{"id":5721,"date":"2023-01-06T14:47:05","date_gmt":"2023-01-06T06:47:05","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=5721"},"modified":"2023-01-06T14:47:05","modified_gmt":"2023-01-06T06:47:05","slug":"%e4%bd%bf%e7%94%a8react-js%e6%b1%82%e5%8f%96%e5%8d%94%e6%96%b9%e5%b7%ae","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/react-js\/%e4%bd%bf%e7%94%a8react-js%e6%b1%82%e5%8f%96%e5%8d%94%e6%96%b9%e5%b7%ae\/","title":{"rendered":"\u4f7f\u7528React.JS\u6c42\u53d6\u5354\u65b9\u5dee"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"React, List, Covariance\"><\/p>\n<h1>\u4f7f\u7528 React.JS \u6c42\u534f\u65b9\u5dee(covariance)<\/h1>\n<p>\u534f\u65b9\u5dee(covariance)\u662f\u4e00\u7a2e\u7d71\u8a08\u6280\u8853\uff0c\u7528\u65bc\u8861\u91cf\u5169\u500b\u8b8a\u91cf\u4e4b\u9593\u7684\u7dda\u6027\u95dc\u4fc2\u3002\u5b83\u53ef\u4ee5\u7528\u4f86\u6e2c\u91cf\u5169\u500b\u8b8a\u91cf\u4e4b\u9593\u7684\u76f8\u95dc\u6027\uff0c\u4e26\u4e14\u53ef\u4ee5\u7528\u4f86\u9810\u6e2c\u5169\u500b\u8b8a\u91cf\u4e4b\u9593\u7684\u8b8a\u5316\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528 React.JS \u4f86\u6c42\u53d6\u5354\u65b9\u5dee\u3002<\/p>\n<h2>\u4f7f\u7528 React.JS \u6c42\u53d6\u5354\u65b9\u5dee<\/h2>\n<p>React.JS \u662f\u4e00\u500b JavaScript \u6846\u67b6\uff0c\u53ef\u4ee5\u7528\u65bc\u958b\u767c\u9ad8\u6027\u80fd\u7684 Web \u548c\u79fb\u52d5\u61c9\u7528\u7a0b\u5e8f\u3002\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u5feb\u901f\u958b\u767c\u548c\u90e8\u7f72\u61c9\u7528\u7a0b\u5e8f\uff0c\u4e26\u4e14\u53ef\u4ee5\u63d0\u4f9b\u9ad8\u6027\u80fd\u7684\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n<p>React.JS \u63d0\u4f9b\u4e86\u4e00\u500b List \u7d44\u4ef6\uff0c\u53ef\u4ee5\u7528\u65bc\u6c42\u53d6\u5354\u65b9\u5dee\u3002 List \u7d44\u4ef6\u53ef\u4ee5\u63a5\u53d7\u4e00\u500b\u6578\u7d44\uff0c\u4e26\u5c07\u5176\u8f49\u63db\u70ba\u4e00\u500b React \u5143\u7d20\u7684\u5217\u8868\u3002 List \u7d44\u4ef6\u53ef\u4ee5\u63a5\u53d7\u4e00\u500b\u51fd\u6578\uff0c\u8a72\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u8a08\u7b97\u5354\u65b9\u5dee\u3002<\/p>\n<pre class=\"brush: javascript\">\nimport React from 'react';\nimport { List } from 'react-list';\n\nconst data = [1, 2, 3, 4, 5];\n\nconst covariance = (data) => {\n  let sumX = 0;\n  let sumY = 0;\n  let sumXY = 0;\n  let n = data.length;\n\n  for (let i = 0; i < n; i++) {\n    sumX += data[i][0];\n    sumY += data[i][1];\n    sumXY += data[i][0] * data[i][1];\n  }\n\n  return (sumXY - (sumX * sumY) \/ n) \/ (n - 1);\n};\n\nconst CovarianceList = () => (\n  <List\n    data={data}\n    renderItem={(item, index) => (\n      <div>\n        {`Covariance of <span class=\"katex math inline\">{item[0]} and<\/span>{item[1]}: ${covariance(item)}`}\n      <\/div>\n    )}\n  \/>\n);\n\nexport default CovarianceList;\n<\/pre>\n<p>\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4f7f\u7528 List \u7d44\u4ef6\u5c07\u6578\u7d44\u8f49\u63db\u70ba React \u5143\u7d20\u7684\u5217\u8868\uff0c\u4e26\u5c07\u5176\u50b3\u905e\u7d66 covariance \u51fd\u6578\uff0c\u4ee5\u6c42\u53d6\u5354\u65b9\u5dee\u3002<\/p>\n<p>List \u7d44\u4ef6\u53ef\u4ee5\u63a5\u53d7\u4e00\u500b\u51fd\u6578\uff0c\u8a72\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u6e32\u67d3\u6bcf\u500b\u5143\u7d20\u7684 React \u5143\u7d20\u3002\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5c07 covariance \u51fd\u6578\u50b3\u905e\u7d66 List \u7d44\u4ef6\uff0c\u4ee5\u6c42\u53d6\u6bcf\u500b\u5143\u7d20\u7684\u5354\u65b9\u5dee\u3002<\/p>\n<p>\u7d93\u904e\u4e0a\u8ff0\u6b65\u9a5f\uff0c\u6211\u5011\u5c31\u53ef\u4ee5\u4f7f\u7528 React.JS \u4f86\u6c42\u53d6\u5354\u65b9\u5dee\u4e86\u3002\u9019\u500b\u6280\u8853\u53ef\u4ee5\u7528\u65bc\u6e2c\u91cf\u5169\u500b\u8b8a\u91cf\u4e4b\u9593\u7684\u76f8\u95dc\u6027\uff0c\u4e26\u4e14\u53ef\u4ee5\u7528\u4f86\u9810\u6e2c\u5169\u500b\u8b8a\u91cf\u4e4b\u9593\u7684\u8b8a\u5316\u3002<\/p>\n<p><!--more--><\/p>\n<h2>\u7e3d\u7d50<\/h2>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u4ecb\u7d39\u4e86\u5982\u4f55\u4f7f\u7528 React.JS \u4f86\u6c42\u53d6\u5354\u65b9\u5dee\u3002\u6211\u5011\u4f7f\u7528 List \u7d44\u4ef6\u5c07\u6578\u7d44\u8f49\u63db\u70ba React \u5143\u7d20\u7684\u5217\u8868\uff0c\u4e26\u5c07\u5176\u50b3\u905e\u7d66 covariance \u51fd\u6578\uff0c\u4ee5\u6c42\u53d6\u5354\u65b9\u5dee\u3002\u9019\u500b\u6280\u8853\u53ef\u4ee5\u7528\u65bc\u6e2c\u91cf\u5169\u500b\u8b8a\u91cf\u4e4b\u9593\u7684\u76f8\u95dc\u6027\uff0c\u4e26\u4e14\u53ef\u4ee5\u7528\u4f86\u9810\u6e2c\u5169\u500b\u8b8a\u91cf\u4e4b\u9593\u7684\u8b8a\u5316\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6458\u8981\uff1a\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528React.JS\u6c42\u53d6\u5354\u65b9\u5dee\uff0c\u4e26\u8a73\u7d30\u8aaa\u660e\u5354\u65b9\u5dee\u7684\u6982\u5ff5\u53ca\u5176\u5728\u6578\u64da\u5206\u6790\u4e2d\u7684\u61c9\u7528\u3002\u6b64\u5916\uff0c\u9084\u5c07\u63d0\u4f9b\u4e00\u4e9b\u7c21\u55ae\u7684\u793a\u4f8b\u4f86\u89e3\u91cb\u5982\u4f55\u4f7f\u7528React.JS\u6c42\u53d6\u5354\u65b9\u5dee\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[184,183],"tags":[182,181],"class_list":["post-5721","post","type-post","status-publish","format-standard","hentry","category-react","category-react-js","tag-react","tag-react-js"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-1uh","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5721","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=5721"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5721\/revisions"}],"predecessor-version":[{"id":5722,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5721\/revisions\/5722"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=5721"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=5721"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=5721"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}