{"id":38418,"date":"2023-08-12T01:56:31","date_gmt":"2023-02-18T15:53:57","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8react%e5%92%8ctypescript%ef%bc%9a%e9%80%9a%e8%bf%87reducer%e5%92%8ccontext%e6%9d%a5%e6%8f%90%e9%ab%98%e5%8f%af%e6%89%a9%e5%b1%95%e6%80%a7%e3%80%82\/"},"modified":"2024-04-30T18:10:22","modified_gmt":"2024-04-30T10:10:22","slug":"%e4%bd%bf%e7%94%a8react%e5%92%8ctypescript%ef%bc%9a%e9%80%9a%e8%bf%87reducer%e5%92%8ccontext%e6%9d%a5%e6%8f%90%e9%ab%98%e5%8f%af%e6%89%a9%e5%b1%95%e6%80%a7%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8react%e5%92%8ctypescript%ef%bc%9a%e9%80%9a%e8%bf%87reducer%e5%92%8ccontext%e6%9d%a5%e6%8f%90%e9%ab%98%e5%8f%af%e6%89%a9%e5%b1%95%e6%80%a7%e3%80%82\/","title":{"rendered":"\u4f7f\u7528React\u548cTypeScript\uff1a\u901a\u8fc7Reducer\u548cContext\u6765\u63d0\u9ad8\u53ef\u6269\u5c55\u6027"},"content":{"rendered":"

React\u5b98\u65b9\u7f51\u7ad9\u7684\u6587\u6863\u5df2\u4e8e2023\u5e743\u670816\u65e5\u8fdb\u884c\u4e86\u4fee\u8ba2\uff08\u8bf7\u53c2\u8003”Introducing react.dev”\uff09\u3002\u672c\u6587\u662f\u5bf9\u57fa\u7840\u89e3\u8bf4\u4e2d”Scaling Up with Reducer and Context”\u7684\u7b80\u8981\u603b\u7ed3\u3002\u4f46\u662f\uff0c\u6211\u4eec\u5728\u4ee3\u7801\u4e2d\u6dfb\u52a0\u4e86TypeScript\u3002\u4e0e\u6b64\u76f8\u53cd\uff0c\u6211\u4eec\u7701\u7565\u4e86\u9762\u5411\u521d\u5b66\u8005\u7684JavaScript\u57fa\u7840\u8bf4\u660e\u3002<\/p>\n

\u6b64\u5916\uff0c\u8bf7\u53c2\u9605\u5176\u4ed6\u6709\u5173\u672c\u7cfb\u5217\u89e3\u8bf4\u7684\u6587\u7ae0”React + TypeScript\uff1a\u5b66\u4e60React\u5b98\u65b9\u6587\u6863\u7684\u57fa\u672c\u89e3\u8bf4\u300a\u5b66\u4e60React\u300b”\u3002<\/p>\n

\u7ebd\u7ea6\u662f\u7f8e\u56fd\u7684\u4e00\u4e2a\u5927\u57ce\u5e02\uff0c\u4f4d\u4e8e\u7f8e\u56fd\u4e1c\u6d77\u5cb8\u3002\u5b83\u662f\u7f8e\u56fd\u6700\u5927\u7684\u57ce\u5e02\u4e4b\u4e00\uff0c\u4e5f\u662f\u7ecf\u6d4e\u3001\u91d1\u878d\u548c\u6587\u5316\u4e2d\u5fc3\u3002\u7ebd\u7ea6\u62e5\u6709\u8bb8\u591a\u8457\u540d\u7684\u5730\u6807\uff0c\u5982\u81ea\u7531\u5973\u795e\u50cf\u3001\u5e1d\u56fd\u5927\u53a6\u548c\u65f6\u4ee3\u5e7f\u573a\u3002<\/p>\n

\u5c06\u51cf\u901f\u5668\u548c\u4e0a\u4e0b\u6587\u7ed3\u5408\u5728\u4e00\u8d77<\/h1>\n

\u4e0b\u9762\u7684\u793a\u4f8b001\u57fa\u672c\u4e0a\u548c\u201cReact + TypeScript: \u5c06\u72b6\u6001\u903b\u8f91\u63d0\u53d6\u5230\u51cf\u901f\u5668\u4e2d\u201d\u4e2d\u7684\u793a\u4f8b002\u7684\u4ee3\u7801\u5185\u5bb9\u76f8\u540c\u3002src\/tasksReducer.ts\u6a21\u5757\u7684\u51cf\u901f\u5668\u51fd\u6570tasksReducer\u8d1f\u8d23\u6240\u6709\u72b6\u6001\u66f4\u65b0\u903b\u8f91\u3002<\/p>\n

\u7528Reducer\u548cContext\u6269\u5c55React + TypeScript\u7684\u6837\u672c001\u25a0\uff1a\u6269\u5c55\u9002\u7528\u8303\u56f4<\/h4>\n

 <\/p>\n

\u4f7f\u7528reducer\u7684\u597d\u5904\u662f\u53ef\u4ee5\u4fdd\u6301\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u7b80\u77ed\u800c\u7b80\u6d01\u3002\u7136\u800c\uff0c\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u72b6\u6001(tasks)\u548cdispatch\u51fd\u6570\u662f\u4f5c\u4e3a\u9876\u5c42\u5e94\u7528\u7a0b\u5e8f(TaskApp)\u7ec4\u4ef6\u7684\u4e00\u90e8\u5206\u624d\u53ef\u4ee5\u4f7f\u7528\u7684\u3002\u8981\u8ba9\u6811\u4e2d\u7684\u5b50\u7ec4\u4ef6\u80fd\u591f\u8bfb\u53d6\u6216\u66f4\u6539\u72b6\u6001\uff0c\u5fc5\u987b\u5c06\u72b6\u6001\u548c\u66f4\u6539\u7684\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u4f5c\u4e3a\u5c5e\u6027\u4f20\u9012\u7ed9\u5b83\u4eec\uff08\u8bf7\u53c2\u9605\u201c\u5411\u7ec4\u4ef6\u4f20\u9012\u5c5e\u6027\u201d\uff09\u3002\u968f\u7740\u5e94\u7528\u7a0b\u5e8f\u53d8\u5f97\u8d8a\u6765\u8d8a\u5927\uff0c\u8fd9\u53ef\u80fd\u662f\u4e00\u4e2a\u95ee\u9898\u3002<\/p>\n

export<\/span> default<\/span> function<\/span> TaskApp<\/span>()<\/span> {<\/span>\r\n\r\n\treturn <\/span>(<\/span>\r\n\t\t<><\/span>\r\n\r\n\t\t\t<<\/span>TaskList<\/span>\r\n\t\t\t\ttasks<\/span>=<\/span>{<\/span>tasks<\/span>}<\/span>\r\n\t\t\t\tonChangeTask<\/span>=<\/span>{<\/span>handleChangeTask<\/span>}<\/span>\r\n\t\t\t\tonDeleteTask<\/span>=<\/span>{<\/span>handleDeleteTask<\/span>}<\/span>\r\n\t\t\t\/><\/span>\r\n\t\t<\/><\/span>\r\n\t);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
export<\/span> const<\/span> TaskList<\/span>:<\/span> FC<\/span><<\/span>TaskListProps<\/span>><\/span> =<\/span> ({<\/span>\r\n\ttasks<\/span>,<\/span>\r\n\tonChangeTask<\/span>,<\/span>\r\n\tonDeleteTask<\/span>\r\n})<\/span> =><\/span> {<\/span>\r\n\treturn <\/span>(<\/span>\r\n\t\t<<\/span>ul<\/span>><\/span>\r\n\t\t\t{<\/span>tasks<\/span>.<\/span>map<\/span>((<\/span>task<\/span>)<\/span> =><\/span> (<\/span>\r\n\t\t\t\t<<\/span>li<\/span> key<\/span>=<\/span>{<\/span>task<\/span>.<\/span>id<\/span>}<\/span>><\/span>\r\n\t\t\t\t\t<<\/span>Task<\/span> task<\/span>=<\/span>{<\/span>task<\/span>}<\/span> onChange<\/span>=<\/span>{<\/span>onChangeTask<\/span>}<\/span> onDelete<\/span>=<\/span>{<\/span>onDeleteTask<\/span>}<\/span> \/><\/span>\r\n\t\t\t\t<\/<\/span>li<\/span>><\/span>\r\n\t\t\t))<\/span>}<\/span>\r\n\t\t<\/<\/span>ul<\/span>><\/span>\r\n\t);<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u662f\u50cf\u524d\u8ff0\u7684\u6837\u672c001\u4e00\u6837\u7684\u7ec4\u4ef6\u6570\u91cf\u548c\u6811\u72b6\u5c42\u6b21\uff0c\u90a3\u4e48\u6ca1\u6709\u4ec0\u4e48\u7279\u522b\u7684\u95ee\u9898\u3002\u4f46\u662f\uff0c\u5f53\u7ec4\u4ef6\u6570\u91cf\u589e\u52a0\u5e76\u4e14\u5fc5\u987b\u5c06\u5c5e\u6027\u4f20\u9012\u7ed9\u6df1\u5c42\u5b50\u7ec4\u4ef6\u65f6\uff0c\u8fd9\u53ef\u80fd\u4f1a\u53d8\u5f97\u76f8\u5f53\u9ebb\u70e6\u3002<\/p>\n
\u6240\u4ee5\uff0c\u4e0a\u4e0b\u6587\u5c31\u6d3e\u4e0a\u7528\u573a\u4e86\u3002\u5982\u679c\u5c06\u72b6\u6001(tasks)\u548cdispatch\u51fd\u6570\u653e\u7f6e\u5728\u4e0a\u4e0b\u6587\u4e2d\uff0c\u5c31\u53ef\u4ee5\u907f\u514d\u5c5e\u6027\u7684\u94fe\u5f0f\u4f20\u9012\uff08\u53c2\u8003”React + TypeScript: \u5728\u4e0a\u4e0b\u6587\u4e2d\u4f20\u9012\u6570\u636e\u5230\u6df1\u5c42\u7ec4\u4ef6”\uff09\u3002TaskApp\u6811\u7684\u5b50\u7ec4\u4ef6\u53ef\u4ee5\u4ece\u4e0a\u4e0b\u6587\u4e2d\u8bfb\u53d6\u72b6\u6001\uff0c\u800c\u4e0d\u662f\u4ece\u5c5e\u6027\u4e2d\u8bfb\u53d6\uff0c\u5e76\u4e14\u53ef\u4ee5\u8c03\u7528dispatch\u51fd\u6570\u3002<\/p>\n
\u8ba9\u6211\u4eec\u89e3\u91ca\u4e00\u4e0b\u5c06Reducer\u548cContext\u7ec4\u5408\u4f7f\u7528\u7684\u4ee5\u4e0b3\u4e2a\u6b65\u9aa4\u3002<\/p>\n
    \n
  1. \n
      \u5efa\u7acb\u4e0a\u4e0b\u6587\u3002<\/ol>\n<\/li>\n<\/ol>\n
       <\/p>\n
        \n
      1. \n
          \u5c06\u72b6\u6001\u548cdispatch\u51fd\u6570\u6dfb\u52a0\u5230\u4e0a\u4e0b\u6587\u4e2d\u3002<\/ol>\n<\/li>\n<\/ol>\n
           <\/p>\n
            \u4efb\u4f55\u5730\u65b9(\u4e0d\u9650\u5c42\u7ea7)\u90fd\u53ef\u4ee5\u4f7f\u7528\u4e0a\u4e0b\u6587\u3002<\/ol>\n
            \u6b65\u9aa41\uff1a\u6784\u5efa\u4e0a\u4e0b\u6587<\/h2>\n
            \u5728\u6839\u6a21\u5757src\/App.tsx\u4e2d\u7684\u7ec4\u4ef6TaskApp\u901a\u8fc7useReducer\u94a9\u5b50\uff0c\u83b7\u5f97\u4e86\u72b6\u6001\uff08task\uff09\u548cdispatch\u51fd\u6570\u3002<\/p>\n
            export<\/span> default<\/span> function<\/span> TaskApp<\/span>()<\/span> {<\/span>\r\n\tconst<\/span> [<\/span>tasks<\/span>,<\/span> dispatch<\/span>]<\/span> =<\/span> useReducer<\/span>(<\/span>tasksReducer<\/span>,<\/span> initialTasks<\/span>);<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
            \u65b0\u89c4\u5b9a\u7684\u662f\u4ee5\u4e0b\u4e0a\u4e0b\u6587\u6a21\u5757src\/TasksContext.ts\u3002\u6211\u4eec\u5c06\u521b\u5efa\u4e24\u4e2a\u7528\u4e8e\u4f20\u9012\u7ed9\u6811\u7684\u4e0b\u5c42\u7684\u4e0a\u4e0b\u6587\uff08\u8bf7\u53c2\u8003\u201c\u6b65\u9aa41\uff1a\u521b\u5efa\u4e0a\u4e0b\u6587\u201d\uff09\u3002\u7531\u4e8eTaskApp\u63d0\u4f9b\u4e86\u4e0a\u4e0b\u6587\u7684\u503c\uff0c\u56e0\u6b64\u4f20\u9012\u7ed9createContext\u7684\u9ed8\u8ba4\u503c\u53ef\u4ee5\u662fnull\u3002<\/p>\n
            TasksContext: \u72b6\u614b\u3068\u306a\u308b\u30bf\u30b9\u30af\u30ea\u30b9\u30c8(tasks)\u3002<\/p>\n
            TasksDispatchContext: \u72b6\u614b\u5909\u66f4\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u9001\u308bdispatch\u95a2\u6570\u3002<\/p>\n
            \u8bf7\u5c06\u4e0a\u4e0b\u6587\u4ee5\u5404\u81ea\u53ef\u88ab\u5176\u4ed6\u6a21\u5757\u4f7f\u7528\uff08\u80fd\u591f\u8fdb\u884c\u5bfc\u5165\uff09\u7684\u65b9\u5f0f\u8fdb\u884c\u5bfc\u51fa\u3002<\/p>\n
            import<\/span> {<\/span> createContext<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> type<\/span> {<\/span> Dispatch<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> type<\/span> {<\/span> TaskType<\/span> }<\/span> from<\/span> \"<\/span>.\/App<\/span>\"<\/span>;<\/span>\r\nimport<\/span> type<\/span> {<\/span> ActionType<\/span> }<\/span> from<\/span> \"<\/span>.\/tasksReducer<\/span>\"<\/span>;<\/span>\r\n\r\nexport<\/span> const<\/span> TasksContext<\/span> =<\/span> createContext<\/span><<\/span>TaskType<\/span>[]<\/span> |<\/span> null<\/span>><\/span>(<\/span>null<\/span>);<\/span>\r\nexport<\/span> const<\/span> TasksDispatchContext<\/span> =<\/span> createContext<\/span><<\/span>Dispatch<\/span><<\/span>ActionType<\/span>><\/span> |<\/span> null<\/span>><\/span>(<\/span>\r\n\tnull<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
            \u540c\u65f6\uff0c\u6211\u4eec\u4e5f\u5bfc\u51fa\u4e86\u5728\u4e0a\u4e0b\u6587\u6a21\u5757(src\/TasksContext.ts)\u4e2d\u4f7f\u7528\u7684\u7c7b\u578bActionType\uff0c\u8be5\u7c7b\u578b\u5728\u51cf\u5c11\u5668(src\/tasksReducer.ts)\u4e2d\u5b9a\u4e49\u3002<\/p>\n
            \/\/ type ActionType =<\/span>\r\nexport<\/span> type<\/span> ActionType<\/span> =<\/span>\r\n\t|<\/span> {<\/span> type<\/span>:<\/span> \"<\/span>added<\/span>\"<\/span>;<\/span> id<\/span>:<\/span> number<\/span>;<\/span> text<\/span>:<\/span> string<\/span> }<\/span>\r\n\t|<\/span> {<\/span> type<\/span>:<\/span> \"<\/span>changed<\/span>\"<\/span>;<\/span> task<\/span>:<\/span> TaskType<\/span> }<\/span>\r\n\t|<\/span> {<\/span> type<\/span>:<\/span> \"<\/span>deleted<\/span>\"<\/span>;<\/span> id<\/span>:<\/span> number<\/span> };<\/span>\r\n<\/code><\/pre>\n
            \u6b65\u9aa42\uff1a\u5c06\u72b6\u6001\u548cdispatch\u51fd\u6570\u6dfb\u52a0\u5230\u4e0a\u4e0b\u6587\u4e2d<\/h2>\n
            \u5728\u4e2d\u56fd\u7684\u672c\u5730\u5316\u4e2d\uff0c\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879\uff1a<\/p>\n
            \u5c06\u4e24\u4e2a\u4e0a\u4e0b\u6587\u5bfc\u5165\u7684\u662f\u6839\u6a21\u5757src\/App.tsx\u3002\u8bf7\u4f7f\u7528TaskApp\u7ec4\u4ef6\u8fd4\u56de\u7684JSX\u5728\u4e24\u4e2a\u4e0a\u4e0b\u6587\u63d0\u4f9b\u8005Provider\u4e2d\u5305\u88c5\u8d77\u6765\u3002\u5728value\u5c5e\u6027\u4e2d\uff0c\u5206\u522b\u63d0\u4f9b\u6765\u81eauseReducer\u7684\u72b6\u6001task\u548c\u51fd\u6570dispatch\uff0c\u4ee5\u4fbf\u5728\u6574\u4e2a\u4e0b\u5c42\u6811\u4e2d\u4f7f\u7528\uff08\u53c2\u89c1\u201c\u6b65\u9aa43\uff1a\u63d0\u4f9b\u4e0a\u4e0b\u6587\u201d\uff09\u3002<\/p>\n
            import<\/span> {<\/span> TasksContext<\/span>,<\/span> TasksDispatchContext<\/span> }<\/span> from<\/span> \"<\/span>.\/TasksContext<\/span>\"<\/span>;<\/span>\r\n\r\nexport<\/span> default<\/span> function<\/span> TaskApp<\/span>()<\/span> {<\/span>\r\n\tconst<\/span> [<\/span>tasks<\/span>,<\/span> dispatch<\/span>]<\/span> =<\/span> useReducer<\/span>(<\/span>tasksReducer<\/span>,<\/span> initialTasks<\/span>);<\/span>\r\n\r\n\treturn <\/span>(<\/span>\r\n\t\t\/\/ <><\/span>\r\n\t\t<<\/span>TasksContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>tasks<\/span>}<\/span>><\/span>\r\n\t\t\t<<\/span>TasksDispatchContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>dispatch<\/span>}<\/span>><\/span>\r\n\r\n\t\t\t<\/<\/span>TasksDispatchContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n\t\t<\/<\/span>TasksContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n\t\t\/* <\/> *\/<\/span>\r\n\t);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
            \u6b65\u9aa43: \u5728\u6811\u4e2d\u4f7f\u7528\u4e0a\u4e0b\u6587<\/h2>\n
            \u8fd9\u6837\uff0c\u6211\u4eec\u4e0d\u9700\u8981\u5728\u5c5e\u6027\u4e2d\u5c06\u72b6\u6001\u548c\u76f8\u5e94\u7684\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u4f20\u9012\u5230\u6811\u7684\u5b50\u7ec4\u4ef6\u4e2d\u3002\u9996\u5148\uff0c\u5728AddTask\u7ec4\u4ef6\u4e2d\uff0c\u4ece\u5c5e\u6027\u4e2d\u79fb\u9664\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f(AddTask)\u3002<\/p>\n
            \/\/ let nextId = 3;<\/span>\r\n\r\nexport<\/span> default<\/span> function<\/span> TaskApp<\/span>()<\/span> {<\/span>\r\n\r\n\t\/* const handleAddTask = (text: string) => {\r\n\t\tdispatch({\r\n\t\t\ttype: \"added\",\r\n\t\t\tid: nextId++,\r\n\t\t\ttext: text\r\n\t\t});\r\n\t}; *\/<\/span>\r\n\r\n\treturn <\/span>(<\/span>\r\n\t\t<<\/span>TasksContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>tasks<\/span>}<\/span>><\/span>\r\n\t\t\t<<\/span>TasksDispatchContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>dispatch<\/span>}<\/span>><\/span>\r\n\r\n\t\t\t\t{<\/span>\/* <AddTask onAddTask={handleAddTask} \/> *\/<\/span>}<\/span>\r\n\t\t\t\t<<\/span>AddTask<\/span> \/><\/span>\r\n\r\n\t\t\t<\/<\/span>TasksDispatchContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n\t\t<\/<\/span>TasksContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n\t);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
            AddTask.tsx\u6a21\u5757\u5bfc\u5165\u7684\u662fTasksDispatchContext\u4e0a\u4e0b\u6587\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7useContext\u51fd\u6570\u83b7\u53d6dispatch\u51fd\u6570\uff0c\u7136\u540e\u76f4\u63a5\u53d1\u9001\u9644\u52a0\u64cd\u4f5c\uff08\u7c7b\u578b\u4e3a’added’\uff09\u3002
            \n\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4eceTasksDispatchContext\u4e0a\u4e0b\u6587\u83b7\u53d6\u7684\u503c\u53ef\u80fd\u4e3anull\uff0c\u5728TypeScript\u4e2d\u9700\u8981\u8fdb\u884c\u5224\u65ad\u3002
            \n\u73b0\u5728AddTask\u7ec4\u4ef6\u4e0d\u518d\u63a5\u6536\u4efb\u4f55\u4ece\u7236\u7ec4\u4ef6\u4f20\u9012\u8fc7\u6765\u7684\u5c5e\u6027\u3002<\/p>\n
            \/\/ import { useState } from 'react';<\/span>\r\nimport<\/span> {<\/span> useContext<\/span>,<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nimport<\/span> {<\/span> TasksDispatchContext<\/span> }<\/span> from<\/span> '<\/span>.\/TasksContext<\/span>'<\/span>;<\/span>\r\n\r\nlet<\/span> nextId<\/span> =<\/span> 3<\/span>;<\/span>\r\n\/\/ export const AddTask: FC<Props> = ({ onAddTask }) => {<\/span>\r\nexport<\/span> const<\/span> AddTask<\/span>:<\/span> FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n\r\n\tconst<\/span> dispatch<\/span> =<\/span> useContext<\/span>(<\/span>TasksDispatchContext<\/span>);<\/span>\r\n\r\n\treturn <\/span>(<\/span>\r\n\t\t<><\/span>\r\n\r\n\t\t\t<<\/span>button<\/span>\r\n\t\t\t\tonClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> {<\/span>\r\n\t\t\t\t\tsetText<\/span>(<\/span>''<\/span>);<\/span>\r\n\t\t\t\t\tif <\/span>(<\/span>!<\/span>dispatch<\/span>)<\/span> return<\/span>;<\/span>\r\n\t\t\t\t\t\/\/ onAddTask(text);<\/span>\r\n\t\t\t\t\tdispatch<\/span>({<\/span>\r\n\t\t\t\t\t\ttype<\/span>:<\/span> '<\/span>added<\/span>'<\/span>,<\/span>\r\n\t\t\t\t\t\tid<\/span>:<\/span> nextId<\/span>++<\/span>,<\/span>\r\n\t\t\t\t\t\ttext<\/span>:<\/span> text<\/span>\r\n\t\t\t\t\t});<\/span>\r\n\t\t\t\t}<\/span>}<\/span>\r\n\t\t\t><\/span>\r\n\t\t\t\tAdd\r\n\t\t\t<\/<\/span>button<\/span>><\/span>\r\n\t\t<\/><\/span>\r\n\t);<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
            \u63a5\u4e0b\u6765\uff0c\u662fTaskList\u7ec4\u4ef6\u3002\u6211\u4eec\u5c06\u4ece\u5c5e\u6027\u4e2d\u79fb\u9664\u72b6\u6001\uff08tasks\uff09\u548c\u4e24\u4e2a\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\uff08onChangeTask\u548conDeleteTask\uff09\u3002\u8fd9\u6837\uff0c\u6211\u4eec\u4e5f\u6ca1\u6709\u4f20\u9012\u4efb\u4f55\u5c5e\u6027\u7ed9TaskList\u7ec4\u4ef6\u4e86\u3002<\/p>\n
            export<\/span> default<\/span> function<\/span> TaskApp<\/span>()<\/span> {<\/span>\r\n\r\n\t\/* const handleChangeTask = (task: TaskType) => {\r\n\t\tdispatch({\r\n\t\t\ttype: \"changed\",\r\n\t\t\ttask: task\r\n\t\t});\r\n\t};\r\n\tconst handleDeleteTask = (taskId: number) => {\r\n\t\tdispatch({\r\n\t\t\ttype: \"deleted\",\r\n\t\t\tid: taskId\r\n\t\t});\r\n\t}; *\/<\/span>\r\n\treturn <\/span>(<\/span>\r\n\t\t<<\/span>TasksContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>tasks<\/span>}<\/span>><\/span>\r\n\t\t\t<<\/span>TasksDispatchContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>dispatch<\/span>}<\/span>><\/span>\r\n\r\n\t\t\t\t{<\/span>\/* <TaskList\r\n\t\t\t\t\ttasks={tasks}\r\n\t\t\t\t\tonChangeTask={handleChangeTask}\r\n\t\t\t\t\tonDeleteTask={handleDeleteTask}\r\n\t\t\t\t\/> *\/<\/span>}<\/span>\r\n\t\t\t\t<<\/span>TaskList<\/span> \/><\/span>\r\n\t\t\t<\/<\/span>TasksDispatchContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n\t\t<\/<\/span>TasksContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n\t);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
            src\/TaskList.tsx\u6a21\u5757\u5bfc\u5165\u4e86\u4e24\u4e2a\u4e0a\u4e0b\u6587TasksContext\u548cTasksDispatchContext\u3002TaskList\u7ec4\u4ef6\u901a\u8fc7useContext\u83b7\u53d6\u7684\u72b6\u6001\u662ftask\uff08\u4e4b\u540e\u5728\u540c\u4e00\u6a21\u5757\u5185\u7684Task\u7ec4\u4ef6\u4e2d\u4f1a\u4f7f\u7528TasksDispatchContext\uff09\u3002\u8bf7\u786e\u4fdd\u4eceTasksContext\u4e0a\u4e0b\u6587\u83b7\u53d6\u7684\u503c\u4e0d\u4e3a\u7a7a\u3002<\/p>\n
            \/\/ import { useState } from 'react';<\/span>\r\nimport<\/span> {<\/span> useContext<\/span>,<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nimport<\/span> {<\/span> TasksContext<\/span>,<\/span> TasksDispatchContext<\/span> }<\/span> from<\/span> '<\/span>.\/TasksContext<\/span>'<\/span>;<\/span>\r\n\r\n\/* export const TaskList: FC<TaskListProps> = ({\r\n\ttasks,\r\n\tonChangeTask,\r\n\tonDeleteTask\r\n}) => { *\/<\/span>\r\nexport<\/span> const<\/span> TaskList<\/span>:<\/span> FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n\tconst<\/span> tasks<\/span> =<\/span> useContext<\/span>(<\/span>TasksContext<\/span>);<\/span>\r\n\treturn <\/span>(<\/span>\r\n\t\t<<\/span>ul<\/span>><\/span>\r\n\t\t\t{<\/span>\/* {tasks.map((task) => ( *\/<\/span>}<\/span>\r\n\t\t\t{<\/span>tasks<\/span> &&<\/span>\r\n\t\t\t\ttasks<\/span>.<\/span>map<\/span>((<\/span>task<\/span>)<\/span> =><\/span> (<\/span>\r\n\t\t\t\t\t<<\/span>li<\/span> key<\/span>=<\/span>{<\/span>task<\/span>.<\/span>id<\/span>}<\/span>><\/span>\r\n\t\t\t\t\t\t{<\/span>\/* <Task task={task} onChange={onChangeTask} onDelete={onDeleteTask} \/> *\/<\/span>}<\/span>\r\n\t\t\t\t\t\t<<\/span>Task<\/span> task<\/span>=<\/span>{<\/span>task<\/span>}<\/span> \/><\/span>\r\n\t\t\t\t\t<\/<\/span>li<\/span>><\/span>\r\n\t\t\t\t))<\/span>}<\/span>\r\n\t\t<\/<\/span>ul<\/span>><\/span>\r\n\t);<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
            Task\u7ec4\u4ef6\u4ece\u7236\u7ec4\u4ef6TaskList\u63a5\u6536\u5230\u5355\u72ec\u7684\u4efb\u52a1\uff08task\uff09\u3002\u7136\u800c\uff0c\u5728TasksDispatchContext\u4e0a\u53ef\u4ee5\u83b7\u53d6\u5230dispatch\u51fd\u6570\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u53bb\u9664\u5c5e\u6027\u4e0a\u7684\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u3002\u53ef\u4ee5\u901a\u8fc7dispatch\u51fd\u6570\u53d1\u9001\u4e0e\u4e8b\u4ef6\u5bf9\u5e94\u7684\u52a8\u4f5c\u3002<\/p>\n
            \/\/ const Task: FC<TaskProps> = ({ task, onChange, onDelete }) => {<\/span>\r\nconst<\/span> Task<\/span>:<\/span> FC<\/span><<\/span>TaskProps<\/span>><\/span> =<\/span> ({<\/span> task<\/span> })<\/span> =><\/span> {<\/span>\r\n\r\n\tconst<\/span> dispatch<\/span> =<\/span> useContext<\/span>(<\/span>TasksDispatchContext<\/span>);<\/span>\r\n\r\n\tif <\/span>(<\/span>isEditing<\/span>)<\/span> {<\/span>\r\n\t\ttaskContent<\/span> =<\/span> (<\/span>\r\n\t\t\t<><\/span>\r\n\t\t\t\t<<\/span>input<\/span>\r\n\t\t\t\t\tvalue<\/span>=<\/span>{<\/span>task<\/span>.<\/span>text<\/span>}<\/span>\r\n\t\t\t\t\tonChange<\/span>=<\/span>{<\/span>({<\/span> target<\/span>:<\/span> {<\/span> value<\/span> }<\/span> })<\/span> =><\/span> {<\/span>\r\n\t\t\t\t\t\t\/* onChange({\r\n\t\t\t\t\t\t\t...task,\r\n\t\t\t\t\t\t\ttext: value\r\n\t\t\t\t\t\t}); *\/<\/span>\r\n\t\t\t\t\t\tif <\/span>(<\/span>dispatch<\/span>)<\/span>\r\n\t\t\t\t\t\t\tdispatch<\/span>({<\/span> type<\/span>:<\/span> '<\/span>changed<\/span>'<\/span>,<\/span> task<\/span>:<\/span> {<\/span> ...<\/span>task<\/span>,<\/span> text<\/span>:<\/span> value<\/span> }<\/span> });<\/span>\r\n\t\t\t\t\t}<\/span>}<\/span>\r\n\t\t\t\t\/><\/span>\r\n\r\n\t\t\t<\/><\/span>\r\n\t\t);<\/span>\r\n\t}<\/span> else<\/span> {<\/span>\r\n\r\n\t}<\/span>\r\n\treturn <\/span>(<\/span>\r\n\t\t<<\/span>label<\/span>><\/span>\r\n\t\t\t<<\/span>input<\/span>\r\n\t\t\t\ttype<\/span>=<\/span>\"checkbox\"<\/span>\r\n\t\t\t\tchecked<\/span>=<\/span>{<\/span>task<\/span>.<\/span>done<\/span>}<\/span>\r\n\t\t\t\tonChange<\/span>=<\/span>{<\/span>({<\/span> target<\/span>:<\/span> {<\/span> checked<\/span> }<\/span> })<\/span> =><\/span> {<\/span>\r\n\t\t\t\t\t\/* onChange({\r\n\t\t\t\t\t\t...task,\r\n\t\t\t\t\t\tdone: checked\r\n\t\t\t\t\t}); *\/<\/span>\r\n\t\t\t\t\tif <\/span>(<\/span>dispatch<\/span>)<\/span> {<\/span>\r\n\t\t\t\t\t\tdispatch<\/span>({<\/span> type<\/span>:<\/span> '<\/span>changed<\/span>'<\/span>,<\/span> task<\/span>:<\/span> {<\/span> ...<\/span>task<\/span>,<\/span> done<\/span>:<\/span> checked<\/span> }<\/span> });<\/span>\r\n\t\t\t\t\t}<\/span>\r\n\t\t\t\t}<\/span>}<\/span>\r\n\t\t\t\/><\/span>\r\n\r\n\t\t\t{<\/span>\/* <button onClick={() => onDelete(task.id)}>Delete<\/button> *\/<\/span>}<\/span>\r\n\t\t\t<<\/span>button<\/span>\r\n\t\t\t\tonClick<\/span>=<\/span>{<\/span>()<\/span> =><\/span> {<\/span>\r\n\t\t\t\t\tif <\/span>(<\/span>dispatch<\/span>)<\/span> {<\/span>\r\n\t\t\t\t\t\tdispatch<\/span>({<\/span> type<\/span>:<\/span> '<\/span>deleted<\/span>'<\/span>,<\/span> id<\/span>:<\/span> task<\/span>.<\/span>id<\/span> });<\/span>\r\n\t\t\t\t\t}<\/span>\r\n\t\t\t\t}<\/span>}<\/span>\r\n\t\t\t><\/span>\r\n\t\t\t\tDelete\r\n\t\t\t<\/<\/span>button<\/span>><\/span>\r\n\t\t<\/<\/span>label<\/span>><\/span>\r\n\t);<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
            \u7ecf\u8fc7\u4e09\u4e2a\u6b65\u9aa4\uff0c\u6211\u4eec\u73b0\u5728\u6765\u770b\u4f8b\u5b50002\u3002\u72b6\u6001\u4ecd\u7531\u9876\u7ea7\u7684TaskApp\u7ec4\u4ef6\u4fdd\u6301\uff0c\u5e76\u7531useReducer\u8fdb\u884c\u7ba1\u7406\u3002\u4f46\u662f\uff0c\u73b0\u5728\u72b6\u6001\uff08tasks\uff09\u548cdispatch\u53ef\u4ee5\u4ece\u4efb\u4f55\u5b50\u7ec4\u4ef6\u4f7f\u7528\uff0c\u901a\u8fc7\u5bfc\u5165\u4e0a\u4e0b\u6587\u548c\u4f7f\u7528useContext\u6765\u5b9e\u73b0\u3002<\/p>\n
            \u6837\u54c1002\u25a0\u4f7f\u7528Reducer\u548c\u4e0a\u4e0b\u6587\u8fdb\u884cReact + TypeScript\u7684\u6269\u5c55<\/h4>\n
             <\/p>\n
            \u5c06reducer\u548ccontext\u5408\u5e76\u6210\u4e00\u4e2a\u6a21\u5757\u3002<\/h1>\n
            \u6211\u53ef\u4ee5\u5c06Reducer\u548c\u4e0a\u4e0b\u6587\u8fdb\u884c\u7ec4\u5408\u3002\u800c\u4e14\uff0c\u5c06\u5b83\u4eec\u5408\u5e76\u6210\u4e00\u4e2a\u6a21\u5757\u540e\uff0c\u7ec4\u4ef6\u4f1a\u663e\u5f97\u66f4\u52a0\u7b80\u6d01\u3002\u73b0\u5728\u6211\u53ea\u662f\u5728\u6a21\u5757src\/TasksContext.tsx\u4e2d\u521b\u5efa\u4e86\u4e24\u4e2a\u4e0a\u4e0b\u6587\uff0c\u5e76\u5c06\u903b\u8f91\u8fc1\u79fb\u5230\u90a3\u91cc\u3002<\/p>\n
            \u9996\u5148\uff0c\u5c06Context Provider\u4f5c\u4e3a\u65b0\u7684\u7ec4\u4ef6TasksProvider\u6765\u5b9a\u4e49\u5728src\/TasksContext.tsx\u4e2d\uff08\u6587\u4ef6\u6269\u5c55\u540d\u5df2\u66f4\u6539\u4e3atsx\uff09\u3002\u8bf7\u6ce8\u610f\uff0c\u5b83\u63a5\u6536children\u5c5e\u6027\uff0c\u5e76\u5c06\u5176\u4f5c\u4e3a\u5b50\u8282\u70b9\u6dfb\u52a0\u5230\u8fd4\u56de\u7684JSX\u4e2d\uff08”\u4f20\u9012\u5c5e\u6027\u7ed9\u7ec4\u4ef6”\uff09\u3002\u53e6\u5916\uff0cuseReducer\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u521d\u59cb\u503c\uff08initialTasks\uff09\u5df2\u4eceTaskApp\u7ec4\u4ef6\u4e2d\u79fb\u52a8\u8fc7\u6765\u3002<\/p>\n
            \/\/ import { createContext } from 'react';<\/span>\r\nimport<\/span> {<\/span> createContext<\/span>,<\/span> useReducer<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> initialTasks<\/span>:<\/span> TaskType<\/span>[]<\/span> =<\/span> [<\/span>\r\n\r\n];<\/span>\r\nexport<\/span> const<\/span> TasksProvider<\/span>:<\/span> FC<\/span><<\/span>Props<\/span>><\/span> =<\/span> ({<\/span> children<\/span> })<\/span> =><\/span> {<\/span>\r\n\tconst<\/span> [<\/span>tasks<\/span>,<\/span> dispatch<\/span>]<\/span> =<\/span> useReducer<\/span>(<\/span>tasksReducer<\/span>,<\/span> initialTasks<\/span>);<\/span>\r\n\treturn <\/span>(<\/span>\r\n\t\t<<\/span>TasksContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>tasks<\/span>}<\/span>><\/span>\r\n\t\t\t<<\/span>TasksDispatchContext<\/span>.<\/span>Provider<\/span> value<\/span>=<\/span>{<\/span>dispatch<\/span>}<\/span>><\/span>\r\n\t\t\t\t{<\/span>children<\/span>}<\/span>\r\n\t\t\t<\/<\/span>TasksDispatchContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n\t\t<\/<\/span>TasksContext<\/span>.<\/span>Provider<\/span>><\/span>\r\n\t);<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
            \u7136\u540e\uff0c\u6839\u6a21\u5757src\/App.tsx\u53ea\u662f\u7528\u5bfc\u5165\u7684TasksProvider\u7ec4\u4ef6\u5305\u88f9\u4e86TaskApp\u8fd4\u56de\u7684JSX\u3002\u4e0d\u518d\u4f7f\u7528reducer(tasksReducer)\u548c\u4e24\u4e2acontext(TasksContext\u548cTasksDispatchContext)\u3002\u8fd9\u6837\uff0c\u6811\u7684\u5b50\u8282\u70b9\u53ef\u4ee5\u4ece\u4efb\u4f55\u5730\u65b9\u83b7\u53d6\u4e0a\u4e0b\u6587\u3002<\/p>\n
            \/\/ import { useReducer } from 'react';<\/span>\r\n\r\n\/\/ import { TasksContext, TasksDispatchContext } from '.\/TasksContext';<\/span>\r\nimport<\/span> {<\/span> TasksProvider<\/span> }<\/span> from<\/span> '<\/span>.\/TasksContext<\/span>'<\/span>;<\/span>\r\n\/\/ import { tasksReducer } from '.\/tasksReducer';<\/span>\r\n\r\n\/* const initialTasks = [\r\n\t{ id: 0, text: 'Philosopher\u2019s Path', done: true },\r\n\t{ id: 1, text: 'Visit the temple', done: false },\r\n\t{ id: 2, text: 'Drink matcha', done: false }\r\n]; *\/<\/span>\r\nexport<\/span> default<\/span> function<\/span> TaskApp<\/span>()<\/span> {<\/span>\r\n\t\/\/ const [tasks, dispatch] = useReducer(tasksReducer, initialTasks);<\/span>\r\n\treturn <\/span>(<\/span>\r\n\t\t\/* <TasksContext.Provider value={tasks}>\r\n\t\t\t<TasksDispatchContext.Provider value={dispatch}> *\/<\/span>\r\n\t\t<<\/span>TasksProvider<\/span>><\/span>\r\n\t\t\t<<\/span>h1<\/span>><\/span>Day off in Kyoto<\/<\/span>h1<\/span>><\/span>\r\n\t\t\t<<\/span>AddTask<\/span> \/><\/span>\r\n\t\t\t<<\/span>TaskList<\/span> \/><\/span>\r\n\t\t\t{<\/span>\/* <\/TasksDispatchContext.Provider>\r\n\t\t<\/TasksContext.Provider> *\/<\/span>}<\/span>\r\n\t\t<\/<\/span>TasksProvider<\/span>><\/span>\r\n\t);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
            \u8bf7\u5c06Reducer\u7684\u903b\u8f91\u5b8c\u5168\u79fb\u52a8\u5230src\/TasksContext.tsx\u4e2d\uff08\u5220\u9664src\/tasksReducer.ts\uff09\u3002<\/p>\n
            export<\/span> const<\/span> tasksReducer<\/span>:<\/span> Reducer<\/span><<\/span>TaskType<\/span>[],<\/span> ActionType<\/span>><\/span> =<\/span> (<\/span>\r\n\ttasks<\/span>,<\/span>\r\n\taction<\/span>\r\n)<\/span> =><\/span> {<\/span>\r\n\tswitch <\/span>(<\/span>action<\/span>.<\/span>type<\/span>)<\/span> {<\/span>\r\n\r\n\t}<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
            \u8fbc\u307f\u5165\u3063\u305f\u72b6\u614b\u3068\u305d\u306e\u66f4\u65b0\u306e\u30ed\u30b8\u30c3\u30af\u306f\u3001\u30e2\u30b8\u30e5\u30fc\u30ebsrc\/TasksContext.tsx\u306b\u79fb\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u3001src\/App.tsx\u306f\u3059\u3063\u304d\u308a\u3057\u307e\u3057\u305f\u3002\u5404\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u30b3\u30fc\u30c9\u5168\u4f53\u3084\u52d5\u4f5c\u306b\u3064\u3044\u3066\u306f\u3001\u6b21\u306e\u30b5\u30f3\u30d7\u30eb003\u3092\u3054\u78ba\u8a8d\u304f\u3060\u3055\u3044\u3002<\/p>\n
            \u6837\u672c003\u25a0React + TypeScript\uff1a\u4f7f\u7528Reducer\u548cContext\u8fdb\u884c\u6269\u5c55 03<\/h4>\n
             <\/p>\n
            \u4ece\u81ea\u5b9a\u4e49\u7684hook\u4e2d\u8fd4\u56de\u72b6\u6001\u548cdispatch\u51fd\u6570\u3002<\/h2>\n
            \u6211\u4eec\u6765\u52a0\u4e00\u70b9\u5185\u5bb9\u3002\u5728\u65b0\u7684\u81ea\u5b9a\u4e49\u6302\u94a9(useTasksContext)\u4e2d\uff0c\u5c06\u72b6\u6001\u548cdispatch\u51fd\u6570\u4ece\u6a21\u5757src\/TasksContext.tsx\u4e2d\u5305\u542b\u5728\u5bf9\u8c61\u4e2d\u8fd4\u56de\u3002<\/p>\n
            \/\/ import { createContext, useReducer } from 'react';<\/span>\r\nimport<\/span> {<\/span> createContext<\/span>,<\/span> useContext<\/span>,<\/span> useReducer<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\n\/\/ export const TasksContext = createContext<TaskType[] | null>(null);<\/span>\r\nconst<\/span> TasksContext<\/span> =<\/span> createContext<\/span><<\/span>TaskType<\/span>[]<\/span> |<\/span> null<\/span>><\/span>(<\/span>null<\/span>);<\/span>\r\n\/\/ export const TasksDispatchContext = createContext<Dispatch<ActionType> | null>(<\/span>\r\nconst<\/span> TasksDispatchContext<\/span> =<\/span> createContext<\/span><<\/span>Dispatch<\/span><<\/span>ActionType<\/span>><\/span> |<\/span> null<\/span>><\/span>(<\/span>null<\/span>);<\/span>\r\n\r\nexport<\/span> const<\/span> useTasksContext<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n\tconst<\/span> tasks<\/span> =<\/span> useContext<\/span>(<\/span>TasksContext<\/span>);<\/span>\r\n\tconst<\/span> dispatch<\/span> =<\/span> useContext<\/span>(<\/span>TasksDispatchContext<\/span>);<\/span>\r\n\treturn<\/span> {<\/span> tasks<\/span>,<\/span> dispatch<\/span> };<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
            \u7136\u540e\uff0c\u4f7f\u7528\u72b6\u6001\uff08tasks\uff09\u548cdispatch\u7684\u7ec4\u4ef6\u53ea\u9700\u4ece\u6b64\u94a9\u5b50\u4e2d\u83b7\u53d6\uff0c\u65e0\u9700\u89e6\u53ca\u4e0a\u4e0b\u6587\u3002<\/p>\n
            \/\/ import { useContext, useState } from 'react';<\/span>\r\nimport<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\n\/\/ import { TasksDispatchContext } from '.\/TasksContext';<\/span>\r\nimport<\/span> {<\/span> useTasksContext<\/span> }<\/span> from<\/span> '<\/span>.\/TasksContext<\/span>'<\/span>;<\/span>\r\n\r\nexport<\/span> const<\/span> AddTask<\/span>:<\/span> FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n\r\n\t\/\/ const dispatch = useContext(TasksDispatchContext);<\/span>\r\n\tconst<\/span> {<\/span> dispatch<\/span> }<\/span> =<\/span> useTasksContext<\/span>();<\/span>\r\n\r\n};<\/span>\r\n<\/code><\/pre>\n
            \/\/ import { useContext, useState } from 'react';<\/span>\r\nimport<\/span> {<\/span> useState<\/span> }<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\n\r\n\/\/ import { TasksContext, TasksDispatchContext } from '.\/TasksContext';<\/span>\r\nimport<\/span> {<\/span> useTasksContext<\/span> }<\/span> from<\/span> '<\/span>.\/TasksContext<\/span>'<\/span>;<\/span>\r\n\r\nconst<\/span> Task<\/span>:<\/span> FC<\/span><<\/span>TaskProps<\/span>><\/span> =<\/span> ({<\/span> task<\/span> })<\/span> =><\/span> {<\/span>\r\n\tconst<\/span> [<\/span>isEditing<\/span>,<\/span> setIsEditing<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>false<\/span>);<\/span>\r\n\t\/\/ const dispatch = useContext(TasksDispatchContext);<\/span>\r\n\tconst<\/span> {<\/span> dispatch<\/span> }<\/span> =<\/span> useTasksContext<\/span>();<\/span>\r\n\r\n};<\/span>\r\nexport<\/span> const<\/span> TaskList<\/span>:<\/span> FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n\t\/\/ const tasks = useContext(TasksContext);<\/span>\r\n\tconst<\/span> {<\/span> tasks<\/span> }<\/span> =<\/span> useTasksContext<\/span>();<\/span>\r\n\r\n};<\/span>\r\n<\/code><\/pre>\n
            \u73b0\u5728\uff0c\u72b6\u6001\u548cdispatch\u51fd\u6570\u5df2\u7ecf\u88ab\u6dfb\u52a0\u5230\u4e86\u65b0\u7684\u81ea\u5b9a\u4e49\u94a9\u5b50(useTasksContext)\u4e2d\u8fd4\u56de\u3002\u4efb\u4f55\u5305\u542b\u5728\u4e0a\u4e0b\u6587\u63d0\u4f9b\u5668\u4e0b\u7684\u5b50\u7ec4\u4ef6\u90fd\u53ef\u4ee5\u901a\u8fc7\u94a9\u5b50\u6765\u8bfb\u53d6\u548c\u66f4\u65b0\u72b6\u6001\u3002\u5173\u4e8e\u6bcf\u4e2a\u6a21\u5757\u5177\u4f53\u7684\u4ee3\u7801\u548c\u529f\u80fd\uff0c\u8bf7\u53c2\u9605\u4e0b\u4e00\u4e2a\u793a\u4f8b004\u3002<\/p>\n
            \u6837\u4f8b004\u25a0React + TypeScript\uff1a\u4f7f\u7528Reducer\u548cContext\u8fdb\u884c\u6269\u5c5504<\/h4>\n
             <\/p>\n
            \u603b\u7ed3<\/h1>\n
            \u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5bf9\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u4e86\u89e3\u91ca\u3002<\/p>\n
              \n
            • \n
                \u30ea\u30c7\u30e5\u30fc\u30b5\u3068\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001\u30c4\u30ea\u30fc\u5185\u306e\u3069\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u3067\u3082\u4e0a\u5c64\u306e\u72b6\u614b\u304c\u53d6\u5f97\u30fb\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
                 <\/p>\n
                  \n
                • \n
                    \u72b6\u614b\u3068dispatch\u95a2\u6570\u3092\u4e0b\u5c64\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u63d0\u4f9b\u3059\u308b\u624b\u9806\u306f\u3064\u304e\u306e3\u3064\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
                    \u72b6\u614b\u3068dispatch\u95a2\u6570\u306e\u3075\u305f\u3064\u306e\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002
                    \n\u3075\u305f\u3064\u306e\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u306f\u3001\u30ea\u30c7\u30e5\u30fc\u30b5\u3092\u7528\u3044\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u63d0\u4f9b\u3057\u307e\u3059\u3002
                    \n\u305d\u308c\u3089\u306e\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u3092\u4f7f\u7528\u3059\u308b\u306e\u306f\u3001\u72b6\u614b\u306e\u53d6\u5f97\u30fb\u66f4\u65b0\u304c\u5fc5\u8981\u306a\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3059\u3002<\/p>\n
                    \u72b6\u614b\u306b\u304b\u304b\u308f\u308b\u30ed\u30b8\u30c3\u30af\u3092\u3072\u3068\u3064\u306e\u30e2\u30b8\u30e5\u30fc\u30eb\u306b\u307e\u3068\u3081\u308b\u3068\u3001\u3055\u3089\u306b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u6574\u7406\u3067\u304d\u307e\u3059\u3002<\/p>\n
                    \u30ea\u30c7\u30e5\u30fc\u30b5\u3068\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u3092\u307e\u3068\u3081\u3066\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u3057\u3066export\u3067\u304d\u308b\u306e\u304c\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u30d7\u30ed\u30d0\u30a4\u30c0(\u524d\u63b2\u30b3\u30fc\u30c9\u306eTasksProvider)\u3067\u3059\u3002
                    \n\u72b6\u614b\u3068dispatch\u95a2\u6570\u3092\u30ab\u30b9\u30bf\u30e0\u30d5\u30c3\u30af\u304b\u3089\u8fd4\u305b\u3070\u3001\u5404\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u306b\u306f\u89e6\u308c\u308b\u5fc5\u8981\u304c\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                    React\u5b98\u65b9\u7f51\u7ad9\u7684\u6587\u6863\u5df2\u4e8e2023\u5e743\u670816\u65e5\u8fdb\u884c\u4e86\u4fee\u8ba2\uff08\u8bf7\u53c2\u8003”Introducing rea […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38418","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u4f7f\u7528React\u548cTypeScript\uff1a\u901a\u8fc7Reducer\u548cContext\u6765\u63d0\u9ad8\u53ef\u6269\u5c55\u6027 - 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\/\u4f7f\u7528react\u548ctypescript\uff1a\u901a\u8fc7reducer\u548ccontext\u6765\u63d0\u9ad8\u53ef\u6269\u5c55\u6027\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4f7f\u7528React\u548cTypeScript\uff1a\u901a\u8fc7Reducer\u548cContext\u6765\u63d0\u9ad8\u53ef\u6269\u5c55\u6027\" \/>\n<meta property=\"og:description\" content=\"React\u5b98\u65b9\u7f51\u7ad9\u7684\u6587\u6863\u5df2\u4e8e2023\u5e743\u670816\u65e5\u8fdb\u884c\u4e86\u4fee\u8ba2\uff08\u8bf7\u53c2\u8003”Introducing rea […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528react\u548ctypescript\uff1a\u901a\u8fc7reducer\u548ccontext\u6765\u63d0\u9ad8\u53ef\u6269\u5c55\u6027\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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