浣滆€咃細DmitriPavlutin璇戣€咃細鍓嶇灏忔櫤鏉ユ簮锛歞mitripavlutin鍠滄鍐嶇湅涓€閬嶏紝鍏绘垚涔犳儻鏈枃宸叉敹褰曞湪GitHubhttps://github.com/qq44924588...鍒嗙被锛屼篃鏁寸悊浜嗗緢澶氭垜鐨勬枃妗ｅ拰鏁欑▼鏉愭枡銆傛杩庢潵鍒版槦鍜屽畬缇庛€傞潰璇曟椂鍙弬鑰冭€冪偣澶嶄範銆傛垜甯屾湜鎴戜滑鑳藉湪涓€璧枫€傚ぇ瀹堕兘璇寸畝鍘嗛噷娌￠」鐩彲鍐欙紝鎵€浠ョ粰澶у鎵句簡涓€涓」鐩紝杩樼粰浜嗕竴涓€愭惌寤烘暀绋嬨€戙€侲S2017寮曞叆浜嗗瓧绗︿覆琛ュ叏闀垮害鐨勫姛鑳姐€傚鏋滀竴涓瓧绗︿覆涓嶅闀匡紝瀹冧細鍦ㄥご閮ㄦ垨灏鹃儴瀹屾垚銆俻adStart()鐢ㄤ簬澶撮儴琛ュ叏锛宲adEnd()鐢ㄤ簬灏鹃儴琛ュ叏馃巰銆俢onststring='鍡?;string.padStart(3,'c');//"chi"string.padEnd(4,'l');//"hill"璇硶string.padStart(,)string.padEnd(,)鐞嗚В鍙傛暟padEnd鍜宲adStart鎺ュ彈鐩稿悓鐨勫弬鏁般€?.maxLength鏈€缁堝瓧绗︿覆鐨勯暱搴︺€俢onstresult=string.padStart(5);result.length;//5鐪嬪埌杩欎釜鎴戜篃瀛︿簡濂戒箙銆傛垜涓€鐩翠互涓簃axLength鏄～鍏呭瓧绗︿覆鍙傛暟鐨勯噸澶嶆鏁般€傛墍浠ヨ繖閲屾垜鍙兂寮鸿皟涓€涓嬶紝杩欎釜鍙傛暟鏄綋鍓嶅瓧绗︿覆闇€瑕佸～鍏呭埌鐨勭洰鏍囬暱搴︼紝鑰屼笉鏄～鍏呭瓧绗︿覆鐨勯噸澶嶆鏁般€傚鏋滄鏁板瓧灏忎簬褰撳墠瀛楃涓茬殑闀垮害锛屽垯杩斿洖褰撳墠瀛楃涓叉湰韬€傚綋鐒讹紝鐩镐俊璇昏€呮瘮鎴戣仾鏄庡浜嗭紝鐩镐俊澶у涓嶄細鏈夎繖涓洶鎯戰煒?.padStringpadString琛ㄧず濉厖瀛楃涓层€傚鏋滃瓧绗︿覆澶暱浠ヨ嚦浜庡～鍏呭悗鐨勫瓧绗︿覆闀垮害瓒呰繃鐩爣闀垮害锛屽垯鍙繚鐣欐渶宸﹁竟鐨勯儴鍒嗭紝鍏朵綑閮ㄥ垎灏嗚鎴柇銆傝鍙傛暟榛樿鍊间负绌烘牸""(U+0020.'hi'.padStart(5);//绛夊悓浜?hi'.padStart(5,'');濡傛灉浼犲叆绌哄瓧绗︿覆锛屽垯涓嶄細濉厖浠讳綍鍐呭銆俢onstresult='hi'.padStart(5,'');缁撴灉;//"hi"result.length;//2濡備綍澶勭悊鍏朵粬鏁版嵁绫诲瀷瀵逛簬绗簩涓弬鏁皃adString锛屽畠鎺ュ彈涓€涓瓧绗︿覆銆傚鏋滄垜浠皾璇曞皢鍏朵粬鏁版嵁绫诲瀷浼犻€掔粰瀹冦€傚畠璋冪敤toString鏂规硶灏嗗叾寮哄埗杞崲涓哄瓧绗︿覆銆傝鎴戜滑鐪嬬湅鍦ㄤ笉鍚岀殑鍊肩被鍨嬩笂浣跨敤toString鏃朵細鍙戠敓浠€涔堛€?/鏁板瓧(100).toString();//'100'//Booleantrue.toString();//'true'false.toString();//'false'//Array['A'].toString();//'A'[''].toString();//''//瀵硅薄({}).toString();//'[objectObject]'({hi:'hi'}).toString();//'[objectObject]'鏈変簡杩欎簺鐭ヨ瘑锛岃鎴戜滑鐪嬬湅鏄惁鍙互灏嗚繖浜涘叾浠栧€肩被鍨嬩紶閫掔粰padStart锛坧adEnd鍏锋湁鐩稿悓鐨勮涓猴級銆?灞卞'.padStart(8,100);//'10010SAM''SAM'.padStart(8,true);//'trueSAM''SAM'.padStart(8,false);//'falseSAM''SAM'.padStart(5,['']);//'SAM''SAM'.padStart(5,['hi']);//'hiSAM''SAM'.padStart(18,{});//'[object瀵硅薄]SAM''SAM'.padStart(18,{hi:'hi'});//'[objectObject]SAM'handlesundefined杩欓噷鏈変竴涓湁瓒ｇ殑渚嬪瓙锛屽鏋滀綘灏唘ndefined寮哄埗涓轰竴涓瓧绗︿覆锛屽緱鍒颁竴涓猅ypeError:undefined.toString();//TypeError:Cannotreadproperty'toString'ofundefined浣嗘槸褰撴垜浠皢undefined浣滀负绗簩涓弬鏁颁紶閫掔粰padStart鏃讹紝鎴戜滑寰楀埌锛?SAM'.padStart(10,undefined);//'SAM'鎵€浠ヤ笂闈㈡彁鍒扮殑padString鍙傛暟浼氱敤toString寮哄埗杞垚瀛楃涓诧紝杩欓噷鎰熻涓嶅馃檴銆傚厛鐪嬭鑼冿細ECMAScript瑙勮寖锛氬鏋滃～鍏呯殑瀛楃涓叉湭瀹氫箟锛屽垯濉厖鐨勫瓧绗︿覆灏嗘寜绌烘牸锛?x0020锛夎繘琛岃皟鑺傘€傚ソ鍚э紝鎴戜滑绾犳涓€涓嬶紝闄や簡undefined锛屽叾浠栦紶閫掔殑鏁版嵁绫诲瀷閮戒細浣跨敤toString杞垚瀛楃涓层€傚鏋減adString瓒呰繃maxLength鎬庝箞鍔烇紵濡傛灉maxLength鍊煎皬浜庢垨绛変簬褰撳墠瀛楃涓茬殑闀垮害锛屽垯杩斿洖褰撳墠瀛楃涓叉湰韬€?hi'.padEnd(2,'SAM');//'hi'濡傛灉maxLength灏忎簬padString鐨勯暱搴︼紝padString灏嗚鎴柇銆?hi'.padEnd(7,'SAMANTHA');//'hiSAMAN'padStart/padEndvspadLeft/padRighttrim鏂规硶鐨勫埆鍚嶃€倀rimLeft鏄痶rimStart鐨勫埆鍚峵rimRight鏄痶rimStart鐨勫埆鍚嶏紝浣嗗浜庡瓧绗︿覆濉厖鏂规硶锛屾病鏈夊埆鍚嶃€傛墍浠ヤ笉瑕佷娇鐢╬adLeft鍜宲adRight锛屽畠浠笉瀛樺湪銆傝繖灏辨槸涓轰粈涔堝缓璁ぇ瀹朵笉瑕佷娇鐢╰rim鍒悕锛岃繖鏍峰湪浠ｇ爜搴撲腑鏈変竴鑷存€ю煒勪娇鐢╬adStart鍙冲榻愬瓧绗︿覆console.log('JavaScript'.padStart(15));console.log('HTML'.padStart(15));console.log('CSS'.padStart(15));console.log('Vue'.padStart(15));寰楀埌鐨勭粨鏋淛avaScriptHTMLCSSVue鏁板瓧缂栫爜constbankNumber='2222222222222222';constlast4Digits=bankNumber.slice(-4);last4Digits.padStart(bankNumber.length,'*');//***************2222娴忚鍣ㄦ敮鎸乸adStart鍜宲adEnd鏄悓鏃跺紩鍏ョ殑锛屾墍浠ュ畠浠殑娴忚鍣ㄦ敮鎸佺浉浼硷紝闄や簡IE锛岄兘鍙互鐢煒€鍘熸枃锛歨ttps://dmitripavlutin.com/re...浠ｇ爜閮ㄧ讲鍚庡彲鑳藉瓨鍦ㄧ殑BUG涓嶈兘瀹炴椂鎴戠煡閬撳悗鏉ヤ负浜嗚В鍐宠繖浜汢UG锛屾垜鑺变簡寰堝鏃堕棿鍦ㄦ棩蹇楄皟璇曚笂銆傞『渚挎帹鑽愪竴涓ソ鐢ㄧ殑BUG鐩戞帶宸ュ叿锛孎undebug銆傚共璐т氦娴佺郴鍒楁枃绔犳€荤粨濡備笅銆傛垜瑙夊緱鐐逛釜Star灏卞ソ浜嗐€傛杩庡姞缇わ紝浜掔浉瀛︿範銆俬ttps://github.com/qq44924588...鎴戞槸灏忔櫤锛屽叕浼楀彿銆婂ぇ鎷涘ぉ涓嬨€嬬殑浣滆€咃紝鍓嶇鎶€鏈埍濂借€呫€傛垜浼氱粡甯稿垎浜嚜宸卞涔犵湅鍒扮殑骞茶揣锛屽湪杩涙鐨勮矾涓婁簰鐩搁紦鍔憋紒鍏虫敞鍏紬鍙凤紝鍚庡彴鍥炲绂忓埄锛屽氨鑳界湅鍒扮鍒╋紝浣犳噦鐨勩€?/p>
