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e.log(true&&false)//falseconsole.log(false&&true)//falseconsole.log(false&&false)//濡傛灉宸︽搷浣滄暟琚浆鎹㈠鏋滃竷灏旂被鍨嬬殑鍊煎悗闈㈢殑鍊间负鐪燂紝鍒欒繑鍥炲彸鎿嶄綔鏁般€傚鏋滃乏鎿嶄綔鏁拌浆鎹负boolean绫诲瀷鐨勫€间负false锛屽垯鐩存帴杩斿洖宸︽搷浣滄暟銆?鍊煎緱娉ㄦ剰鐨勬槸锛屽鏋滄娴嬪埌宸﹁竟鐨勫€间负false锛屽垯鐩存帴杩斿洖缁撴灉锛屼笉浼氱户缁悜涓嬫墽琛岋紙瀹為檯寮€鍙戜腑鏈夌敤锛夈€傜ず渚嬩唬鐮佸涓嬶細console.log(1&&2)//2console.log(0&&1)//0console.log(1&&'')//''console.log(true&&'str')//'str'//杩欓噷浣跨敤浜嗕竴涓湭瀹氫箟鐨勫彉閲忓€硷紝濡傛灉妫€娴嬪埌宸﹁竟鐨勫€间负false锛屽垯涓嶄細缁х画鎵ц锛屽惁鍒欎細鎶ラ敊锛岄敊璇俊鎭负锛歷alueisnotdefinedconsole.log(false&&value)//false閫昏緫鎴栬繍绠楃||閫昏緫鎴栬繍绠楃浣跨敤涓や釜|symbols琛ㄧず瀹冪殑浣滅敤涔熸槸瀵逛袱涓搷浣滄暟锛坥perands锛夎繘琛岃繍绠楋紝骞惰繑鍥炰竴涓竷灏斿€笺€傞€昏緫鎴栫殑璁＄畻瑙勫垯濡備笅锛氬鏋滃乏鎿嶄綔鏁扮殑鍊间负鐪燂紝鍒欐渶缁堢粨鏋滀负鐪燂紱濡傛灉宸︽搷浣滄暟鐨勫€间负鍋囷紝鍒欐渶缁堢粨鏋滀负鍙虫搷浣滄暟锛涘鏋滃乏鎿嶄綔鏁拌浆鎹负甯冨皵绫诲瀷鐨勫€间负鐪燂紝鍒欒繑鍥炲乏渚х殑鎿嶄綔鏁般€傚鏋滆浆鎹负甯冨皵绫诲瀷鍊肩殑宸︽搷浣滄暟鐨勫€间负false锛屽垯杩斿洖鍙虫搷浣滄暟銆傜ず渚嬩唬鐮佸涓嬶細console.log(true||true)//trueconsole.log(true||false)//trueconsole.log(false||true)//trueconsole.log(false||false)//鍋囨帶鍒跺彴銆俵og(1||2)//1console.log(0||1)//1console.log(1||'')//1console.log(true||'str')//true璧嬪€艰繍绠楃璧嬪€艰繍绠楃灏辨槸灏嗗彸杈硅〃杈惧紡鐨勮绠楃粨鏋滆祴鍊肩粰宸﹁竟鐨勫彉閲忋€傛垜浠箣鍓嶄娇鐢ㄧ殑=鏄祴鍊艰繍绠楃銆侸avaScript涓櫎浜嗚繖涓繍绠楃涔嬪锛岃繕鏈変互涓嬭祴鍊艰繍绠楃銆傚叾涓紝闄?鍙峰锛屽叾浣欑粺绉颁负澶嶅悎璧嬪€艰繍绠楃銆傚鍚堣祴鍊艰繍绠楃鎵€璋撳鍚堣祴鍊艰繍绠楃鏄畻鏈繍绠楃鍜岃祴鍊艰繍绠楃鐨勭畝绉般€傝繖閲屾垜浠互鍔犳硶璧嬪€艰繍绠楃涓轰緥銆傝娉曠粨鏋勫涓嬶細x+=y涓婇潰鐨勮娉曞拰x=x+y涓€鏍凤紝涔熷氨鏄锛屾墍璋撳鍚堟暟鍊艰繍绠楃灏辨槸瀵瑰彸鎿嶄綔鏁帮紙operand)鍜屽乏鎿嶄綔鏁?operand)锛屽苟灏嗚绠楃粨鏋滆祴鍊肩粰宸︽搷浣滄暟銆傜ず渚嬩唬鐮佸涓嬶細varnum=10varresult1=20varresult2=20//鍔犳硶璧嬪€艰繍绠楃result1+=numresult2=result2+numconsole.log(result1===result2)//true//鍑忔硶璧嬪€艰繍绠楃result1-=numresult2=result2-numconsole.log(result1===result2)//true//绱㈠紩璧嬪€艰繍绠楃result1**=numresult2=result2**numconsole.log(result1===result2)//true閾捐祴鍊糐avaScript璇█鏄粈涔堟槸鏀寔閾惧紡璧嬪€肩殑閾惧紡璧嬪€硷紵鐪嬩笅闈唬鐮佸氨鐭ラ亾vara=10varb=20a+=b-=10console.log(a)//20涓摼寮忚祴鍊硷紝浠庡彸鍒板乏渚濇璧嬪€笺€傚湪涓婇潰鐨勪唬鐮佷腑锛屾垜浠厛璁＄畻鍑篵-=10鐨勫€硷紝璧嬪€肩粰b锛岀劧鍚庤绠梐+=b锛屾墍浠ユ渶鍚庣殑缁撴灉鏄?0銆傝繕鏈変竴浜涚壒娈婄殑杩愯惀鍟嗐€備粬浠€绘槸瀛ゅ啗濂嬫垬锛屼絾鍦ㄥ疄闄呭彂灞曚腑鍗撮潪甯搁噸瑕併€傜湅鐪嬮兘鍖呮嫭鍝簺鏉′欢杩愮畻绗︼紵锛欽avaScript涓殑鏉′欢杩愮畻绗︽槸JavaScript涓敮涓€鐨勪笁鍏冭繍绠楃銆傚叾璇硶缁撴瀯濡備笅锛氭潯浠讹紵Value1:Value2褰撴潯浠朵负鐪熸垨鍙互绫诲瀷杞崲涓虹湡鏃讹紝璇ヨ〃杈惧紡杩斿洖鐨勭粨鏋滀负鍊?锛屽惁鍒欒琛ㄨ揪寮忚繑鍥炲€?銆傜ず渚嬩唬鐮佸涓嬶細varage=20varresult=骞撮緞>18宀侊紵'adult':'minor'console.log(result)//鍦ㄤ笂闈㈤拡瀵规垚浜虹殑浠ｇ爜涓紝鐢变簬鎴戜滑鐨勫彉閲廰ge鐨勫€间负20锛屽畠鏄ぇ浜?8鐨勶紝鎵€浠ヨ繖涓〃杈惧紡閮ㄥ垎鐨勭粨鏋滀负鐪燂紝鏈€鍚庡皢鎴愪汉鍒嗛厤缁欑粨鏋滃彉閲忋€傛潯浠惰繍绠楃閾惧紡鏉′欢杩愮畻绗︿笉浠呮槸鍞竴鐨勪笁鍏冭繍绠楃锛岃€屼笖鏄潯浠惰繍绠楃鐨勭涓変釜琛ㄨ揪寮忓叕寮忎篃鍙互鏄潯浠惰繍绠楃锛屼互姝ょ被鎺紝褰㈡垚涓€涓摼銆傝繖绉颁负鏉′欢杩愮畻绗﹂摼鎺ャ€傜ず渚嬩唬鐮佸涓嬶細varscore=85varresult=score>=90?'浼樼'锛氬緱鍒?=80?鈥滃ソ鈥濓細寰楀垎>=60?'Qualified':'Unqualified'console.log(result)//Good鍦ㄤ笂闈㈢殑浠ｇ爜涓紝鍏堟墽琛岃〃杈惧紡score>=90鐨勭粨鏋滀负false锛屾墍浠ユ墽琛宍score>=80?'濂?锛氬垎鏁?=60?'qualified':'failure'锛屾墽琛岃繖涓〃杈惧紡褰撲娇鐢ㄨ繖涓〃杈惧紡鏃讹紝鍏堟墽琛岃〃杈惧紡score>=80锛岀粨鏋滀负鐪燂紝鎵€浠ユ渶鍚庣殑缁撴灉鏄ソ鐨勩€傚鏋滆繖涓〃杈惧紡鐨勭粨鏋滆繕鏄痜alse锛屽氨浼氫緷娆℃墽琛屻€傛潯浠惰繍绠楃閾句篃绉颁负鏉′欢杩愮畻绗︾殑宓屽缁撴瀯銆侸avaScript涓殑鍒嗙粍杩愮畻绗?)()鏄垎缁勮繍绠楃锛屽湪鎵€鏈夎繍绠楃涓紭鍏堢骇鏈€楂樸€傝繖涓繍绠楃娌℃湁鍒殑鎰忔€濓紝涓昏鏄彲浠ヨ鏌愪簺琛ㄨ揪寮忓厛鎵ц銆傜ず渚嬩唬鐮佸涓嬶細varresult1=1+2*3/4%5**6/***涓婇潰鐨勬墽琛岄『搴忔槸*鎸囨暟杩愮畻绗︾殑鎵ц椤哄簭鏄?6锛屽厛鎵ц5**6鐨勭粨鏋滀负15625*涔橀櫎鍙栨ā鎵ц椤哄簭涓?5锛岃繖閲屼粠2寮€濮嬩粠宸﹀埌鍙充緷娆℃墽琛?3*鏈€缁堣绠楁墽琛岄『搴忎负14鍔犳硶*/console.log(result1)//濡傛灉璁＄畻涓?)鍒嗙粍锛屽彲浠ュ緱鍒颁笉鍚岀殑鐩稿悓缁撴灉varresult2=((1+2)*3/4%5)**6/***杩欓噷鎴戜滑鍙互鐢?)浠庡乏鍒板彸渚濇鎵ц*/console.log(result2,)ES6鐨勬柊杩愮畻绗︼紙鎵╁睍鍐呭锛夊湪ES6涓鍔犱簡寰堝鏂扮殑杩愮畻绗︺€傝繖閲屽皢浠嬬粛涓€浜涘父鐢ㄧ殑鎿嶄綔绗︼紝濡備笅鍥炬墍绀猴細娉細杩欓噷鐨凟S6鍙槸涓€涓粺绉帮紝鍗矱CMAScript2015涔嬪悗鐨勭増鏈粺绉颁负ES6銆傝繖閲屼粙缁嶄竴浜涚洰鍓嶆病鏈夋帴瑙﹀埌鐨勫唴瀹癸紝姣斿鏁扮粍锛屽璞°€傚湪杩欓噷璁板綍杩欎簺鎿嶄綔绗︾殑鐩殑鏄负浜嗚杩欑瘒鏂囩珷鏇村叿鏀惰棌浠峰€笺€係preadoperator...灞曞紑杩愮畻绗︿负涓変釜鐐癸紙...锛夛紝灞曞紑杩愮畻绗﹀垎涓哄璞″睍寮€杩愮畻绗﹀拰鏁扮粍灞曞紑杩愮畻绗︺€傛暟缁勬墿灞曡繍绠楃鏁扮粍鎵╁睍杩愮畻绗︾敤浜庡皢鏁扮粍杞崲涓轰互閫楀彿鍒嗛殧鐨勫弬鏁板垪琛紝绀轰緥浠ｇ爜濡備笅锛?/瀹氫箟涓€涓暟缁剉ararr=[1,2,3,4,5]console.log(...arr)//12345//涔嬫墍浠ュ湪杩欓噷寰楀埌12345鏄洜涓烘垜浠妸鏁扮粍灞曞紑鎴愪竴涓敤.闅斿紑鐨勫垪琛紝鎶婅繖涓綔涓哄弬鏁帮紝鍜屼笅闈onsole涓€鏍?log(1,2,3,4,5)//12345娣辨嫹璐濅竴涓暟缁勬垜浠彲浠ヤ娇鐢ㄥ睍寮€杩愮畻绗﹀鏁扮粍杩涜娣辨嫹璐濓紝绀轰緥浠ｇ爜濡備笅锛?/瀹氫箟涓€涓猘rrayvararr=[1,2,3,4,5]//娴呮嫹璐漹ararr1=arr//娣辨嫹璐漹ararr2=[...arr]//姣旇緝鏃讹紝娴呮嫹璐濆拰鍘熸潵涓€鏍穉rrayconsole.log(arr1===arr);//娣辨嫹璐濅笌鍘熸暟缁勪笉鍚宑onsole.log(arr2===arr);/***杩欐槸鍥犱负娴呮嫹璐濇嫹璐濈殑鏄唴瀛樺湴鍧€锛岃€屾繁鎷疯礉澶嶅埗鐨勬槸鍏蜂綋鐨勫€?///褰撴垜浠慨鏀瑰師鏁扮粍鍚庯紝sha鐨勫€间綆鎷疯礉涔熶細涓€璧锋敼鍙橈紝浣嗘槸娣辨嫹璐濅笉浼歛rr[0]=10//淇敼鍘熸暟缁勭殑绗竴涓€间负10console.log(arr1)//[10,2,3,4,5]console.log(arr2)//[1,2,3,4,5]娣辨嫹璐濆拰娴呮嫹璐濈殑缁嗚妭鍚庨潰浼氳缁嗚В閲娿€傚璞℃墿灞曡繍绠楃鍦‥CMAScript2018涓皢鎵╁睍瀛楃寮曞叆鍒板璞′腑锛屽叾浣滅敤涓嶄粎浠呮槸鎵╁睍涓€涓璞★紝杩樺彲浠ュ湪缁撴瀯浣撹祴鍊兼椂璇诲彇鍓╀綑鐨勫睘鎬с€傜ず渚嬩唬鐮佸涓嬶細//瀹氫箟涓€涓璞arperson={name:'TheOtherBank',hobby:'coding',age:18}//娣辨嫹璐濅竴涓璞arperson2={...person}//鍒嗛厤缁撴瀯鏃讹紝鎺ュ彈鍓╀綑鍊紇ar{name,...obj}=personconsole.log(name,obj)//涓栧哺璐垫棌{hobby:'coding',age:18}鍊煎緱娉ㄦ剰鐨勬槸spreadoperator鍙兘澶嶅埗鍏惰嚜韬笉鑳戒粠鍘熷瀷瀵硅薄缁ф壙鐨勫睘鎬т腑澶嶅埗鐨勫睘鎬с€傜┖鍚堝苟杩愮畻绗??绌哄悎骞惰繍绠楃鐢变袱涓棶鍙疯〃绀恒€傝杩愮畻绗︿篃鏄竴涓€昏緫杩愮畻绗︼紝绫讳技浜庨€昏緫鎴栬繍绠楃銆傝绠楄鍒欐槸鍙宸︽搷浣滄暟涓簄ull鎴杣ndefined锛屽氨杩斿洖鍙虫搷浣滄暟锛屽惁鍒欒繑鍥炲乏鎿嶄綔鏁般€傚彧鏈夊綋宸︽搷浣滄暟杞崲涓哄竷灏旂被鍨嬩笖涓哄亣鏃讹紝閫昏緫鎴栬繍绠楃鎵嶈繑鍥炲彸鎿嶄綔鏁般€傜ず渚嬩唬鐮佸涓嬶細console.log(null??10)//10console.log(undefined??10)//10console.log(false??10)//false杩欎釜鎿嶄綔绗︾敤鏉ヨ祴鍊煎埌娌℃湁浠峰€肩殑鍙橀噺銆傛湁鐢紝渚嬪锛氬鏋滄暟瀛楁病鏈夊€硷紝鍒欒祴鍊硷紝鍚﹀垯涓嶈祴鍊硷紝绀轰緥浠ｇ爜濡備笅锛歷arvalue//濡傛灉value鐨勫€间笉涓簄ull鎴杣ndefined锛屽垯璧嬪€?0鍊?鍊??10console.log(value)//10鍊煎緱娉ㄦ剰鐨勬槸绌哄€煎悎骞惰繍绠楃鍜岄€昏緫涓庡拰閫昏緫鎴栦笉鑳藉悓鏃朵娇鐢紝鍚﹀垯浼氭姏鍑哄紓甯搞€傝В鍐冲姙娉曟槸鐢?)鏉ヨ〃绀轰紭鍏堢骇銆傛祻瑙堝櫒鍏煎鎬у涓嬶細涓婂浘鏉ユ簮锛欳anIusethenullcoalescingassignmentoperator??=Ourabovevalue=value??10鍙互绠€鍐欎负value??=10銆俷ull鍚堝苟璧嬪€艰繍绠楃涔熸槸涓€绉嶅鍚堣祴鍊艰繍绠楃锛屽叾鐩殑鏄负浜嗙畝鍖栦笂闈㈢殑鍐欐硶銆傛祻瑙堝櫒鍏煎鎬у涓嬶細涓婂浘鏉ユ簮锛欳anIuselogicalandassignmentoperator&&=andlogicalorassignmentoperator||=logicalandassignmentoperatorandlogicalorassignmentoperator||=isalsoacompoundassignmentoperator涓€銆佸畠鍑虹幇鐨勭洰鐨勬槸涓轰簡绠€鍖栦唬鐮併€傜ず渚嬩唬鐮佸涓嬶細varx=0;vary=1;x&&=0;//0x&&=1;//0y&&=1;//1y&&=0;//0//涓婅堪浠ｇ爜绛墄=x&&0x=x&&1y=y&&1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