{"id":6096,"date":"2023-01-07T10:45:13","date_gmt":"2023-01-07T02:45:13","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=6096"},"modified":"2023-01-07T10:45:13","modified_gmt":"2023-01-07T02:45:13","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8node-js%e4%b8%ad%e4%bd%bf%e7%94%a8promise%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/node-js\/%e5%a6%82%e4%bd%95%e5%9c%a8node-js%e4%b8%ad%e4%bd%bf%e7%94%a8promise%ef%bc%9f\/","title":{"rendered":"\u5982\u4f55\u5728Node.js\u4e2d\u4f7f\u7528Promise\uff1f"},"content":{"rendered":"

<\/p>\n

\u5982\u4f55\u5728 Node.js \u4e2d\u4f7f\u7528 Promise\uff1f<\/h1>\n

Promise \u662f JavaScript \u4e2d\u4e00\u7a2e\u8655\u7406\u975e\u540c\u6b65\u64cd\u4f5c\u7684\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u8b93\u4f60\u5728\u7a0b\u5f0f\u78bc\u4e2d\u66f4\u5bb9\u6613\u5730\u8655\u7406\u975e\u540c\u6b65\u64cd\u4f5c\uff0c\u800c\u4e0d\u9700\u8981\u4f7f\u7528\u56de\u8abf\u51fd\u5f0f\u3002\u5728 Node.js \u4e2d\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 Promise \u4f86\u8655\u7406\u975e\u540c\u6b65\u64cd\u4f5c\uff0c\u4e26\u4e14\u53ef\u4ee5\u66f4\u5bb9\u6613\u5730\u63a7\u5236\u7a0b\u5f0f\u7684\u6d41\u7a0b\u3002<\/p>\n

\u4f7f\u7528 Promise \u7684\u512a\u9ede<\/h2>\n

\u4f7f\u7528 Promise \u53ef\u4ee5\u8b93\u4f60\u7684\u7a0b\u5f0f\u78bc\u66f4\u5bb9\u6613\u95b1\u8b80\u548c\u7dad\u8b77\uff0c\u56e0\u70ba\u5b83\u53ef\u4ee5\u8b93\u4f60\u66f4\u5bb9\u6613\u5730\u63a7\u5236\u7a0b\u5f0f\u7684\u6d41\u7a0b\uff0c\u800c\u4e0d\u9700\u8981\u4f7f\u7528\u56de\u8abf\u51fd\u5f0f\u3002Promise \u4e5f\u53ef\u4ee5\u8b93\u4f60\u66f4\u5bb9\u6613\u5730\u63a7\u5236\u975e\u540c\u6b65\u64cd\u4f5c\uff0c\u56e0\u70ba\u5b83\u53ef\u4ee5\u8b93\u4f60\u66f4\u5bb9\u6613\u5730\u63a7\u5236\u7a0b\u5f0f\u7684\u6d41\u7a0b\uff0c\u800c\u4e0d\u9700\u8981\u4f7f\u7528\u56de\u8abf\u51fd\u5f0f\u3002<\/p>\n

\u5982\u4f55\u5728 Node.js \u4e2d\u4f7f\u7528 Promise<\/h2>\n

\u8981\u5728 Node.js \u4e2d\u4f7f\u7528 Promise\uff0c\u4f60\u9700\u8981\u5148\u5b89\u88dd promise<\/code> \u6a21\u7d44\uff0c\u53ef\u4ee5\u4f7f\u7528 npm install promise<\/code> \u4f86\u5b89\u88dd\u3002\u5b89\u88dd\u5b8c\u6210\u5f8c\uff0c\u4f60\u53ef\u4ee5\u5728\u4f60\u7684\u7a0b\u5f0f\u78bc\u4e2d\u4f7f\u7528 require('promise')<\/code> \u4f86\u5f15\u5165 Promise \u6a21\u7d44\u3002<\/p>\n

\u63a5\u4e0b\u4f86\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 Promise<\/code> \u6a21\u7d44\u4f86\u5275\u5efa\u4e00\u500b Promise \u5c0d\u8c61\uff0c\u4e26\u4e14\u628a\u4f60\u60f3\u8981\u57f7\u884c\u7684\u975e\u540c\u6b65\u64cd\u4f5c\u653e\u5230 Promise \u5c0d\u8c61\u4e2d\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 Promise<\/code> \u6a21\u7d44\u4f86\u5275\u5efa\u4e00\u500b Promise \u5c0d\u8c61\uff0c\u4e26\u4e14\u628a\u4f60\u60f3\u8981\u57f7\u884c\u7684\u975e\u540c\u6b65\u64cd\u4f5c\u653e\u5230 Promise \u5c0d\u8c61\u4e2d\uff1a<\/p>\n

\nconst myPromise = new Promise((resolve, reject) => {\n  \/\/ \u975e\u540c\u6b65\u64cd\u4f5c\n  \/\/ ...\n  if (\/* \u64cd\u4f5c\u6210\u529f *\/) {\n    resolve(\/* \u64cd\u4f5c\u7d50\u679c *\/);\n  } else {\n    reject(\/* \u932f\u8aa4\u8a0a\u606f *\/);\n  }\n});\n<\/pre>\n
\u63a5\u4e0b\u4f86\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 myPromise.then()<\/code> \u4f86\u6307\u5b9a\u7576 Promise \u5c0d\u8c61\u57f7\u884c\u6210\u529f\u6642\u8981\u57f7\u884c\u7684\u51fd\u5f0f\uff0c\u4ee5\u53ca\u4f7f\u7528 myPromise.catch()<\/code> \u4f86\u6307\u5b9a\u7576 Promise \u5c0d\u8c61\u57f7\u884c\u5931\u6557\u6642\u8981\u57f7\u884c\u7684\u51fd\u5f0f\uff1a<\/p>\n
\nmyPromise\n  .then(result => {\n    \/\/ \u64cd\u4f5c\u6210\u529f\u6642\u8981\u57f7\u884c\u7684\u51fd\u5f0f\n  })\n  .catch(error => {\n    \/\/ \u64cd\u4f5c\u5931\u6557\u6642\u8981\u57f7\u884c\u7684\u51fd\u5f0f\n  });\n<\/pre>\n
\u9019\u6a23\uff0c\u4f60\u5c31\u53ef\u4ee5\u5728 Node.js \u4e2d\u4f7f\u7528 Promise \u4f86\u8655\u7406\u975e\u540c\u6b65\u64cd\u4f5c\uff0c\u4e26\u4e14\u53ef\u4ee5\u66f4\u5bb9\u6613\u5730\u63a7\u5236\u7a0b\u5f0f\u7684\u6d41\u7a0b\u3002<\/p>\n
<\/p>\n
\u7e3d\u7d50<\/h2>\n
Promise \u662f JavaScript \u4e2d\u4e00\u7a2e\u8655\u7406\u975e\u540c\u6b65\u64cd\u4f5c\u7684\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u8b93\u4f60\u5728\u7a0b\u5f0f\u78bc\u4e2d\u66f4\u5bb9\u6613\u5730\u8655\u7406\u975e\u540c\u6b65\u64cd\u4f5c\uff0c\u800c\u4e0d\u9700\u8981\u4f7f\u7528\u56de\u8abf\u51fd\u5f0f\u3002\u5728 Node.js \u4e2d\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 Promise \u4f86\u8655\u7406\u975e\u540c\u6b65\u64cd\u4f5c\uff0c\u4e26\u4e14\u53ef\u4ee5\u66f4\u5bb9\u6613\u5730\u63a7\u5236\u7a0b\u5f0f\u7684\u6d41\u7a0b\u3002\u8981\u5728 Node.js \u4e2d\u4f7f\u7528 Promise\uff0c\u4f60\u9700\u8981\u5148\u5b89\u88dd promise<\/code> \u6a21\u7d44\uff0c\u7136\u5f8c\u4f7f\u7528 Promise<\/code> \u6a21\u7d44\u4f86\u5275\u5efa\u4e00\u500b Promise \u5c0d\u8c61\uff0c\u4e26\u4e14\u628a\u4f60\u60f3\u8981\u57f7\u884c\u7684\u975e\u540c\u6b65\u64cd\u4f5c\u653e\u5230 Promise \u5c0d\u8c61\u4e2d\uff0c\u6700\u5f8c\u4f7f\u7528 myPromise.then()<\/code> \u548c myPromise.catch()<\/code> \u4f86\u6307\u5b9a\u7576 Promise \u5c0d\u8c61\u57f7\u884c\u6210\u529f\u6216\u5931\u6557\u6642\u8981\u57f7\u884c\u7684\u51fd\u5f0f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6458\u8981\uff1aPromise\u662fNode.js\u4e2d\u4e00\u7a2e\u8655\u7406\u975e\u540c\u6b65\u64cd\u4f5c\u7684\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u5bb9\u6613\u5730\u63a7\u5236\u7a0b\u5e8f\u7684\u6d41\u7a0b\uff0c\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5982\u4f55\u5728Node.js\u4e2d\u4f7f\u7528Promise\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":[193,192],"tags":[191,190],"class_list":["post-6096","post","type-post","status-publish","format-standard","hentry","category-node","category-node-js","tag-node","tag-node-js"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-1Ak","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/6096","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=6096"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/6096\/revisions"}],"predecessor-version":[{"id":6097,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/6096\/revisions\/6097"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=6096"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=6096"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=6096"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}