{"id":1615,"date":"2021-05-10T21:12:09","date_gmt":"2021-05-10T13:12:09","guid":{"rendered":"http:\/\/149.129.74.185\/?p=1615"},"modified":"2021-05-10T21:12:09","modified_gmt":"2021-05-10T13:12:09","slug":"react-%e7%88%b6%e5%ad%90%e7%bb%84%e4%bb%b6%e5%90%8c%e6%ad%a5%e3%80%81%e5%88%b7%e6%96%b0","status":"publish","type":"post","link":"http:\/\/www.magicmipamipa.com\/?p=1615","title":{"rendered":"React : \u7236\u5b50\u7ec4\u4ef6\u540c\u6b65\u3001\u5237\u65b0"},"content":{"rendered":"

\u597d\u4e45\u6ca1\u6709\u7528\u4e2a\u4eba\u7ad9\u4e86\uff09\u521a\u624d\u4e70\u4e86\u4e2a\u65b0\u7684\u57df\u540d.xyz\uff0c\u9996\u5e74\u53ea\u89818\u5757\u94b1\uff0c\u660e\u5e74\u53ef\u4ee5\u518d\u6362\u4e00\u4e2a\uff01\uff08\u4e3a\u4ec0\u4e48\u57df\u540d\u8fde\u7eed\u5305\u5e74\u90a3\u4e48\u8d35\u554aQAQ\uff09\u56de\u6b63\u6587\u2014\u2014\u6700\u8fd1\u809d\u6bd5\u8bbe\u7684\u8fdb\u6b65\u795e\u901f\uff0c\u6bcf\u5929\u90fdGet\u4e86\u4e0d\u5c11\u77e5\u8bc6\uff0c\u6253\u7b97\u6bcf\u5929\u628a\u89e3\u51b3\u7684\u95ee\u9898\u8bb0\u5f55\u4e00\u4e0b\uff01<\/p>\n

\n

\u5207\u5165\u6b63\u9898\u3002<\/p>\n

React\u7684\u7ec4\u4ef6\u7c7b\u578b<\/h4>\n

React \u4e2d\u5305\u62ec\u4e24\u79cd\u7ec4\u4ef6\uff0c\u7c7b\u7ec4\u4ef6\u548c\u51fd\u6570\u7ec4\u4ef6\uff0c\u5f62\u5982\uff1a<\/p>\n

class child extends React.Component {\r\n    constructor(props){\r\n        super(props);\r\n        this.state = {\r\n            myIndex : 1\r\n        }\r\n    }\r\n}<\/pre>\n
import React, { useState } from \"react\";\r\nconst FCchild: React.FC = (props) =>{\r\n    const [index,setIndex] = useState(1);\r\n}<\/pre>\n
\u7ec4\u4ef6\u7684State<\/h4>\n
\u8fd9\u4e24\u79cd\u7ec4\u4ef6\u5728\u521b\u5efa\u65f6\u90fd\u6709\u00a0props<\/code> \u5c5e\u6027\uff0c\u4e0d\u540c\u662f Component \u7ec4\u4ef6\u8fd8\u9700\u8981\u4f7f\u7528 this.props<\/code> \u6765\u8bbf\u95ee\uff0c\u800c Function \u7ec4\u4ef6\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee props<\/code> \u3002Component\u51fd\u6570\u7684 State \u9700\u8981\u8c03\u7528 this.setState()<\/code> \u51fd\u6570\uff0c\u800c Function \u7ec4\u4ef6\u8c03\u7528\u8be5\u503c\u5728 useState \u65f6\u7684\u8d4b\u503c\u51fd\u6570 setIndex()<\/code>\u00a0\u76f4\u63a5\u8d4b\u503c\u3002<\/p>\n
\u8fd9\u91cc\u6709\u4e00\u4e2a\u53ef\u80fd\u9047\u5230\u7684BUG\uff0c\u5c31\u662f\u5728\u51fd\u6570\u7ec4\u4ef6\u4e2d\u7684\u7c7b\u4f3c setIndex()<\/code>\u00a0\u5bf9\u7b80\u5355\u503c\u662f\u9002\u7528\u7684\uff0c\u4f46\u662f\u5bf9\u4e8e Object \u7684\u5904\u7406\u4e0d\u50cf\u00a0this.setState()<\/code>\u00a0\u51fd\u6570\u4f1a\u81ea\u52a8\u5408\u5e76\u5bf9\u8c61\uff0c\u5982\u679c\u4f60\u53ea\u4fee\u6539\u4e86\u4e00\u4e2a\u503c\uff0c\u4f7f\u7528\u00a0{index:1}<\/code> \u7684\u5305\u88c5\u4f1a\u5c06\u5bf9\u8c61\u8bbe\u7f6e\u6210\u53ea\u6709\u8fd9\u4e00\u4e2a\u5c5e\u6027\u7684\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u4fee\u6539\u8fd9\u4e2a\u5c5e\u6027\uff08\u6709\u70b9\u50cfMongoDB\u7684\u4fee\u6539\u903b\u8f91\uff09\u3002\u56e0\u6b64\u5bf9\u4e8e\u00a0setObject()<\/code> \u53ea\u4fee\u6539\u7279\u5b9a\u5c5e\u6027\u7684\u60c5\u51b5\u53ea\u9700\u8981\u7b80\u5355\u5904\u7406\u4e3a setObject({...FormerData,...ModifyData})<\/code>\u00a0\uff0cJS\u91cc\u5f62\u5982\u8fd9\u6837\u7684\u5408\u5e76\u5bf9\u8c61\u65f6\u7684\u8bed\u6cd5\uff0c\u5904\u7406\u51b2\u7a81 key \u65f6\u540e\u9762\u7684\u5bf9\u8c61\u4f1a\u66ff\u6362\u524d\u9762\u7684\u5bf9\u8c61\u3002<\/p>\n
\u4f20\u9012\u53c2\u6570<\/h4>\n
\u4e3a\u4ec0\u4e48\u5148\u8bf4State\u8fd9\u4e2a\u4e1c\u897f\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u503c\u662f\u6bcf\u4e2a\u7ec4\u4ef6\u5185\u90e8\u7684\u4e1c\u897f\uff0c\u7ec4\u4ef6\u4e4b\u95f4\u901a\u4fe1\u5c31\u662f\u628a\u81ea\u5df1\u7684 State \u5171\u4eab\u7ed9\u53e6\u4e00\u4e2a\u7ec4\u4ef6\u7684\u60c5\u51b5\uff0c\u8fd9\u79cd\u60c5\u51b5\u5f88\u591a\u79cd\uff0c\u7236To\u5b50\u3001\u5b50To\u5b50\u3001\u5b50To\u7236\uff0c\u4f46\u662f\u5176\u6838\u5fc3\u90fd\u662f\u4f20\u9012\u8fd9\u4e2aState\u3002\u7531\u4e8e\u6bcf\u4e2a React \u7684\u7ec4\u4ef6\u6700\u540e\u90fd\u9700\u8981 return \u4e00\u4e2a HTML\uff0c\u5728\u7ec4\u4ef6\u7684 HTML \u4e2d\u589e\u52a0\u7684\u5c5e\u6027\u5c31\u4f1a\u6210\u4e3a\u7ec4\u4ef6\u7684 props\u3002React \u4e3b\u8981\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\u8fdb\u884c\u53c2\u6570\u4f20\u9012\u3002<\/p>\n
\u521a\u624d\u8bf4\u8fc7\u4e86\u4e24\u79cd\u7ec4\u4ef6\u7684state\u548csetState\u7684\u65b9\u5f0f\uff0cReact\u6839\u636e\u8fd9\u4e9b\u65b9\u6cd5\u6765\u4f20\u9012\u53c2\u6570\u3002\u5148\u8bf4\u7ed3\u8bba\uff1a<\/p>\n
    \n
  • \u5982\u679c\u5b50\u7ec4\u4ef6\u9700\u8981\u8c03\u7528\u7236\u7ec4\u4ef6\u7684\u53c2\u6570\uff0c\u5c31\u5728props\u4e0a\u52a0\u7236\u7ec4\u4ef6\u7684state\u503c\uff1b<\/li>\n
  • \u5982\u679c\u7236\u7ec4\u4ef6\u9700\u8981\u8c03\u7528\u5b50\u7ec4\u4ef6\u7684\u53c2\u6570\uff0c\u5c31\u5728props\u4e0a\u52a0\u7236\u7ec4\u4ef6\u7684setState\u65b9\u6cd5\uff0c\u7236\u7ec4\u4ef6\u6765\u8bb0\u5f55\u8fd9\u4e2a\u503c\uff1b<\/li>\n
  • \u5982\u679c\u5b50\u7ec4\u4ef6\u9700\u8981\u8c03\u7528\u5b50\u7ec4\u4ef6\u7684\u53c2\u6570\uff0c\u5c31\u5728props\u4e0a\u52a0\u7236\u7ec4\u4ef6\u7684state\u548csetState\uff0c\u7236\u7ec4\u4ef6\u6765\u8bb0\u5f55\u8fd9\u4e2a\u503c\uff1b<\/li>\n<\/ul>\n
    \u8fd9\u91cc\u4ec5\u5c40\u9650\u4e8e\u4e86\u4f20\u9012\u53c2\u6570\u7684\u95ee\u9898\uff0c\u4f46\u5176\u5b9e\u8fd9\u4e2a\u65b9\u6cd5\u662f\u5e7f\u6cdb\u7684\u3002\u8fd0\u7528\u7236\u7ec4\u4ef6\u505a\u4e2d\u4ecb\u4eba\uff0c\u6240\u6709\u6570\u636e\u90fd\u5b58\u5728\u7236\u7ec4\u4ef6\u4e0a\uff0c\u8fd9\u6837\u4e5f\u6bd4\u8f83\u65b9\u4fbf\u7ba1\u7406\uff08\u53ef\u80fd\u662f\u6211\u73b0\u5728\u7684\u62d9\u89c1QWQ\uff09 \u3002<\/p>\n
    \u4e0b\u9762\u7528\u6bd5\u8bbe\u91ccMain\u9875\u9762\u7684return\u505a\u4e2a\u4f8b\u5b50\u3002<\/p>\n
    return (\r\n        <Card>\r\n            <Layout>\r\n            <Sider width={500}>\r\n            <RenderSelecter \/>\r\n                    <Divider dashed \/>\r\n                    <SrcTable \r\n                        rowSelection={rowSelection}\r\n                        onClickJumpToVex={onClickJumpToVex}\r\n                        data={data}\r\n                        setData={setData}\r\n                        setSrc={setSrc}\r\n                        initSelectedKey={initSelectedKey}\r\n                        \/>\r\n                    <Divider dashed \/>\r\n            <\/Sider>\r\n                <Content>\r\n                    <Row>\r\n                        <Col span={20}>\r\n                        <ToolsHeader handleToolsChange={handleToolsChange}\/>\r\n                        <\/Col>\r\n                        <Col span={4}>\r\n                            <LoadAndSave \/>\r\n                        <\/Col>\r\n                    <\/Row>\r\n                    <Divider dashed \/>\r\n                    <Row>\r\n                        <Image\r\n                            selectedTool={selectedTool}\r\n                            setData={setData}\r\n                            initSelectedKey={initSelectedKey}\r\n                            src={src}\r\n                            setSrc={setSrc}\r\n                        \/>\r\n                    <\/Row>\r\n                <\/Content>\r\n            <\/Layout>\r\n            \r\n            <Row>\r\n                <TreeVisualization\r\n                    data={data}\r\n                    onClickJumpToVex={onClickJumpToVex}\r\n                    selectedMapKey={selectedMapKey}\r\n                    selectedVertexKey={selectedVertexKey}\r\n                \/>\r\n            <\/Row>\r\n\r\n        <\/Card>\r\n)<\/pre>\n
    \u6211\u628a\u6d89\u53ca\u901a\u4fe1\u7684\u65b9\u6cd5\u90fd\u653e\u5728\u4e86\u7236\u7ec4\u4ef6\uff0c\u8fd9\u6837\u80fd\u5728\u7236\u7ec4\u4ef6\u83b7\u5f97\u6240\u6709\u5b50\u7ec4\u4ef6\u7684\u4fe1\u606f\uff0c\u4e5f\u80fd\u65b9\u4fbf\u4fe1\u606f\u4e4b\u95f4\u4e92\u76f8\u540c\u6b65\u3002<\/p>\n
    \u6e32\u67d3\u66f4\u65b0<\/h4>\n
    \u6709\u4e00\u4e9b\u7ec4\u4ef6\u5728props\u5237\u65b0\u65f6\u4f1a\u81ea\u52a8\u66f4\u65b0\uff0c\u6709\u4e00\u4e9b\u5219\u9700\u8981\u624b\u52a8\u66f4\u65b0\u3002<\/p>\n
    componentDidMount()<\/span><\/code>\u00a0\u51fd\u6570\u662f\u5728 HTML \u5143\u7d20\u6302\u8f7d\u4e4b\u540e\u8c03\u7528\u7684\uff0c\u6211\u5229\u7528\u5b83\u505a\u4e86\u4e00\u4e9b d3 \u7ed8\u5236\u7684\u5de5\u4f5c\uff0c\u4f46\u662f\u6211\u8fd9\u4e2a\u7ec4\u4ef6\u662f\u81ea\u5236\u7684\uff0c\u6309\u7167 props.data \u7ed8\u5236\u51fa\u6765\u7684\u65f6\u5019\u5e76\u4e0d\u4f1a\u81ea\u52a8\u91cd\u65b0\u7ed8\u5236\u3002<\/p>\n
    \n
    componentDidUpdate<\/span>()<\/span><\/code>\u00a0\u8fd9\u4e2a\u51fd\u6570\u4e2d\uff0c\u8fd9\u4e2a\u65f6\u5019 props \u51fa\u73b0\u4e86\u53d8\u5316\uff0c\u5229\u7528\u8fd9\u4e2a\u65b9\u5f0f\u53ef\u4ee5\u8fdb\u4e00\u6b65\u5224\u65ad\u6839\u636e\u5143\u4ef6\u5185\u5b58\u4e00\u4efd state.data \uff0c\u548c\u7236\u7ec4\u4ef6\u7684 props.data \u8fdb\u884c\u5bf9\u6bd4\uff0c\u5982\u679c\u51fa\u73b0\u53d8\u5316\u5219\u6e32\u67d3\u3002\u8fd9\u6837\u4e5f\u53ef\u4ee5\u9632\u6b62\u8fc7\u5ea6\u66f4\u65b0\u3002<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
    \u597d\u4e45\u6ca1\u6709\u7528\u4e2a\u4eba\u7ad9\u4e86\uff09\u521a\u624d\u4e70\u4e86\u4e2a\u65b0\u7684\u57df\u540d.xyz\uff0c\u9996\u5e74\u53ea\u89818\u5757\u94b1\uff0c\u660e\u5e74\u53ef\u4ee5\u518d\u6362\u4e00\u4e2a\uff01\uff08\u4e3a\u4ec0\u4e48\u57df\u540d\u8fde\u7eed\u5305 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[40,16,32],"tags":[],"_links":{"self":[{"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/posts\/1615"}],"collection":[{"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1615"}],"version-history":[{"count":3,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/posts\/1615\/revisions"}],"predecessor-version":[{"id":1801,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/posts\/1615\/revisions\/1801"}],"wp:attachment":[{"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1615"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1615"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1615"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}