涓嶆槗鍐欙紝鏈粡浣滆€呰鍙紝绂佹浠ヤ换浣曞舰寮忚浆杞斤紒濡傛灉瑙夊緱鏂囩珷涓嶉敊锛屾杩庡叧娉ㄣ€佺偣璧炪€佸垎浜紒鎸佺画鍒嗕韩鎶€鏈崥鏂囷紝鍏虫敞寰俊鍏紬鍙佛煈夝煆诲墠绔帢閲戝師鍒涙枃绔犱负浠€涔堥渶瑕佸瀮鍦惧洖鏀跺湪C/C++涓紝璺熻釜鍐呭瓨浣跨敤鍜岀鐞嗗唴瀛樻槸寮€鍙戣€呯殑涓€澶ц礋鎷匤avaScript浣跨敤鍨冨溇鍥炴敹鏈哄埗鎹㈠彞璇濊锛屾墽琛岀幆澧冭礋璐ｅ湪浠ｇ爜鎵ц鏈熼棿绠＄悊鍐呭瓨锛屼粠鑰屽噺杞讳簡寮€鍙戜汉鍛樼殑璐熸媴銆傞€氳繃鑷姩鍐呭瓨绠＄悊杩涜鍐呭瓨鍒嗛厤鍜岃祫婧愬洖鏀剁殑鍩烘湰鎬濊矾闈炲父绠€鍗曘€傜‘瀹氫笉鍐嶄娇鐢ㄥ摢涓彉閲忥紝鍏堕噴鏀惧唴瀛樼┖闂寸殑杩囩▼鏄懆鏈熸€х殑锛屼篃灏辨槸璇村瀮鍦惧洖鏀剁▼搴忔瘡闅斾竴娈垫椂闂村氨浼氳繍琛屼竴娆★紝灏卞儚JS涓殑瀵硅薄銆佸瓧绗︿覆銆佸璞＄殑鍐呭瓨鏄笉鍥哄畾鐨勶紝鍙湁鐪熸浣跨敤鍒扮殑鎵嶈鍔ㄦ€佸垎閰嶅唴瀛樻椂锛屽唴瀛樹笉鐢ㄥ悗闇€瑕侀噴鏀撅紝浠ヤ究鍐嶆浣跨敤锛屽惁鍒欎細瀵艰嚧璁＄畻鏈哄彲鐢ㄥ唴瀛樿€楀敖鍚庢鏈恒€備粎鍙傝€冨€笺€傚綋鍙橀噺寮曠敤鍊兼椂锛屽紩鐢ㄨ鏁?1銆傚綋鍙橀噺鐨勫紩鐢ㄨ瑕嗙洊鎴栨竻闄ゆ椂锛屽紩鐢ㄨ鏁?1銆傚綋寮曠敤璁℃暟涓?鏃讹紝鍙互瀹夊叏閲婃斁鍐呭瓨銆俵etarr=[1,0,1]//[1,0,1]杩欐鍐呭瓨琚玜rr寮曠敤涓?arr=[0,1,0]//[1,0鐨勫唴瀛樺紩鐢ㄦ鏁?1]涓?閲婃斁//[0,1,0]鍐呭瓨琚玜rr寮曠敤寮曠敤娆℃暟涓?consttmp=arr//[0,1,0]鍐呭瓨琚玹mp寮曠敤娆℃暟鏄?寰幆寮曠敤闂NetscapeNavigator3.0閫氳繃鍦ㄨ繖涓緥瀛愪腑锛孫bjectA鍜孫bjectB鐨勫睘鎬у垎鍒浉浜掑紩鐢ㄣ€傝繖涓嚱鏁版墽琛屽悗锛孫bject琚紩鐢ㄧ殑娆℃暟涓嶄細鍙樻垚0锛屽奖鍝嶆甯哥殑GC銆傚鏋滃娆℃墽琛岋紝浼氶€犳垚涓ラ噸鐨勫唴瀛樻硠婕忋€俶ark-and-sweep鏂规硶涓嶅瓨鍦ㄨ繖涓棶棰樸€俧unctionExample(){letObjectA=newObject();璁㎡bjectB=newObject();ObjectA.p=ObjectB;ObjectB.p=ObjectA;}渚嬪瓙锛堬級;瑙ｅ喅鏂规硶锛氬湪鍑芥暟鏈熬鎸囧悜nullObjectA=null;ObjectB=null;Mark-and-sweep鏂规硶涓轰簡瑙ｅ喅寰幆寮曠敤寮曡捣鐨勫唴瀛樻硠婕忛棶棰橈紝NetscapeNavigator4.0寮€濮嬮噰鐢╩ark-and-sweep鏂规硶銆傚埌2008骞达紝IE銆丗irefox銆丱pera銆丆hrome鍜孲afari閮藉湪鍏禞avaScript瀹炵幇锛堟垨鍏跺彉浣擄級涓噰鐢ㄤ簡鏍囪娓呴櫎锛屽彧鏄瀮鍦炬敹闆嗚繍琛岀殑棰戠巼涓嶅悓銆傝繖涓兂娉曟槸鍦ㄥ彉閲忚繘鍏ユ墽琛屼笂涓嬫枃鏃跺皢鍏舵爣璁颁负鈥滃叆鍙ｂ€濓紝骞跺湪鍙橀噺绂诲紑鎵ц涓婁笅鏂囨椂灏嗗叾鏍囪涓衡€滅寮€鈥濄€備粠姝よ繖涓彉閲忓氨涓嶈兘璁块棶浜嗭紝鍐呭瓨浼氬湪涓嬫鍨冨溇鍥炴敹鏃堕噴鏀俱€傚嚱鏁扮ず渚?n){consta=1,b=2,c=3;returnn*a*b*c;}//灏嗗疄渚嬫爣璁颁负鎵ц涓婁笅鏂嘽onstn=1;//灏唍鏍囪鍒版墽琛屼笂涓嬫枃涓璄xample(n);//鏍囪a,b,c杩涘叆鎵ц涓婁笅鏂嘽onsole.log(n);//鏍囪a,b,c绂诲紑鎵ц涓婁笅鏂囷紝绛夊緟鍨冨溇鍥炴敹鍧楃骇浣滅敤鍩熴€傚綋鍧楃骇浣滅敤鍩熸棭浜庡嚱鏁颁綔鐢ㄥ煙缁撴潫鏃讹紝鍨冨溇鍥炴敹绋嬪簭浼氭洿鏃╀粙鍏ワ紝灏藉揩鍥炴敹鍥炴敹鐨勫唴瀛橈紝浠庤€屾彁楂樺瀮鍦惧洖鏀剁殑鎬ц兘銆俈8寮曟搸鍨冨溇鏀堕泦V8寮曟搸鐨勫瀮鍦炬敹闆嗛噰鐢ㄦ爣璁版竻闄ゆ硶鍜屽垎浠ｆ敹闆嗘硶锛屽垎涓烘柊鐢熶唬鍜岃€佸勾浠ｃ€傛柊涓€浠ｅ瀮鍦惧洖鏀堕噰鐢⊿cavenge绠楁硶鍒嗛厤commonmemory鍜屾柊鍒嗛厤鐨剆mallmemory銆?4浣嶇郴缁?2M鍐呭瓨鍒嗗尯鏂颁竴浠ｅ唴瀛樺垎涓轰互涓嬩袱涓尯鍩燂紝鍚勫崰鍐呭瓨鐨勪竴鍗娿€侳romspaceTospace姝ｅ湪杩愯銆傚疄闄呬笂鍙湁FromspaceTo绌洪棿鍦ㄨ繍琛屻€傚綋From绌洪棿鐨勫唴瀛樹娇鐢ㄧ巼鍗冲皢杈惧埌涓婇檺鏃讹紝Scavenge绠楁硶寮€濮嬪瀮鍦惧洖鏀躲€傛爣璁扮┖闂翠腑涓嶅彲杈剧殑瀵硅薄锛屽皢鏈爣璁扮殑瀵硅薄浠嶧rom绌洪棿澶嶅埗鍒癟o绌洪棿銆傝В鍐充簡鍐呭瓨鏁ｅ潡锛堜笉杩炵画鍐呭瓨绌洪棿锛夌殑闂锛岀浉褰撲簬鐢ㄧ┖闂存崲鍙栨椂闂淬€傜劧鍚庡皢From绌洪棿娓呯┖锛岄棽缃紝鍗冲彉鎹㈠埌To绌洪棿锛屼織绉板弽婕斻€俆henewgeneration->oldgeneration鏂扮敓浠ｅ瓨鍌ㄥ皯閲忔柊鍒嗛厤鐨勫唴瀛樸€傚鏋滄弧瓒充互涓嬫潯浠朵箣涓€锛屽垯鍒嗛厤缁欒€佸勾浠ｃ€傚唴瀛樺ぇ灏忚揪鍒癋rom绌洪棿鐨?5%銆傚畠缁忓巻浜咶romspace<->Tospace鑰佸勾浠ｇ殑杞洖鑰佸勾浠ｉ噰鐢╩ark-sweep鏍囪娓呴櫎鍜宮ark-compact鏍囪鏁寸悊閫氬父瀛樺偍杈冨ぇ鐨勫唴瀛樺潡鍜屼粠鏂扮敓浠ｅ垎閰嶇殑鍐呭瓨鍧楀唴瀛樺ぇ灏?2浣嶇郴缁熷ぇ绾?00M64浣嶇郴缁熷ぇ绾?.4GPartitionOldObjectSpace鐨勫瓧闈㈤噺鑰佸勾浠ｅ瓨鏀剧殑鏄柊鐢熶唬鍒嗛厤鐨勫唴瀛樸€侺argeObjectSpace瀛樻斁杈冨ぇ鍐呭瓨鍏朵粬鍖烘斁涓嶄笅锛屽熀鏈?M浠ヤ笂MapSpace瀛樻斁瀛樻斁瀵硅薄鐨勬槧灏勫叧绯荤畝绉扮被鍨?鎵弿锛屾槸涓嶅彲鍥炴敹鐨勶紝浠ヤ笅绠€绉扮被鍨?鎵弿瀹屾垚锛屾槸涓嶅彲鍥炴敹鐨勶紝浠ヤ笅绠€绉扮被鍨?閬嶅巻锛屼娇鐢ㄦ繁搴︿紭鍏堥亶鍘嗛亶鍘嗘瘡涓璞°€傞鍏堝皢鎵€鏈夐潪鏍瑰璞℃爣璁颁负1绫伙紝鐒跺悗杩涜娣卞害浼樺厛閬嶅巻銆傞亶鍘嗚繃绋嬩腑灏嗗璞″帇鍏ユ爤涓紝鍦ㄦ杩囩▼涓皢瀵硅薄鏍囪涓?绉嶇被鍨嬨€傞亶鍘嗗畬鎴愬悗锛屽皢瀵硅薄鍑烘爤锛屽苟灏嗚瀵硅薄鏍囪涓?绉嶇被鍨嬨€傛暣涓繃绋嬬洿鍒版爤绌篗ark-sweep鏍囪瀹屾垚锛屾爣璁颁负1绫荤殑瀵硅薄琚噴鏀惧唴瀛樸€侻ark-compact鍨冨溇鍥炴敹瀹屾垚鍚庯紝鍐呭瓨绌洪棿涓嶈繛缁€傝繖鏍峰緢瀹规槗閫犳垚鏃犳硶鍒嗛厤澶у唴瀛樼┖闂寸殑闂锛屼粠鑰岃Е鍙戝瀮鍦惧洖鏀躲€傚洜姝わ紝浼氭湁涓€涓狹ark-compact姝ラ锛屽皢鏈洖鏀剁殑鍐呭瓨鍧楃粍缁囨垚杩炵画鐨勫唴瀛樼┖闂淬€傞绻佽Е鍙戝瀮鍦惧洖鏀朵細褰卞搷寮曟搸鐨勬€ц兘銆傚綋鍐呭瓨绌洪棿涓嶈冻鏃讹紝浼氶鍏堣Е鍙慚ark-compact鍨冨溇鍥炴敹銆傚閲忔爣璁颁紭鍖栥€傚鏋滃湪闆嗕腑鐨勬椂闂存杩涜鍨冨溇鍥炴敹锛屾柊鐢熶唬灏辨病闂銆傚璞★紝杩欏彲鑳戒細瀵艰嚧寤惰繜銆傚閲忔爣璁帮細浣垮瀮鍦惧洖鏀剁▼搴忓拰搴旂敤閫昏緫绋嬪簭浜ゆ浛杩愯銆傛€濊矾绫讳技浜嶵imeSlicing骞惰鏀堕泦銆傚湪鍨冨溇鍥炴敹鐨勮繃绋嬩腑锛屼細寮€鍚嚑涓緟鍔╃嚎绋嬫潵鎻愰珮鍨冨溇鍥炴敹鐨勬晥鐜囥€傚湪閫昏緫绋嬪簭鎵ц杩囩▼涓紝骞跺彂鏀堕泦鍚姩澶氫釜杈呭姪绾跨▼杩涜鍨冨溇鏀堕泦锛屾竻鐞嗕笌涓荤嚎绋嬫病鏈夐€昏緫鍏崇郴鐨勫唴瀛樸€傚唴瀛樻硠婕忓満鏅殑鍏ㄥ眬鍙橀噺//exm1functionExample(){exm='LeBron'}//exm2functionExample(){this.exm='LeBron'}Example()娓呴櫎璁℃椂鍣╟onsttimer=setInterval(()=>{//...},1000)//clearInterval(timer)闂寘鍑芥暟debounce(fn,time){lettimeout=null;杩斿洖鍑芥暟(){if(瓒呮椂){clearTimeout(瓒呮椂);}timeout=setTimeout(()=>{fn.apply(this,arguments);},鏃堕棿);};}constfn=debounce(handler,1000);//fn鎸囩殑鏄秴鏃舵湭娓呴櫎鐨凞OM鍏冪礌寮曠敤constelement={//杩欓噷寮曠敤DOM鍏冪礌鎸夐挳锛歞ocument.getElementById('LeBron'),select:document.getElementById('select')}document.body.removeChild(document.getElementById('LeBron'))濡備綍妫€娴嬪唴瀛樻硠婕忚繖涓叾瀹炰笉闅撅紝鍙互鍦ㄦ祻瑙堝櫒鍘熷紑鍙戣€呭伐鍏稰erformance涓墦寮€寮€鍙戣€呭伐鍏凤紝姝ラF12锛岄€夋嫨Performance宸ュ叿鏍忥紝鍕鹃€夋埅鍥惧拰鍐呭瓨锛岀偣鍑诲紑濮嬪綍鍒朵竴娈垫椂闂达紝鐒跺悗缁撴潫褰曞埗銆傜敓鎴愮殑鍫嗗唴瀛樺皢瀹氭湡鍒嗛厤鍜岄噴鏀俱€傚鏋滃爢鍐呭瓨鐨刴in鍊煎湪閫愭笎澧炲ぇ锛屽氨浼氬嚭鐜板唴瀛樻硠婕忋€備紭鍖栧唴瀛樹娇鐢紝灏介噺涓嶈鍦╢or寰幆涓畾涔夊嚱鏁?/exmconstfn=(idx)=>{returnidx*2;}functionExample(){for(leti=0;i<1000;i++){//constfn=(idx)=>{//r杩斿洖idx*2;//}constres=fn(i);}}灏介噺涓嶈鍦╢or寰幆鍑芥暟涓畾涔夊璞xample(){constobj={};璁﹔es="";for(leti=0;i<1000;i++){//constobj={//a:i,//b:i*2,//c:i*3,//};obj.a=i;obj.b=i*2;obj.c=i*3;res+=JSON.stringify(obj);}returnres}绌烘暟缁刟rr=[0,1,2]arr.length=0;//娓呯┖鏁扮粍锛屾暟缁勭被鍨嬩笉鏀瑰彉//arr=[]//閲嶆柊鐢宠涓€涓┖鏁扮粍瀵硅薄鍐呭瓨鎺橀噾鍘熷垱鎺橀噾锛氬墠绔嫆甯冩湕鐭ヤ箮锛氬墠绔嫆甯冩湕缁х画鍒嗕韩鎶€鏈崥鏂囷紝鍏虫敞寰俊鍏紬鍙佛煈夝煆诲墠绔疞eBron
