{"id":38068,"date":"2023-01-22T15:17:12","date_gmt":"2024-02-13T20:41:43","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8usereducer\/"},"modified":"2024-04-29T10:53:24","modified_gmt":"2024-04-29T02:53:24","slug":"%e3%80%90react%e3%80%91%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8usereducer","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8usereducer\/","title":{"rendered":"\u3010React\u3011\u5c1d\u8bd5\u4f7f\u7528useReducer"},"content":{"rendered":"

\u4f7f\u7528 useReducer \u8fdb\u884c\u72b6\u6001\u7ba1\u7406<\/h2>\n

React Hooks \u63d0\u4f9b\u4e86\u4e00\u79cd\u5f88\u68d2\u7684\u5de5\u5177\uff0c\u7528\u4e8e\u5904\u7406\u51fd\u6570\u7ec4\u4ef6\u4e2d\u7684\u72b6\u6001\u548c\u751f\u547d\u5468\u671f\u3002\u5176\u4e2d\uff0cuseReducer \u5728\u590d\u6742\u7684\u72b6\u6001\u7ba1\u7406\u65b9\u9762\u5c24\u5176\u5f3a\u5927\u3002\u672c\u6587\u5c06\u89e3\u91ca useReducer \u7684\u57fa\u672c\u7528\u6cd5\u3002<\/p>\n

1. \u57fa\u7840\u7684 useReducer<\/h3>\n

useReducer\u662f\u7528\u4e8e\u7ba1\u7406\u72b6\u6001\u7684\u51fd\u6570\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5b83\u7528\u4e8e\u5728\u7ec4\u4ef6\u5185\u7ba1\u7406\u590d\u6742\u7684\u72b6\u6001\u6216\u8005\u66f4\u65b0\u903b\u8f91\u590d\u6742\u7684\u60c5\u51b5\u3002\u8ba9\u6211\u4eec\u6765\u770b\u770b\u57fa\u672c\u7684\u7528\u6cd5\u3002<\/p>\n

import<\/span> {<\/span> Reducer<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\ninterface<\/span> State<\/span> {<\/span>\r\n  count<\/span>:<\/span> number<\/span>;<\/span>\r\n}<\/span>\r\n\r\ninterface<\/span> Action<\/span> {<\/span>\r\n  type<\/span>:<\/span> \"<\/span>INCREMENT<\/span>\"<\/span> |<\/span> \"<\/span>DECREMENT<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> reducer<\/span>:<\/span> Reducer<\/span><<\/span>State<\/span>,<\/span> Action<\/span>><\/span> =<\/span> (<\/span>state<\/span>,<\/span> action<\/span>)<\/span> =><\/span> {<\/span>\r\n  switch <\/span>(<\/span>action<\/span>.<\/span>type<\/span>)<\/span> {<\/span>\r\n    case<\/span> \"<\/span>INCREMENT<\/span>\"<\/span>:<\/span>\r\n      return<\/span> {<\/span> count<\/span>:<\/span> state<\/span>.<\/span>count<\/span> +<\/span> 1<\/span> };<\/span>\r\n    case<\/span> \"<\/span>DECREMENT<\/span>\"<\/span>:<\/span>\r\n      return<\/span> {<\/span> count<\/span>:<\/span> state<\/span>.<\/span>count<\/span> -<\/span> 1<\/span> };<\/span>\r\n    default<\/span>:<\/span>\r\n      return<\/span> state<\/span>;<\/span>\r\n  }<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> reducer<\/span>;<\/span>\r\n<\/code><\/pre>\n
import<\/span> React<\/span>,<\/span> {<\/span> useReducer<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> reducer<\/span> from<\/span> \"<\/span>.\/Reducer<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> Counter<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>state<\/span>,<\/span> dispatch<\/span>]<\/span> =<\/span> useReducer<\/span>(<\/span>reducer<\/span>,<\/span> {<\/span> count<\/span>:<\/span> 0<\/span> });<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Count: {<\/span>state<\/span>.<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> dispatch<\/span>({<\/span> type<\/span>:<\/span> \"<\/span>INCREMENT<\/span>\"<\/span> })<\/span>}<\/span>><\/span>Increment<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> dispatch<\/span>({<\/span> type<\/span>:<\/span> \"<\/span>DECREMENT<\/span>\"<\/span> })<\/span>}<\/span>><\/span>Decrement<\/<\/span>button<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> Counter<\/span>;<\/span>\r\n<\/code><\/pre>\n
2. \u7ed3\u5408\u4f7f\u7528useReducer\u548cContext<\/h3>\n
\u901a\u8fc7\u5c06 useReducer \u4e0e Context \u7ed3\u5408\u4f7f\u7528\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5168\u5c40\u72b6\u6001\u7ba1\u7406\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u591a\u4e2a\u7ec4\u4ef6\u53ef\u4ee5\u5f15\u7528\u76f8\u540c\u7684\u72b6\u6001\u3002<\/p>\n
import<\/span> {<\/span> Reducer<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\n\r\nexport<\/span> interface<\/span> State<\/span> {<\/span>\r\n  count<\/span>:<\/span> number<\/span>;<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> interface<\/span> Action<\/span> {<\/span>\r\n  type<\/span>:<\/span> \"<\/span>INCREMENT<\/span>\"<\/span> |<\/span> \"<\/span>DECREMENT<\/span>\"<\/span>;<\/span>\r\n}<\/span>\r\n\r\nconst<\/span> reducer<\/span>:<\/span> Reducer<\/span><<\/span>State<\/span>,<\/span> Action<\/span>><\/span> =<\/span> (<\/span>state<\/span>,<\/span> action<\/span>)<\/span> =><\/span> {<\/span>\r\n  switch <\/span>(<\/span>action<\/span>.<\/span>type<\/span>)<\/span> {<\/span>\r\n    case<\/span> \"<\/span>INCREMENT<\/span>\"<\/span>:<\/span>\r\n      return<\/span> {<\/span> count<\/span>:<\/span> state<\/span>.<\/span>count<\/span> +<\/span> 1<\/span> };<\/span>\r\n    case<\/span> \"<\/span>DECREMENT<\/span>\"<\/span>:<\/span>\r\n      return<\/span> {<\/span> count<\/span>:<\/span> state<\/span>.<\/span>count<\/span> -<\/span> 1<\/span> };<\/span>\r\n    default<\/span>:<\/span>\r\n      return<\/span> state<\/span>;<\/span>\r\n  }<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> reducer<\/span>;<\/span>\r\n<\/code><\/pre>\n
import<\/span> {<\/span> ReactNode<\/span>,<\/span> createContext<\/span>,<\/span> useReducer<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> reducer<\/span>,<\/span> {<\/span> Action<\/span>,<\/span> State<\/span> }<\/span> from<\/span> \"<\/span>.\/Reducer<\/span>\"<\/span>;<\/span>\r\n\r\n\r\ninterface<\/span> CounterContextProps<\/span> {<\/span>\r\n  state<\/span>:<\/span> State<\/span>;<\/span>\r\n  dispatch<\/span>:<\/span> React<\/span>.<\/span>Dispatch<\/span><<\/span>Action<\/span>><\/span>;<\/span>\r\n}<\/span>\r\n\r\nexport<\/span> const<\/span> CounterContext<\/span> =<\/span> createContext<\/span><<\/span>CounterContextProps<\/span> |<\/span> undefined<\/span>><\/span>(<\/span>\r\n  undefined<\/span>\r\n);<\/span>\r\n\r\nconst<\/span> initialState<\/span> =<\/span> {<\/span> count<\/span>:<\/span> 0<\/span> };<\/span>\r\n\r\nconst<\/span> CounterProvider<\/span>:<\/span> React<\/span>.<\/span>FC<\/span><<\/span>{<\/span> children<\/span>:<\/span> ReactNode<\/span> }<\/span>><\/span> =<\/span> ({<\/span> children<\/span> })<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>state<\/span>,<\/span> dispatch<\/span>]<\/span> =<\/span> useReducer<\/span>(<\/span>reducer<\/span>,<\/span> initialState<\/span>);<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>CounterContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>{<\/span> state<\/span>,<\/span> dispatch<\/span> }<\/span>}<\/span>><\/span>\r\n      {<\/span>children<\/span>}<\/span>\r\n    <\/<\/span>CounterContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> CounterProvider<\/span>;<\/span>\r\n<\/code><\/pre>\n
import<\/span> React<\/span>,<\/span> {<\/span> useContext<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> CounterContext<\/span> }<\/span> from<\/span> \"<\/span>.\/CounterProvider<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> CounterControls<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> {<\/span> dispatch<\/span> }<\/span> =<\/span> useContext<\/span>(<\/span>CounterContext<\/span>)<\/span>!<\/span>;<\/span> \/\/ \u975enull\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u6f14\u7b97\u5b50<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> dispatch<\/span>({<\/span> type<\/span>:<\/span> \"<\/span>INCREMENT<\/span>\"<\/span> })<\/span>}<\/span>><\/span>Increment<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> dispatch<\/span>({<\/span> type<\/span>:<\/span> \"<\/span>DECREMENT<\/span>\"<\/span> })<\/span>}<\/span>><\/span>Decrement<\/<\/span>button<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> CounterControls<\/span>;<\/span>\r\n<\/code><\/pre>\n
import<\/span> React<\/span>,<\/span> {<\/span> useContext<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> CounterContext<\/span> }<\/span> from<\/span> \"<\/span>.\/CounterProvider<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> Counter<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> {<\/span> state<\/span>,<\/span> dispatch<\/span> }<\/span> =<\/span> useContext<\/span>(<\/span>CounterContext<\/span>)<\/span>!<\/span>;<\/span> \/\/ \u975enull\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u6f14\u7b97\u5b50<\/span>\r\n\r\n  return <\/span>(<\/span>\r\n    <<\/span>div<\/span>><\/span>\r\n      <<\/span>p<\/span>><\/span>Count: {<\/span>state<\/span>.<\/span>count<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> dispatch<\/span>({<\/span> type<\/span>:<\/span> \"<\/span>INCREMENT<\/span>\"<\/span> })<\/span>}<\/span>><\/span>Increment<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> dispatch<\/span>({<\/span> type<\/span>:<\/span> \"<\/span>DECREMENT<\/span>\"<\/span> })<\/span>}<\/span>><\/span>Decrement<\/<\/span>button<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> Counter<\/span>;<\/span>\r\n<\/code><\/pre>\n
3. useReducer\u7684\u4f18\u52bf\u662f\u4ec0\u4e48\uff1f<\/h3>\n
\u8907\u96d1\u306a\u72b6\u614b\u7ba1\u7406: useReducer\u306f\u72b6\u614b\u306e\u8907\u96d1\u306a\u30ed\u30b8\u30c3\u30af\u3092\u5206\u96e2\u3057\u3084\u3059\u304f\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u3088\u308a\u5358\u7d14\u3067\u7406\u89e3\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u72b6\u614b\u7ba1\u7406: Context\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u72b6\u614b\u7ba1\u7406\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002\u7570\u306a\u308b\u968e\u5c64\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u540c\u3058\u72b6\u614b\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n
\u53ef\u8aad\u6027\u3068\u4fdd\u5b88\u6027: useReducer\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u6301\u3064\u30ed\u30b8\u30c3\u30af\u304c\u3088\u308a\u4e00\u8cab\u3057\u3066\u3044\u3066\u3001\u4fdd\u5b88\u6027\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n
4. \u603b\u7ed3<\/h3>\n
useReducer\u662fReact\u5e94\u7528\u7a0b\u5e8f\u4e2d\u5904\u7406\u590d\u6742\u72b6\u6001\u7ba1\u7406\u7684\u5f3a\u5927\u5de5\u5177\u3002\u901a\u8fc7\u6b63\u786e\u4f7f\u7528\u5b83\uff0c\u53ef\u4ee5\u63d0\u9ad8\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff0c\u7f16\u5199\u7075\u6d3b\u9ad8\u6548\u7684\u4ee3\u7801\u3002<\/p>\n
\u672c\u7bc7\u6587\u7ae0\u662f\u4e3a\u4e86\u5e2e\u52a9\u521d\u5b66\u8005\u5927\u5b66\u751f\u7406\u89e3React Next\u800c\u51c6\u5907\u7684\u8f93\u51fa\u8d44\u6599\u3002\u6b22\u8fce\u7559\u4e0b\u9519\u8bef\u3001\u610f\u89c1\u7b49\u8bc4\u8bba\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4f7f\u7528 useReducer \u8fdb\u884c\u72b6\u6001\u7ba1\u7406 React Hooks \u63d0\u4f9b\u4e86\u4e00\u79cd\u5f88\u68d2\u7684\u5de5\u5177\uff0c\u7528\u4e8e\u5904\u7406\u51fd\u6570\u7ec4\u4ef6\u4e2d\u7684\u72b6 […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38068","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u3010React\u3011\u5c1d\u8bd5\u4f7f\u7528useReducer - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010react\u3011\u5c1d\u8bd5\u4f7f\u7528usereducer\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010React\u3011\u5c1d\u8bd5\u4f7f\u7528useReducer\" \/>\n<meta property=\"og:description\" content=\"\u4f7f\u7528 useReducer \u8fdb\u884c\u72b6\u6001\u7ba1\u7406 React Hooks \u63d0\u4f9b\u4e86\u4e00\u79cd\u5f88\u68d2\u7684\u5de5\u5177\uff0c\u7528\u4e8e\u5904\u7406\u51fd\u6570\u7ec4\u4ef6\u4e2d\u7684\u72b6 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010react\u3011\u5c1d\u8bd5\u4f7f\u7528usereducer\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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