{"id":38645,"date":"2023-04-21T16:36:50","date_gmt":"2023-08-14T04:32:25","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8react-typescript%e5%88%9b%e5%bb%barecoil%e5%ae%98%e6%96%b9%e6%95%99%e7%a8%8b%e4%b8%ad%e7%9a%84todo%e5%88%97%e8%a1%a8-02-%e3%83%bc-%e9%80%9a%e8%bf%87%e9%80%89%e6%8b%a9%e5%99%a8%e8%bf%9b\/"},"modified":"2024-04-30T00:36:18","modified_gmt":"2024-04-29T16:36:18","slug":"%e7%94%a8react-typescript%e5%88%9b%e5%bb%barecoil%e5%ae%98%e6%96%b9%e6%95%99%e7%a8%8b%e4%b8%ad%e7%9a%84todo%e5%88%97%e8%a1%a8-02-%e3%83%bc-%e9%80%9a%e8%bf%87%e9%80%89%e6%8b%a9%e5%99%a8%e8%bf%9b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8react-typescript%e5%88%9b%e5%bb%barecoil%e5%ae%98%e6%96%b9%e6%95%99%e7%a8%8b%e4%b8%ad%e7%9a%84todo%e5%88%97%e8%a1%a8-02-%e3%83%bc-%e9%80%9a%e8%bf%87%e9%80%89%e6%8b%a9%e5%99%a8%e8%bf%9b\/","title":{"rendered":"\u7528React + TypeScript\u521b\u5efaRecoil\u5b98\u65b9\u6559\u7a0b\u4e2d\u7684Todo\u5217\u8868 02 \u30fc \u901a\u8fc7\u9009\u62e9\u5668\u8fdb\u884c\u8fc7\u6ee4\u548c\u805a\u5408\u7684\u529f\u80fd"},"content":{"rendered":"<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u300cReact + TypeScript: Recoil\u516c\u5f0f\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306eTodo\u30ea\u30b9\u30c8\u3092\u3064\u304f\u308b 01 \u30fc atom\u3092\u4f7f\u3063\u305f\u9805\u76ee\u64cd\u4f5c\u300d<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u300cReact + TypeScript: Recoil\u516c\u5f0f\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306eTodo\u30ea\u30b9\u30c8\u3092\u3064\u304f\u308b 03 \u30fc \u69cb\u6210\u3068\u30ed\u30b8\u30c3\u30af\u3092\u6574\u3048\u308b\u300d<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u300cReact + TypeScript: Recoil\u516c\u5f0f\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306eTodo\u30ea\u30b9\u30c8\u3092\u3064\u304f\u308b 04 \u30fc \u72b6\u614b\u3092\u76f4\u63a5export\u3057\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u300d<\/ul>\n<p>\u300cReact + TypeScript: Recoil\u516c\u5f0f\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306eTodo\u30ea\u30b9\u30c8\u3092\u4f5c\u308b\u300d\u7b2c2\u56de\u3067\u306f\u3001\u30bb\u30ec\u30af\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30bb\u30ec\u30af\u30bf\u306f\u3001\u8907\u6570\u306e\u30a2\u30c8\u30e0\u304b\u3089\u53c2\u7167\u3055\u308c\u308b\u5024\u3092\u5909\u66f4\u3057\u305f\u308a\u8fd4\u3057\u305f\u308a\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002\u4ed6\u306e\u30bb\u30ec\u30af\u30bf\u304b\u3089\u3082\u5024\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u7d14\u7c8b\u306a\u95a2\u6570\u3067\u3042\u308a\u3001\u6d3e\u751f\u3057\u305f\u72b6\u614b\u3092\u4f5c\u308a\u51fa\u3057\u307e\u3059\u3002\u5b8c\u6210\u3057\u305f\u30b3\u30fc\u30c9\u306f\u3001\u30b5\u30f3\u30d7\u30eb001\u3068\u3057\u3066CodeSandbox\u3067\u516c\u958b\u3057\u307e\u3057\u305f\u3002<\/p>\n<h4>React + TypeScript: Recoil\u6559\u7a0b\u793a\u4f8b02<\/h4>\n<p>&nbsp;<\/p>\n<h1>\u7b5b\u9009\u9879\u76ee<\/h1>\n<p>\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u6dfb\u52a0\u7684\u662fTodo\u9879\u76ee\u7684\u7b5b\u9009\u529f\u80fd\u3002\u6211\u4eec\u5e0c\u671b\u80fd\u591f\u5207\u6362\u5168\u4ef6\/\u5df2\u5904\u7406\/\u672a\u5904\u7406\u7684\u4e09\u79cd\u5217\u8868\u663e\u793a\u3002\u4e3a\u6b64\uff0c\u6211\u4eec\u5f15\u5165\u4e86\u65b0\u7684\u4ee3\u7801001\u4e2d\u7684\u539f\u5b50\u53d8\u91cf\uff08todoListFilterState\uff09\u3002<\/p>\n<h4>\u5177\u6709\u6240\u9009\u8fc7\u6ee4\u5668\u4f5c\u4e3a\u72b6\u6001\u7684\u539f\u5b50<\/h4>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">atom<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">recoil<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">todoListFilterState<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">atom<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">string<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">({<\/span>\r\n\t<span class=\"na\">key<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">todoListFilterState<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"na\">default<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">Show All<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">});<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4ee5\u4e0b\u7684\u4ee3\u7801002\u4e2d\uff0c\u4f20\u9012\u7ed9selector()\u7684\u53c2\u6570\u9009\u9879\u5bf9\u8c61\u7684\u5c5e\u6027get\u4e2d\u5b9a\u4e49\u7684\u56de\u8c03\u51fd\u6570\uff0c\u6839\u636e\u72b6\u6001\u7684\u503c\u8fd4\u56de\u5904\u7406\u7684\u7ed3\u679c\u3002\u7528\u4e8e\u4ece\u56de\u8c03\u51fd\u6570\u7684\u53c2\u6570\u4e2d\u63d0\u53d6get()\u6765\u5f15\u7528\u503c\u7684\u51fd\u6570\u3002\u8fd8\u8bf7\u5728\u9009\u9879\u5bf9\u8c61\u4e2d\u50cfatom\u4e00\u6837\u63d0\u4f9b\u4e00\u4e2a\u552f\u4e00\u7684\u6807\u8bc6\u7b26key\u5c5e\u6027\u3002<\/p>\n<p>\u6839\u636e\u7b5b\u9009\u5668(filteredTodoListState )\uff0cselector \u901a\u8fc7\u4f7f\u7528 Array.prototype.filter() \u65b9\u6cd5\u4ece Todo \u5217\u8868\u6570\u7ec4\u6570\u636e(todoListState) \u4e2d\u63d0\u53d6\u5e76\u8fd4\u56de\u5e94\u8be5\u663e\u793a\u7684\u9879\u76ee\uff0c\u4f9d\u8d56\u4e8e\u7b5b\u9009\u5668(atom)\u7684\u4e09\u4e2a\u503c(todoListFilterState)\uff08\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u663e\u793a\u6240\u6709\u9879\u76ee\uff09\u3002<\/p>\n<h4>\u4ee3\u7801002\u25a0\u8fc7\u6ee4\u5f85\u529e\u6e05\u5355\u7684\u9879\u76ee\u9009\u62e9\u5668<\/h4>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">selector<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">recoil<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">todoListFilterState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/todoListFilterState<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">todoListState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">..\/state\/todoListState<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">type<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">TodoItemType<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">..\/state\/todoListState<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">filteredTodoListState<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">selector<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">TodoItemType<\/span><span class=\"p\">[]<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">({<\/span>\r\n\t<span class=\"na\">key<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">filteredTodoListState<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"na\">get<\/span><span class=\"p\">:<\/span> <span class=\"p\">({<\/span> <span class=\"kd\">get<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"kd\">const<\/span> <span class=\"nx\">filter<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">get<\/span><span class=\"p\">(<\/span><span class=\"nx\">todoListFilterState<\/span><span class=\"p\">);<\/span>\r\n\t\t<span class=\"kd\">const<\/span> <span class=\"nx\">list<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">get<\/span><span class=\"p\">(<\/span><span class=\"nx\">todoListState<\/span><span class=\"p\">);<\/span>\r\n\t\t<span class=\"k\">switch <\/span><span class=\"p\">(<\/span><span class=\"nx\">filter<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t\t\t<span class=\"k\">case<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">Show Completed<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span>\r\n\t\t\t\t<span class=\"k\">return<\/span> <span class=\"nx\">list<\/span><span class=\"p\">.<\/span><span class=\"nf\">filter<\/span><span class=\"p\">((<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">isComplete<\/span><span class=\"p\">);<\/span>\r\n\t\t\t<span class=\"k\">case<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">Show Uncompleted<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span>\r\n\t\t\t\t<span class=\"k\">return<\/span> <span class=\"nx\">list<\/span><span class=\"p\">.<\/span><span class=\"nf\">filter<\/span><span class=\"p\">((<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"o\">!<\/span><span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">isComplete<\/span><span class=\"p\">);<\/span>\r\n\t\t\t<span class=\"nl\">default<\/span><span class=\"p\">:<\/span>\r\n\t\t\t\t<span class=\"k\">return<\/span> <span class=\"nx\">list<\/span><span class=\"p\">;<\/span>\r\n\t\t<span class=\"p\">}<\/span>\r\n\t<span class=\"p\">},<\/span>\r\n<span class=\"p\">});<\/span>\r\n<\/code><\/pre>\n<p>\u597d\u5566\uff0c\u7236\u7ec4\u4ef6TodoList\u8981\u5c55\u793a\u7684\u4e0d\u518d\u662f\u5168\u90e8\u7684\u6570\u636e\uff08todoListState\uff09\uff0c\u800c\u662f\u88ab\u7b5b\u9009\u8fc7\u7684\u9879\u76ee\u5217\u8868\uff08filteredTodoListState\uff09\u3002\u56e0\u6b64\uff0c\u8bf7\u5c06\u52a0\u8f7d\u72b6\u6001\u66ff\u6362\u4e3a\u4e0b\u9762\u8fd9\u6837\u3002\u6211\u5728\u8fd4\u56de\u503c\u7684JSX\u4e2d\u6dfb\u52a0\u4e86\u4e00\u4e2a\u7ec4\u4ef6\uff08TodoListFilters\uff09\uff0c\u7528\u4e8e\u5207\u6362\u663e\u793a\u9879\u76ee\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ import { todoListState } from '.\/todoListState';<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">filteredTodoListState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/filteredTodoListState<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">TodoListFilters<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/TodoListFilters<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">TodoList<\/span><span class=\"p\">:<\/span> <span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"c1\">\/\/ const todoList = useRecoilValue(todoListState);<\/span>\r\n\t<span class=\"kd\">const<\/span> <span class=\"nx\">todoList<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRecoilValue<\/span><span class=\"p\">(<\/span><span class=\"nx\">filteredTodoListState<\/span><span class=\"p\">);<\/span>\r\n\t<span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n\t\t<span class=\"p\">&lt;&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nc\">TodoListFilters<\/span> <span class=\"p\">\/&gt;<\/span>\r\n\r\n\t\t<span class=\"p\">&lt;\/&gt;<\/span>\r\n\t<span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u8868\u793a\u5207\u308a\u66ff\u3048\u7684TodoListFilters\u662f\u4e00\u4e2a\u5305\u542b\u4e09\u4e2a\u4e0b\u62c9\u9009\u9879\u7684\u7ec4\u4ef6\uff08\u4ee3\u7801003\uff09\u3002\u53ef\u4ee5\u901a\u8fc7\u9009\u62e9\u83dc\u5355\u4e2d\u7684\u503c\u6765\u8bfb\u53d6\u548c\u5199\u5165atom(todoListFilterState)\u7684\u503c\u3002\u53ef\u4ee5\u4f7f\u7528useRecoilState()\u94a9\u5b50\u6765\u8bfb\u53d6\u548c\u8bbe\u7f6e\u72b6\u6001\u3002\u8fd4\u56de\u503c\u7684\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u662f\u72b6\u6001\u503c\u7684\u5f15\u7528\uff0c\u53ef\u4ee5\u4f7f\u7528\u7b2c\u4e8c\u4e2a\u5143\u7d20\u7684\u51fd\u6570\u6765\u8fdb\u884c\u8bbe\u7f6e\u3002<\/p>\n<h4>\u5207\u6362\u4e0b\u62c9\u83dc\u5355\u7ec4\u4ef6\u7528\u4e8e\u66f4\u6539\u4ee3\u7801003\u7684\u8fc7\u6ee4\u5668\u3002<\/h4>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useCallback<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">type<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">ChangeEventHandler<\/span><span class=\"p\">,<\/span> <span class=\"nx\">FC<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useRecoilState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">recoil<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">todoListFilterState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/todoListFilterState<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">TodoListFilters<\/span><span class=\"p\">:<\/span> <span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">filter<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setFilter<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRecoilState<\/span><span class=\"p\">(<\/span><span class=\"nx\">todoListFilterState<\/span><span class=\"p\">);<\/span>\r\n\t<span class=\"kd\">const<\/span> <span class=\"na\">updateFilter<\/span><span class=\"p\">:<\/span> <span class=\"nx\">ChangeEventHandler<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">HTMLSelectElement<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useCallback<\/span><span class=\"p\">(<\/span>\r\n\t\t<span class=\"p\">({<\/span> <span class=\"na\">target<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n\t\t\t<span class=\"nf\">setFilter<\/span><span class=\"p\">(<\/span><span class=\"nx\">value<\/span><span class=\"p\">);<\/span>\r\n\t\t<span class=\"p\">},<\/span>\r\n\t\t<span class=\"p\">[<\/span><span class=\"nx\">setFilter<\/span><span class=\"p\">]<\/span>\r\n\t<span class=\"p\">);<\/span>\r\n\t<span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n\t\t<span class=\"p\">&lt;&gt;<\/span>\r\n\t\t\tFilter:\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">select<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">filter<\/span><span class=\"si\">}<\/span> <span class=\"na\">onChange<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">updateFilter<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">option<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"s\">\"Show All\"<\/span><span class=\"p\">&gt;<\/span>All<span class=\"p\">&lt;\/<\/span><span class=\"nt\">option<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">option<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"s\">\"Show Completed\"<\/span><span class=\"p\">&gt;<\/span>Completed<span class=\"p\">&lt;\/<\/span><span class=\"nt\">option<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">option<\/span> <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"s\">\"Show Uncompleted\"<\/span><span class=\"p\">&gt;<\/span>Uncompleted<span class=\"p\">&lt;\/<\/span><span class=\"nt\">option<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;\/<\/span><span class=\"nt\">select<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t<span class=\"p\">&lt;\/&gt;<\/span>\r\n\t<span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u73b0\u5728\u60a8\u53ef\u4ee5\u901a\u8fc7\u4e0b\u62c9\u83dc\u5355\u5207\u6362\u663e\u793a\u9879\u76ee\u4e3a\u5168\u90e8\/\u5df2\u5904\u7406\/\u672a\u5904\u7406\u7684\u5217\u8868\u3002<\/p>\n<p>\u524d\u6587\u4e2d\u7684`selector(filteredTodoListState)`\u4f9d\u8d56\u4e8e\u4e24\u4e2a\u539f\u5b50(`todoListFilterState`\u548c`todoListState`)\u7684\u72b6\u6001\uff0c\u5e76\u5f15\u7528\u5b83\u4eec\u7684\u503c\u3002Recoil\u662f\u4e00\u4e2a\u673a\u5236\uff0c\u5f53\u4f9d\u8d56\u7684\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u4f1a\u91cd\u65b0\u6267\u884c\u8be5\u9009\u62e9\u5668\u3002<\/p>\n<h1>\u5c06\u9879\u76ee\u7684\u60c5\u51b5\u6570\u503c\u5316\u5c55\u793a<\/h1>\n<p>\u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u5bf9Todo\u5217\u8868\u9879\u7684\u72b6\u6001\u8fdb\u884c\u91cf\u5316\u8868\u793a\u3002\u6211\u4eec\u8981\u6c42\u5f97\u7684\u662f\u603b\u6570\/\u5df2\u5904\u7406\/\u672a\u5904\u7406\u5404\u81ea\u7684\u6570\u91cf\uff0c\u4ee5\u53ca\u5904\u7406\u8fdb\u5ea6\u7684\u6bd4\u4f8b\uff08\u767e\u5206\u6bd4\uff09\u3002\u6211\u4eec\u5c06\u5728\u4e0b\u9762\u7684\u4ee3\u7801004\u4e2d\u5b9a\u4e49\u96c6\u8ba1\u7684\u9009\u62e9\u5668\u3002\u8981\u53c2\u8003\u7684\u539f\u5b50\u662ftodoListState\u4e00\u4e2a\u3002\u4ece\u5f97\u5230\u7684Todo\u5217\u8868\u6570\u7ec4\uff08todoList\uff09\u4e2d\u8ba1\u7b97\u5e76\u8fd4\u56de\u6240\u9700\u7684\u503c\u3002\u4e0e\u539f\u5b50\u57fa\u672c\u4e0a\u53ea\u6709\u4e00\u4e2a\u72b6\u6001\u503c\u76f8\u5bf9\u5e94\uff0c\u9009\u62e9\u5668\u53ef\u4ee5\u5229\u7528\u591a\u4e2a\u72b6\u6001\u6765\u8ba1\u7b97\u51fa\u591a\u4e2a\u503c\u3002<\/p>\n<h4>\u7528\u4ee3\u7801004\u25a0\u5c06\u5f85\u529e\u4e8b\u9879\u5217\u8868\u7684\u72b6\u6001\u6570\u503c\u5316\u5e76\u8fd4\u56de\u9009\u62e9\u5668\u3002<\/h4>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">selector<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">recoil<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">todoListState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/todoListState<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"nx\">type<\/span> <span class=\"nx\">TodoStatsType<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"na\">totalNum<\/span><span class=\"p\">:<\/span> <span class=\"nx\">number<\/span><span class=\"p\">;<\/span>\r\n\t<span class=\"nl\">totalCompletedNum<\/span><span class=\"p\">:<\/span> <span class=\"nx\">number<\/span><span class=\"p\">;<\/span>\r\n\t<span class=\"nl\">totalUncompletedNum<\/span><span class=\"p\">:<\/span> <span class=\"nx\">number<\/span><span class=\"p\">;<\/span>\r\n\t<span class=\"nl\">percentCompleted<\/span><span class=\"p\">:<\/span> <span class=\"nx\">number<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">};<\/span>\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">todoListStatsState<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">selector<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">TodoStatsType<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">({<\/span>\r\n\t<span class=\"na\">key<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">todoListStatsState<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"na\">get<\/span><span class=\"p\">:<\/span> <span class=\"p\">({<\/span> <span class=\"kd\">get<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"kd\">const<\/span> <span class=\"nx\">todoList<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">get<\/span><span class=\"p\">(<\/span><span class=\"nx\">todoListState<\/span><span class=\"p\">);<\/span>\r\n\t\t<span class=\"kd\">const<\/span> <span class=\"nx\">totalNum<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">todoList<\/span><span class=\"p\">.<\/span><span class=\"nx\">length<\/span><span class=\"p\">;<\/span>\r\n\t\t<span class=\"kd\">const<\/span> <span class=\"nx\">totalCompletedNum<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">todoList<\/span><span class=\"p\">.<\/span><span class=\"nf\">filter<\/span><span class=\"p\">((<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">isComplete<\/span><span class=\"p\">).<\/span><span class=\"nx\">length<\/span><span class=\"p\">;<\/span>\r\n\t\t<span class=\"kd\">const<\/span> <span class=\"nx\">totalUncompletedNum<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">totalNum<\/span> <span class=\"o\">-<\/span> <span class=\"nx\">totalCompletedNum<\/span><span class=\"p\">;<\/span>\r\n\t\t<span class=\"kd\">const<\/span> <span class=\"nx\">percentCompleted<\/span> <span class=\"o\">=<\/span>\r\n\t\t\t<span class=\"nx\">totalNum<\/span> <span class=\"o\">===<\/span> <span class=\"mi\">0<\/span> <span class=\"p\">?<\/span> <span class=\"mi\">0<\/span> <span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">totalCompletedNum<\/span> <span class=\"o\">\/<\/span> <span class=\"nx\">totalNum<\/span><span class=\"p\">)<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">100<\/span><span class=\"p\">;<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"p\">{<\/span>\r\n\t\t\t<span class=\"nx\">totalNum<\/span><span class=\"p\">,<\/span>\r\n\t\t\t<span class=\"nx\">totalCompletedNum<\/span><span class=\"p\">,<\/span>\r\n\t\t\t<span class=\"nx\">totalUncompletedNum<\/span><span class=\"p\">,<\/span>\r\n\t\t\t<span class=\"nx\">percentCompleted<\/span><span class=\"p\">,<\/span>\r\n\t\t<span class=\"p\">};<\/span>\r\n\t<span class=\"p\">},<\/span>\r\n<span class=\"p\">});<\/span>\r\n<\/code><\/pre>\n<p>\u4e0b\u9762\u7684\u4ee3\u7801005\u4e2d\u7684TodoListStats\u7ec4\u4ef6\u5c06\u7edf\u8ba1\u7ed3\u679c\u663e\u793a\u4e3a\u4e00\u4e2a\u5217\u8868\u3002\u4f7f\u7528useRecoilValue\u94a9\u5b50\u51fd\u6570\u4eceselector(todoListStatsState)\u4e2d\u83b7\u53d6\u8fd4\u56de\u503c\u3002<\/p>\n<h4>\u7f16\u7801005\u25a0\u4ee5\u5217\u8868\u5f62\u5f0f\u5c55\u793a\u805a\u5408\u7ed3\u679c\u7684\u7ec4\u4ef6<\/h4>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">type<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">FC<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useRecoilValue<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">recoil<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">todoListStatsState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/todoListStatsState<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">TodoListStats<\/span><span class=\"p\">:<\/span> <span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"kd\">const<\/span> <span class=\"p\">{<\/span>\r\n\t\t <span class=\"nx\">totalNum<\/span><span class=\"p\">,<\/span>\r\n\t\t <span class=\"nx\">totalCompletedNum<\/span><span class=\"p\">,<\/span>\r\n\t\t <span class=\"nx\">totalUncompletedNum<\/span><span class=\"p\">,<\/span>\r\n\t\t <span class=\"nx\">percentCompleted<\/span>\r\n\t<span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRecoilValue<\/span><span class=\"p\">(<\/span><span class=\"nx\">todoListStatsState<\/span><span class=\"p\">);<\/span>\r\n\t<span class=\"kd\">const<\/span> <span class=\"nx\">formattedPercentCompleted<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">Math<\/span><span class=\"p\">.<\/span><span class=\"nf\">round<\/span><span class=\"p\">(<\/span><span class=\"nx\">percentCompleted<\/span><span class=\"p\">);<\/span>\r\n\t<span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">ul<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">li<\/span><span class=\"p\">&gt;<\/span>Total items: <span class=\"si\">{<\/span><span class=\"nx\">totalNum<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">li<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">li<\/span><span class=\"p\">&gt;<\/span>Items completed: <span class=\"si\">{<\/span><span class=\"nx\">totalCompletedNum<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">li<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">li<\/span><span class=\"p\">&gt;<\/span>Items not completed: <span class=\"si\">{<\/span><span class=\"nx\">totalUncompletedNum<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">li<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">li<\/span><span class=\"p\">&gt;<\/span>Percent completed: <span class=\"si\">{<\/span><span class=\"nx\">formattedPercentCompleted<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">li<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t<span class=\"p\">&lt;\/<\/span><span class=\"nt\">ul<\/span><span class=\"p\">&gt;<\/span>\r\n\t<span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u9664\u4e86\u5207\u6362\u8fc7\u6ee4\u5668\u7684\u4e0b\u62c9\u83dc\u5355\u4e4b\u5916\uff0c\u5c06\u6c47\u603b\u5217\u8868\u7684\u7ec4\u4ef6\u63d2\u5165\u5230\u7236Todo\u5217\u8868\u4e2d\uff0c\u5c31\u53ef\u4ee5\u62e5\u6709\u4e0eRecoil\u5b98\u65b9\u6559\u7a0b\u793a\u4f8b\u76f8\u540c\u7684\u529f\u80fd\u3002\u4e0d\u8fc7\uff0c\u4e0e\u5b98\u65b9\u4ee3\u7801\u4e0d\u540c\u7684\u662f\uff0c\u6211\u4eec\u5bf9\u5176\u8fdb\u884c\u4e86\u6a21\u5757\u5316\uff0c\u5e76\u5f15\u5165\u4e86TypeScript\u7684\u7c7b\u578b\u5b9a\u4e49\uff08Code 006\uff09\u3002\u8bf7\u5728\u5f00\u5934\u63d0\u5230\u7684CodeSandbox\u793a\u4f8b001\u201cReact + TypeScript: Recoil tutorial example 02\u201d\u4e2d\u9a8c\u8bc1\u5176\u529f\u80fd\u3002<\/p>\n<h4>\u6dfb\u52a0\u4e86\u7b5b\u9009\u548c\u9879\u76ee\u6c47\u603b\u529f\u80fd\u7684Todo\u5217\u8868\u7ec4\u4ef6<\/h4>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">FC<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useRecoilValue<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">recoil<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">filteredTodoListState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/filteredTodoListState<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">TodoItem<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/TodoItem<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">TodoItemCreator<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/TodoItemCreator<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">TodoListFilters<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/TodoListFilters<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">TodoListStats<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/TodoListStats<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"kd\">const<\/span> <span class=\"nx\">TodoList<\/span><span class=\"p\">:<\/span> <span class=\"nx\">FC<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"kd\">const<\/span> <span class=\"nx\">todoList<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRecoilValue<\/span><span class=\"p\">(<\/span><span class=\"nx\">filteredTodoListState<\/span><span class=\"p\">);<\/span>\r\n\t<span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n\t\t<span class=\"p\">&lt;&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nc\">TodoListStats<\/span> <span class=\"p\">\/&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nc\">TodoListFilters<\/span> <span class=\"p\">\/&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nc\">TodoItemCreator<\/span> <span class=\"p\">\/&gt;<\/span>\r\n\t\t\t<span class=\"si\">{<\/span><span class=\"nx\">todoList<\/span><span class=\"p\">.<\/span><span class=\"nf\">map<\/span><span class=\"p\">((<\/span><span class=\"nx\">todoItem<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\r\n\t\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nc\">TodoItem<\/span> <span class=\"na\">key<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">todoItem<\/span><span class=\"p\">.<\/span><span class=\"nx\">id<\/span><span class=\"si\">}<\/span> <span class=\"na\">item<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">todoItem<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n\t\t\t<span class=\"p\">))<\/span><span class=\"si\">}<\/span>\r\n\t\t<span class=\"p\">&lt;\/&gt;<\/span>\r\n\t<span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u300cReact + TypeScript: Recoil\u516c\u5f0f\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306eTodo\u30ea\u30b9\u30c8\u3092\u3064\u304f\u308b 01 \u30fc atom\u3092\u4f7f\u3063\u305f\u9805\u76ee\u64cd\u4f5c\u300d<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u300cReact + TypeScript: Recoil\u516c\u5f0f\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306eTodo\u30ea\u30b9\u30c8\u3092\u3064\u304f\u308b 03 \u30fc \u69cb\u6210\u3068\u30ed\u30b8\u30c3\u30af\u3092\u6574\u3048\u308b\u300d<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u300cReact + TypeScript: Recoil\u516c\u5f0f\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306eTodo\u30ea\u30b9\u30c8\u3092\u3064\u304f\u308b 04 \u30fc \u72b6\u614b\u3092\u76f4\u63a5export\u3057\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u300d<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u300cReact + TypeScript: Recoil\u516c\u5f0f\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306eTodo\u30ea\u30b9\u30c8\u3092\u3064\u304f\u308b 01 \u30fc a [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38645","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u7528React + 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