岃繑鍥炵涓€涓尮閰嶇殑涓嬫爣璐熸暟鍩烘湰涓嶈兘鐢╯tartsWith(str)endsWith(str)lets="HelloWorld"s.startsWith()//falses.startsWith("")//true.startsWith("H")//true妫€娴嬫槸鍚︿互瀛愪覆寮€澶存垨缁撳熬锛岃繑鍥瀟rue/falsenullcharacterStringreturnstrueincludes(str)lets="HelloWorld"s.includes()//falses.includes("")//true.includes("ll")//true妫€鏌ユ槸鍚﹀寘鍚瓙瀛楃涓诧紝杩斿洖true/false绌哄瓧绗︿覆杩斿洖truecharAt(index)lets="HelloWorld"s.charAt()//Hs.charAt(0)//H鎼滅储瀛楃涓蹭腑鏌愪釜涓嬫爣涓嬬殑瀛楃榛樿涓?锛岃繑鍥炶礋鏁版垨瓒呴暱绌哄瓧绗︿覆charCodeAt(index)codePointAt(index)lets1="HelloWorld"s1.charCodeAt()//72s1.charCodeAt(0)//72lets2="馉"s.charCodeAt()//55362s.codePointAt()//134071杩斿洖鎸囧畾浣嶇疆瀛楃鐨刄nicode缂栫爜銆傞粯璁や负0銆傝礋鏁版垨瓒呰繃杩斿洖NaNcharCodeAt杩斿洖0-65535銆備袱瀛楄妭codePointAt鍙互杩斿洖鍥涘瓧鑺備唬鐮佺偣銆?.淇敼replace(str1,str2)toLowerCase()toUpperCase()trim()trimStart()trimEnd()padStart(length,str)padEnd(length,str)normalize("NFC/NFD/NFKC/NFKD")replace(娴峰场1娴峰场2)lets="HelloWorld"s.replace()//HelloWorlds.replace("World","JS")//HelloJS灏嗗瓧绗︿覆涓殑瀛愪覆鏇挎崲涓哄彟涓€涓瓧绗︿覆str1涓嶆槸鍘熷瓧绗︿覆string鐨勫瓙涓?杩斿洖鍘熷瓧绗︿覆toLowerCase()toUpperCase()lets="HelloWorld"s.toLowerCase()//helloworlds.toUpperCase()//HELLOWORLDswitchcasetrim()trimStart()trimEnd()lets="HelloWorld"s.trim()//"HelloWorld"s.trimStart()//"HelloWorld"s.trimEnd()//"HelloWorld"鍒犻櫎涓よ竟绌烘牸padStart(length,str)padEnd(length,str)lets="HelloWorld"s.padStart()//HelloWorlds.padStart(s.length,"*")//HelloWorlds.padStart(s.length+2,"*")//**HelloWorld鍦ㄥ瓧绗︿覆鐨勫紑澶存垨缁撳熬濉厖瀛楃涓蹭互杈惧埌鎸囧畾鐨勯暱搴︺€傛寚瀹氱殑闀垮害闇€瑕佸ぇ浜庡師濮嬪瓧绗︿覆鐨勯暱搴︺€傚綋padding瀛楃涓茶繃闀匡紝鍏堕暱搴︿笌鍘熷瓧绗︿覆闀垮害涔嬪拰澶т簬鎸囧畾闀垮害鏃讹紝鍙padding鐨勪竴閮ㄥ垎杩涜normalize("NFC/NFD/NFKC/NFKD")lets="\u00F1"s.normalize()//N鎸夌収鎸囧畾鐨刄nicode鑼冨紡瀵瑰綋鍓嶅瓧绗︿覆杩涜褰掍竴鍖栵紝榛樿涓篘FC4銆傛嫾鎺oncat(str)repeat(times)concat(str)lets="HelloWorld"letarr=["1","2"]console.log(s.concat(arr));//HelloWorld1,2灏唖tr鎷兼帴鎴恠锛屽鏋渟tr涓嶆槸瀛楃涓诧紝鍏堣浆鎴愬瓧绗︿覆鍐嶆嫾鎺epeat(times)lets="HelloWorld"s.repeat()//""s.repeat(2)//HelloWorldHelloWorld鏃犲弬鏁版垨鍙傛暟涓?鍒欒繑鍥炵┖瀛楃涓瞭im褰揺s涓哄皬鏁版椂锛屽悜涓嬭垗鍏ヤ负鏁存暟5.String鐨勯潤鎬佹柟娉昐tring.fromCharCode()String.fromCodePonint()String.raw()String.fromCharCode(num1,...)鍜孲tring.fromCodePoint(num1,...))letnum1=0x00BB7letnum2=0x20BB7console.log(String.fromCharCode(num1,num2));//喈粪console.log(String.fromCodePoint(num1,num2));//喈佛牣疯繖涓や釜鏂规硶缁撳悎浜嗗涓€间粠CharCode杞崲鎴愬瓧绗︿覆銆傝瘑鍒寖鍥翠负0-65535锛?xFFFF锛夈€傚鏋滆秴杩囷紝鏈€楂樹綅灏嗚蹇界暐銆?6浣嶇殑涓ゅ瓧鑺俧romCodePoint鍙互璇嗗埆涓€涓?2浣嶇殑鍥涘瓧鑺傚€糞tring.raw(callSite,...substitutions)String.raw'templateString'letname="寮犱笁"String.raw({raw:'test'},0,name)//t0e寮犱笁st//鐩稿綋浜巂t${0}e${name}st`String.raw({raw:["foo","bar","baz"]},1+1,name)//foo2bar寮犱笁bazlettmpl=`\u0BB7${name}`console.log(tmpl);//喈峰紶涓塖tring.raw`\u0BB7${name}`//\u0BB7寮犱笁String.raw`{tmpl}`//喈峰紶涓塺aw鍙互浣滀负鍥炶皟鍑芥暟瀹炵幇妯℃澘瀛楃涓插姛鑳戒絾鏄淇濊瘉鍥炶皟瀵硅薄鐨勯暱搴﹀ぇ浜巖aw鐩存帴娣诲姞鐨勬ā鏉垮弬鏁颁釜鏁版ā鏉垮瓧绗︿覆灏嗗拷鐣ヨ浆涔夊瓧绗﹀苟杩斿洖鍒板師濮嬪瓧绗︿覆
