{"id":38414,"date":"2023-11-25T11:18:57","date_gmt":"2022-10-21T17:33:14","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e8%a7%a3%e5%86%b3react%e4%b8%adsetstate%e4%b8%8d%e7%ab%8b%e5%8d%b3%e5%8f%8d%e6%98%a0%e7%9a%84%e9%97%ae%e9%a2%98%e3%80%82\/"},"modified":"2024-01-15T09:54:55","modified_gmt":"2024-01-15T01:54:55","slug":"%e8%a7%a3%e5%86%b3react%e4%b8%adsetstate%e4%b8%8d%e7%ab%8b%e5%8d%b3%e5%8f%8d%e6%98%a0%e7%9a%84%e9%97%ae%e9%a2%98%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e8%a7%a3%e5%86%b3react%e4%b8%adsetstate%e4%b8%8d%e7%ab%8b%e5%8d%b3%e5%8f%8d%e6%98%a0%e7%9a%84%e9%97%ae%e9%a2%98%e3%80%82\/","title":{"rendered":"\u89e3\u51b3React\u4e2dsetState\u4e0d\u7acb\u5373\u53cd\u6620\u7684\u95ee\u9898"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u7531\u4e8e\u7b46\u8005\u5e73\u5e38\u4e3b\u8981\u958b\u767cBE\uff0c\u5c0d\u65bcReact\u7684\u72c0\u614b(state)\u898f\u7bc4\u4e0d\u719f\u6089\uff0c\u56e0\u6b64\u6d6a\u8cbb\u4e86\u5169\u5929\u7684\u6642\u9593\u3002<\/p>\n<p>\u6211\u5c06\u53d1\u5e03\u8fd9\u7bc7\u6587\u7ae0\u3002<\/p>\n<h1>\u603b\u7ed3\u4e00\u4e0b<\/h1>\n<p>\u5373\u4f7f\u8c03\u7528\u4e86\u4f7f\u7528useState\u5b9a\u4e49\u7684set\u51fd\u6570\uff0c\u72b6\u6001\u4e5f\u4e0d\u4f1a\u7acb\u5373\u53cd\u6620\u5230state\u4e0a\u3002<\/p>\n<p>\u66f4\u65b0\u7684\u65f6\u673a\u5728\u91cd\u65b0\u6e32\u67d3\u540e\u5f97\u5230\u53cd\u6620\u3002<\/p>\n<p>\u5982\u679c\u5728\u8c03\u7528set\u51fd\u6570\u4e4b\u540e\u7acb\u5373\u4f7f\u7528state\uff0c\u53ef\u4ee5\u4f7f\u7528useEffect\u6765\u83b7\u53d6\u503c\u3002<\/p>\n<h1>\u6211\u60f3\u505a\u7684\u4e8b\u60c5<\/h1>\n<p>\u5f53\u6807\u9898\u6240\u793a\uff0c\u5728\u72b6\u6001\u66f4\u65b0\u65f6\uff0c\u6211\u5e0c\u671b\u80fd\u591f\u4f7f\u7528\u65b0\u7684\u72b6\u6001\u5728\u53e6\u4e00\u4e2a\u51fd\u6570\u4e2d\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<p>\u6211\u6253\u7b97\u5199\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u8fd9\u4e2a\u7a0b\u5e8f\u4f1a\u5728\u8f93\u5165\u65f6\u5c06\u8f93\u5165\u5185\u5bb9\u8f93\u51fa\u5230\u63a7\u5236\u53f0\u3002<\/p>\n<h2>NG\u6a21\u5f0f<\/h2>\n<p>\u5728\u8c03\u7528set\u51fd\u6570\u540e\u76f4\u63a5\u5f15\u7528state\u7684\u6a21\u5f0f\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Sample<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/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  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">searchText<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setSearchText<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"kr\">string<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"dl\">''<\/span><span class=\"p\">)<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">handleOnChange<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"na\">e<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">ChangeEvent<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">HTMLInputElement<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setSearchText<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">searchText<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">input<\/span>\r\n        <span class=\"na\">type<\/span><span class=\"p\">=<\/span><span class=\"s\">\"text\"<\/span>\r\n        <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">searchText<\/span><span class=\"si\">}<\/span>\r\n        <span class=\"na\">onChange<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">handleOnChange<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">\/&gt;<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u8fd9\u79cd\u65b9\u5f0f\u5199\u5165\u65f6\uff0c\u5b58\u5728\u4e00\u4e2a\u95ee\u9898\uff0c\u5373\u201c\u5728\u8f93\u5165\u7684\u77ac\u95f4\u65e0\u6cd5\u8f93\u51fa\u6700\u540e\u8f93\u5165\u7684\u5b57\u7b26\u201d\u3002<\/p>\n<p>\u8fd9\u4e2a\u539f\u56e0\u662f\u56e0\u4e3a\u5728React\u4e2d\u4f7f\u7528useState\u5b9a\u4e49\u7684\u72b6\u6001\u662f\u5728\u6e32\u67d3\u4e4b\u540e\u624d\u66f4\u65b0\u503c\u7684\u89c4\u5b9a\u3002<\/p>\n<p>\u8981\u67e5\u770b\u53cd\u6620\u51fa\u6765\u7684\u72b6\u6001\uff0c\u6211\u4eec\u5e94\u8be5\u600e\u4e48\u505a\u5462\uff1f<\/p>\n<h2>\u597d\u6a21\u5f0f<\/h2>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useEffect<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Sample<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/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  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">searchText<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setSearchText<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useState<\/span><span class=\"o\">&lt;<\/span><span class=\"kr\">string<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">(<\/span><span class=\"dl\">''<\/span><span class=\"p\">)<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">handleOnChange<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"na\">e<\/span><span class=\"p\">:<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">ChangeEvent<\/span><span class=\"o\">&lt;<\/span><span class=\"nx\">HTMLInputElement<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setSearchText<\/span><span class=\"p\">(<\/span><span class=\"nx\">e<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"nx\">searchText<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">searchText<\/span><span class=\"p\">])<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">input<\/span>\r\n        <span class=\"na\">type<\/span><span class=\"p\">=<\/span><span class=\"s\">\"text\"<\/span>\r\n        <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">searchText<\/span><span class=\"si\">}<\/span>\r\n        <span class=\"na\">onChange<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">handleOnChange<\/span><span class=\"si\">}<\/span>\r\n      <span class=\"p\">\/&gt;<\/span>\r\n    <span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n  <span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u5728useEffect\u7684\u4f9d\u8d56\u6570\u7ec4\u4e2d\u6307\u5b9astate\uff0c\u7136\u540e\u5728\u6e32\u67d3\u540e\u5f15\u7528state\uff0c\u5373\u53ef\u83b7\u5f97\u66f4\u65b0\u540e\u7684\u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u7531\u4e8e\u7b46\u8005\u5e73\u5e38\u4e3b\u8981\u958b\u767cBE\uff0c\u5c0d\u65bcReact\u7684\u72c0\u614b(state)\u898f\u7bc4\u4e0d\u719f\u6089\uff0c\u56e0\u6b64\u6d6a\u8cbb\u4e86\u5169\u5929\u7684\u6642\u9593\u3002 \u6211\u5c06\u53d1\u5e03 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38414","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) - 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