鏈枃缈昏瘧鑷猂eact浣滆€匘anAbramov鍙戣〃鐨勪竴鏈熼珮璋冩枃绔犮€傛枃鏈湁鍘熸枃閾炬帴銆傛枃绔犻€氫織鏄撴噦锛屽彲璇绘€т篃涓嶉敊锛屽垎浜粰澶у銆傛杩庡React18鎰熷叴瓒ｇ殑鏈嬪弸涓€璧峰涔犺璁恒€傛杩癛eact18閫氳繃榛樿鎵ц鏇村鎵瑰鐞嗘潵澧炲姞寮€绠卞嵆鐢ㄧ殑鎬ц兘鏀硅繘锛屼粠鑰屾秷闄や簡鍦ㄥ簲鐢ㄧ▼搴忔垨搴撲唬鐮佷腑鎵嬪姩鎵瑰鐞嗘洿鏂扮殑闇€瑕併€傝繖绡囨枃绔犲皢瑙ｉ噴浠€涔堟槸鎵瑰鐞嗭紝瀹冭繃鍘绘槸濡備綍宸ヤ綔鐨勶紝浠ュ強鍙戠敓浜嗕粈涔堝彉鍖栥€傛敞鎰忥細杩欐槸涓€涓繁鍏ョ殑鍔熻兘锛屾垜浠笉甯屾湜澶у鏁扮敤鎴烽渶瑕佽€冭檻銆備絾瀹冨彲鑳戒笌甯冮亾鑰呭拰React搴撳紑鍙戜汉鍛樺瘑鍒囩浉鍏炽€備粈涔堟槸鎵瑰鐞嗘壒澶勭悊鏄疪eact灏嗗涓姸鎬佹洿鏂板垎缁勫埌涓€涓崟鐙殑閲嶆柊娓叉煋涓互鑾峰緱鏇村ソ鎬ц兘鐨勬搷浣溿€備緥濡傦紝濡傛灉鎮ㄥ湪鍚屼竴涓偣鍑讳簨浠朵腑鏈変袱涓姸鎬佹洿鏂帮紝React灏嗗缁堝皢瀹冧滑鎵瑰鐞嗕负涓€涓噸鏂版覆鏌撱€傚鏋滀綘杩愯涓嬮潰鐨勪唬鐮侊紝浣犱細鐪嬪埌React姣忔鐐瑰嚮鍙墽琛屼竴娆℃覆鏌擄紝鍗充娇浣犺缃簡涓ゆ鐘舵€侊細functionApp(){const[count,setCount]=useState(0);const[flag,setFlag]=useState(false);鍑芥暟handleClick(){setCount(c=>c+1);//杩樻病鏈夐噸鏂版覆鏌搒etFlag(f=>!f);//杩樹笉閲嶆柊娓叉煋//React鍙細鍦ㄦ渶鍚庨噸鏂版覆鏌撲竴娆★紙杩欐槸鎵瑰鐞嗭紒锛墋return(
Next{count}
);}鉁呮紨绀猴細鍦ㄤ簨浠跺鐞嗙▼搴忎腑鍙嶅簲17涓壒娆°€傦紙璇锋敞鎰忥紝鎺у埗鍙颁腑鐨勬瘡娆＄偣鍑婚兘浼氬憟鐜颁竴娆°€?杩欏鎬ц兘寰堟湁甯姪锛屽洜涓哄畠閬垮厤浜嗕笉蹇呰鐨勯噸鏂版覆鏌撱€傚畠杩樺彲浠ラ槻姝㈡偍鐨勭粍浠跺憟鐜扳€滃崐瀹屾垚鈥濈姸鎬侊紝鍏朵腑鍙湁涓€涓姸鎬佸彉閲忚鏇存柊锛岃繖鍙兘浼氬鑷撮敊璇€傝繖鍙兘浼氳鎮ㄦ兂璧烽鍘呮湇鍔″憳锛屼粬浠湪鎮ㄩ€夋嫨绗竴閬撹彍鏃朵笉浼氳窇鍒板帹鎴匡紝鑰屾槸绛夊緟鎮ㄥ畬鎴愯鍗曘€傜劧鑰岋紝React鐨勬壒閲忔洿鏂版椂闂村苟涓嶄竴鑷淬€備緥濡傦紝濡傛灉鎮ㄩ渶瑕佽幏鍙栨暟鎹劧鍚庢洿鏂癶andleClick涓婄殑鐘舵€侊紝鑰屼笉鏄壒澶勭悊鏇存柊锛孯eact灏嗘墽琛屼袱涓崟鐙殑鏇存柊銆傝繖鏄洜涓篟eact杩囧幓鍙湪娴忚鍣ㄤ簨浠讹紙渚嬪鐐瑰嚮锛夋湡闂存壒閲忔洿鏂帮紝浣嗚繖閲屾垜浠湪浜嬩欢澶勭悊鍚庢洿鏂扮姸鎬侊紙鍦╢etch鍥炶皟涓級锛歠unctionApp(){const[count,setCount]=useState(0);const[flag,setFlag]=useState(false);functionhandleClick(){fetchSomething().then(()=>{//React17鍜屾洿鏃╃増鏈笉浼氭壒澶勭悊杩欎簺鍥犱负//瀹冧滑鍦ㄥ洖璋冧腑*鍦?浜嬩欢涔嬪悗杩愯锛岃€屼笉鏄?鍦?鏈熼棿杩愯setCount(c=>c+1);//瀵艰嚧閲嶆柊娓叉煋setFlag(f=>!f);//瀵艰嚧閲嶆柊娓叉煋});}return(
Next{count}
);}鍦≧eact18涔嬪墠锛屾垜浠彧鍦≧eact浜嬩欢澶勭悊绋嬪簭鏈熼棿鎵归噺鏇存柊銆傞粯璁ゆ儏鍐典笅锛孯eact涓嶄細鎵瑰鐞唒romises銆乻etTimeouts銆佹湰鏈轰簨浠跺鐞嗙▼搴忔垨React榛樿涓嶄細鎵瑰鐞嗙殑鍏朵粬浜嬩欢銆備粈涔堟槸鑷姩鎵瑰鐞嗭紵浠嶳eact18鐨刢reateRoot寮€濮嬶紝鎵€鏈夋洿鏂伴兘灏嗚嚜鍔ㄦ壒澶勭悊锛屾棤璁哄畠浠潵鑷摢閲屻€傝繖鎰忓懗鐫€瓒呮椂銆佹壙璇恒€佹湰鏈轰簨浠跺鐞嗙▼搴忔垨浠讳綍鍏朵粬浜嬩欢鍐呯殑鏇存柊灏嗕互涓嶳eact浜嬩欢鍐呯殑鏇存柊鐩稿悓鐨勬柟寮忚繘琛屾壒澶勭悊銆傛垜浠笇鏈涜繖浼氬噺灏戞覆鏌撳伐浣滐紝浠庤€屾彁楂樺簲鐢ㄧ▼搴忕殑鎬ц兘锛歠unctionApp(){const[count,setCount]=useState(0);const[flag,setFlag]=useState(false);functionhandleClick(){fetchSomething().then(()=>{//React18鍙婃洿楂樼増鏈‘瀹炴壒澶勭悊杩欎簺锛歴etCount(c=>c+1);setFlag(f=>!f);//React鍙細鏈€鍚庨噸鏂版覆鏌撲竴娆★紙杩欐槸鎵瑰鐞嗭紒锛墋);}return(
Next{count}
);}鉁呮紨绀猴細鍦ㄤ簨浠跺鐞嗕箣澶栬繘琛孯eact18createRoot鎵瑰鐞嗭紒锛堟敞鎰忔帶鍒跺彴涓殑姣忔鐐瑰嚮娓叉煋锛侊級馃煛婕旂ず锛歊eact18withlegagerender淇濈暀鏃ц涓猴紙娉ㄦ剰鎺у埗鍙颁腑鐨勬瘡娆＄偣鍑绘覆鏌撱€傦級娉ㄦ剰锛氫綔涓洪噰鐢≧eact18鐨勪竴閮ㄥ垎锛屾偍搴旇鍗囩骇鍒癱reateRoot銆傛棫琛屼负鐨勫憟鐜板彧鏄负浜嗘洿瀹规槗鍦ㄧ敓浜т腑璇曢獙杩欎袱涓増鏈€傛棤璁哄彂鐢熷湪浣曞锛孯eact閮戒細鑷姩鎵归噺鏇存柊锛屽洜姝わ細functionhandleClick(){setCount(c=>c+1);璁剧疆鏍囧織锛坒=>锛乫锛夛紱//React鍙細鍦ㄦ渶鍚庨噸鏂版覆鏌撲竴娆★紙杩欐槸鎵瑰鐞嗭紒锛墋涓庢鐩稿悓锛?setTimeout)setTimeout(()=>{setCount(c=>c+1);setFlag(f=>!f);//React鍙細鍦ㄦ渶鍚庨噸鏂版覆鏌撲竴娆★紙杩欏氨鏄壒澶勭悊锛侊級},1000);涓庢鐩稿悓锛?fetch)fetch(/*...*/).then(()=>{setCount(c=>c+1);setFlag(f=>!f);//React鍙細閲嶆柊-鏈€鍚庢覆鏌撲竴娆★紙鍗虫壒澶勭悊锛侊級})琛屼负涓庢鐩稿悓锛?addEventListener)elm.addEventListener('click',()=>{setCount(c=>c+1);setFlag(f=>!f);//React鍙細鍦ㄦ渶鍚庨噸鏂版覆鏌撲竴娆★紙杩欏氨鏄壒澶勭悊锛侊級});娉ㄦ剰锛歊eact鍙細鍦ㄥ畨鍏ㄧǔ瀹氱殑鍦烘櫙涓嬫壒閲忔洿鏂般€備緥濡傦紝React纭繚瀵逛簬姣忎釜鐢ㄦ埛鍚姩鐨勪簨浠讹紙渚嬪鍗曞嚮鎴栨寜閿級锛孌OM鍦ㄤ笅涓€涓簨浠朵箣鍓嶅畬鍏ㄦ洿鏂般€備緥濡傦紝杩欏彲纭繚鍦ㄦ彁浜ゆ椂绂佺敤鐨勮〃鍗曚笉鈥嬧€嬩細琚彁浜や袱娆°€備笉鎯虫壒閲忔€庝箞鍔烇紵閫氬父锛屾壒澶勭悊鏄畨鍏ㄧ殑锛屼絾鏌愪簺浠ｇ爜鍙兘渚濊禆浜庡湪鐘舵€佹洿鏀瑰悗绔嬪嵆浠嶥OM涓鍙栨煇浜涘唴瀹广€傚浜庤繖浜涚敤渚嬶紝鎮ㄥ彲浠ラ€夋嫨涓嶄娇鐢≧eactDOM.flushSync()杩涜鎵瑰鐞嗭細//娉ㄦ剰锛歳eact-dom锛屼笉鏄痳eactfunctionhandleClick(){flushSync(()=>{setCounter(c=>c+1);});//React鐜板湪宸茬粡鏇存柊浜咲OMflushSync(()=>{setFlag(f=>!f);});//React鐜板湪宸茬粡鏇存柊浜咲OM}鎴戜滑涓嶅笇鏈涜繖绉嶆儏鍐电粡甯稿彂鐢熴€傚Hooks鏈夊奖鍝嶅悧锛熷鏋滄偍浣跨敤Hooks锛屾垜浠笇鏈涜嚜鍔ㄦ壒澶勭悊鍦ㄧ粷澶у鏁版儏鍐典笅閮借兘鈥滄甯稿伐浣溾€濄€傦紙濡傛灉娌℃湁锛岃鍛婅瘔鎴戜滑锛侊級瀹冨璇剧▼鏈夊奖鍝嶅悧锛熻璁颁綇锛孯eact浜嬩欢澶勭悊绋嬪簭鏈熼棿鐨勬洿鏂板缁堟槸鎵瑰鐞嗙殑锛屽洜姝ゅ浜庤繖浜涙洿鏂帮紝娌℃湁浠讳綍鏀瑰彉銆傜被缁勪欢涓瓨鍦ㄨ竟缂樻儏鍐碉紝杩欏彲鑳芥槸涓棶棰樸€傜被缁勪欢鏈変竴涓疄鐜版€櫀锛屽彲浠ュ悓姝ヨ鍙栦簨浠跺唴閮ㄧ殑鐘舵€佹洿鏂般€傝繖鎰忓懗鐫€鎮ㄥ皢鑳藉鍦ㄨ皟鐢╯etState涔嬮棿璇诲彇this.state锛歨andleClick=()=>{setTimeout(()=>{this.setState(({count})=>({count:count+1}));//{count:1,flag:false}console.log(this.state);this.setState(({flag})=>({flag:!flag}));});};鍦≧eact18涓紝鎯呭喌涓嶅啀濡傛銆傜敱浜庡setTimeout鐨勬墍鏈夋洿鏂伴兘鏄壒澶勭悊鐨勶紝鍥犳React涓嶄細鍦ㄧ涓€娆″悓姝ヨ皟鐢╯etState鏃舵覆鏌撶粨鏋溾€斺€旀覆鏌撳彂鐢熷湪涓嬩竴娆℃祻瑙堝櫒鍒嗘淳鏃躲€傛墍浠ユ覆鏌撹繕娌℃湁鍙戠敓锛歨andleClick=()=>{setTimeout(()=>{this.setState(({count})=>({count:count+1}));//{count:0,鏍囧織:false}console.log(this.state);this.setState(({flag})=>({flag:!flag}));});};瑙佷唬鐮併€傚鏋滆繖鏄崌绾у埌React18鐨勯殰纰嶏紝鎮ㄥ彲浠ヤ娇鐢≧eactDOM.flushSync寮哄埗鏇存柊锛屼絾鎴戜滑寤鸿璋ㄦ厧浣跨敤瀹冿細handleClick=()=>{setTimeout(()=>{ReactDOM.flushSync(()=>{this.setState(({count})=>({count:count+1}));});//{count:1,flag:false}console.log(this.state);this.setState(({flag})=>({flag:!flag}));});};瑙佷唬鐮併€傝繖涓棶棰樹笉浼氬奖鍝嶅甫鏈塇ooks鐨勫姛鑳界粍浠讹紝鍥犱负璁剧疆鐘舵€佷笉浼氭洿鏂皍seState涓殑鐜版湁鍙橀噺锛歠unctionhandleClick(){setTimeout(()=>{console.log(count);//0setCount(c=>c+1);setCount(c=>c+1);setCount(c=>c+1);console.log(count);//0},1000)铏界劧褰撲綘浣跨敤Hooks鏃惰繖绉嶈涓哄彲鑳戒护浜烘儕璁讹紝浣嗗畠涓鸿嚜鍔ㄦ壒澶勭悊閾哄钩浜嗛亾璺€倁nstable_batchedUpdates鎬庝箞鏍凤紵涓€浜汻eact搴撲娇鐢ㄨ繖涓湭璁板綍鐨凙PI鏉ュ己鍒跺setState澶栭儴浜嬩欢澶勭悊绋嬪簭杩涜鎵瑰鐞嗭細import{unstable_batchedUpdates}from'react-dom';unstable_batchedUpdates(()=>{setCount(c=>c+1);setFlag(f=>!f);});杩欎釜API鍦?8涓粛鐒跺瓨鍦紝浣嗕笉鍐嶉渶瑕佸畠锛屽洜涓烘壒澶勭悊鏄嚜鍔ㄥ彂鐢熺殑銆傛垜浠笉浼氬湪18涓垹闄ゅ畠锛屼絾鍦ㄦ祦琛岀殑搴撲笉鍐嶄緷璧栦簬瀹冪殑瀛樺湪鍚庯紝瀹冨彲鑳戒細鍦ㄦ湭鏉ョ殑涓昏鐗堟湰涓鍒犻櫎銆傚師鏂囧湴鍧€锛歨ttps://github.com/reactwg/re...
