{"id":6496,"date":"2023-01-08T21:19:33","date_gmt":"2023-01-08T13:19:33","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=6496"},"modified":"2023-01-08T21:19:33","modified_gmt":"2023-01-08T13:19:33","slug":"%e4%bd%bf%e7%94%a8react-js%e5%bf%ab%e9%80%9f%e6%b1%82%e5%92%8clist%e4%b8%ad%e7%9a%84%e6%95%b8%e5%80%bc","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/react-js\/%e4%bd%bf%e7%94%a8react-js%e5%bf%ab%e9%80%9f%e6%b1%82%e5%92%8clist%e4%b8%ad%e7%9a%84%e6%95%b8%e5%80%bc\/","title":{"rendered":"\u4f7f\u7528React.JS\u5feb\u901f\u6c42\u548cList\u4e2d\u7684\u6578\u503c"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"React, React List, \u6c42\u548c, sum\"><\/p>\n<h1>\u4f7f\u7528 React.JS \u5c0d React List \u6c42\u548c(sum)<\/h1>\n<p>\u5728\u958b\u767c React.JS \u61c9\u7528\u7a0b\u5f0f\u6642\uff0c\u6709\u6642\u5019\u6703\u9700\u8981\u5c0d React List \u6c42\u548c\uff0c\u4e5f\u5c31\u662f\u5c0d\u4e00\u500b\u9663\u5217\u4e2d\u7684\u6240\u6709\u5143\u7d20\u9032\u884c\u52a0\u7e3d\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528 React.JS \u4f86\u5c0d React List \u6c42\u548c\u3002<\/p>\n<p><!--more--><\/p>\n<p>React.JS \u63d0\u4f9b\u4e86\u4e00\u500b <code>reduce()<\/code> \u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u4f86\u5c0d React List \u6c42\u548c\u3002<code>reduce()<\/code> \u65b9\u6cd5\u6703\u5c0d\u9663\u5217\u4e2d\u7684\u6bcf\u500b\u5143\u7d20\u57f7\u884c\u4e00\u6b21 callback \u51fd\u5f0f\uff0c\u4e26\u5c07 callback \u51fd\u5f0f\u7684\u56de\u50b3\u503c\u7d2f\u52a0\u8d77\u4f86\uff0c\u6700\u5f8c\u56de\u50b3\u7d2f\u52a0\u7684\u7d50\u679c\u3002<\/p>\n<p>\u8209\u500b\u4f8b\u5b50\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u9663\u5217 <code>numbers<\/code>\uff0c\u88e1\u9762\u5305\u542b\u4e86\u4e00\u4e9b\u6578\u5b57\uff1a<\/p>\n<pre class=\"brush: javascript\">\nconst numbers = [1, 2, 3, 4, 5];\n<\/pre>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>reduce()<\/code> \u65b9\u6cd5\u5c0d <code>numbers<\/code> \u9032\u884c\u6c42\u548c\uff1a<\/p>\n<pre class=\"brush: javascript\">\nconst sum = numbers.reduce((acc, curr) => acc + curr, 0);\n<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5c07 <code>reduce()<\/code> \u65b9\u6cd5\u7684\u7b2c\u4e8c\u500b\u53c3\u6578\u8a2d\u5b9a\u70ba 0\uff0c\u9019\u8868\u793a\u6211\u5011\u5c07\u5f9e 0 \u958b\u59cb\u7d2f\u52a0\uff0c\u800c\u4e0d\u662f\u5f9e <code>numbers<\/code> \u4e2d\u7684\u7b2c\u4e00\u500b\u5143\u7d20\u958b\u59cb\u7d2f\u52a0\u3002<\/p>\n<p>\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c<code>acc<\/code> \u8868\u793a\u7d2f\u52a0\u5668\uff0c<code>curr<\/code> \u8868\u793a\u7576\u524d\u5143\u7d20\uff0c<code>acc + curr<\/code> \u8868\u793a\u5c07\u7576\u524d\u5143\u7d20\u52a0\u5230\u7d2f\u52a0\u5668\u4e2d\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c<code>sum<\/code> \u7684\u503c\u5c07\u6703\u662f 15\uff0c\u4e5f\u5c31\u662f <code>numbers<\/code> \u4e2d\u6240\u6709\u5143\u7d20\u7684\u7e3d\u548c\u3002<\/p>\n<p>\u7e3d\u7d50<\/p>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u4ecb\u7d39\u4e86\u5982\u4f55\u4f7f\u7528 React.JS \u4f86\u5c0d React List \u6c42\u548c\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>reduce()<\/code> \u65b9\u6cd5\u5c0d React List \u9032\u884c\u6c42\u548c\uff0c\u4e26\u5c07 callback \u51fd\u5f0f\u7684\u56de\u50b3\u503c\u7d2f\u52a0\u8d77\u4f86\uff0c\u6700\u5f8c\u56de\u50b3\u7d2f\u52a0\u7684\u7d50\u679c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6458\u8981\uff1a\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528React.JS\u5feb\u901f\u6c42\u548cList\u4e2d\u7684\u6578\u503c\uff0c\u8a73\u7d30\u4ecb\u7d39\u4e86\u5982\u4f55\u4f7f\u7528methods()\u51fd\u6578\u4f86\u9054\u5230\u6c42\u548c\u7684\u76ee\u7684\uff0c\u4e26\u63d0\u4f9b\u4e86\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\u4f86\u8a73\u7d30\u8aaa\u660e\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-6496","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\/pcFK27-1GM","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/6496","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=6496"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/6496\/revisions"}],"predecessor-version":[{"id":6497,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/6496\/revisions\/6497"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=6496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=6496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=6496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}