{"id":2372,"date":"2020-02-01T18:30:14","date_gmt":"2020-02-01T10:30:14","guid":{"rendered":"http:\/\/www.yuguoxy.com\/geekhome\/?p=2372"},"modified":"2026-08-18T12:35:22","modified_gmt":"2026-08-18T04:35:22","slug":"koa2-%e4%bb%8e%e5%85%a5%e9%97%a8%e5%88%b0%e8%bf%9b%e9%98%b6%e4%b9%8b%e8%b7%af-%ef%bc%88%e4%b8%80%ef%bc%89","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=2372","title":{"rendered":"koa2 \u4ece\u5165\u95e8\u5230\u8fdb\u9636(\u4e00)-\u5165\u95e8"},"content":{"rendered":"
\n

Koa<\/strong> \u662f\u57fa\u4e8e Node.js \u7684\u4e0b\u4e00\u4ee3 Web \u5f00\u53d1\u6846\u67b6\uff0c\u5b98\u7f51\u7b2c\u4e00\u53e5\u5c31\u662f\u8fd9\u53e5\u8bdd\u3002\u5b98\u65b9\u7ad9\u70b9\uff1ahttps:\/\/koa.bootcss.com\/<\/a>\u3002\u5b66 Koa \u4e4b\u524d\u5e94\u5bf9 Node.js \u6709\u4e00\u5b9a\u57fa\u7840\u3002<\/p>\n

Node.js \u5b98\u65b9 API \u4ee5 callback \u5f02\u6b65\u4e3a\u4e3b\uff0c\u5bb9\u6613\u9047\u5230\u4e24\u4ef6\u4e8b\uff1a\u56de\u8c03\u5d4c\u5957<\/strong>\uff0c\u4ee5\u53ca\u5f02\u6b65\u51fd\u6570\u91cc\u540c\u6b65\u8c03\u7528 callback \u9020\u6210\u7684\u4e0d\u4e00\u81f4\u6027\u3002Koa \u5c31\u662f\u4e3a\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u51fa\u73b0\u7684\u3002<\/p>\n

Koa \u7531 Express \u539f\u73ed\u4eba\u9a6c\u6253\u9020\uff0c\u5185\u6838\u4e0d\u7ed1\u5b9a\u4e2d\u95f4\u4ef6\uff0c\u53ea\u63d0\u4f9b\u4e00\u5957\u66f4\u5c0f\u3001\u66f4\u6709\u8868\u73b0\u529b\u7684\u51fd\u6570\u5e93\u3002\u5f00\u53d1\u601d\u8def\u548c Express \u63a5\u8fd1\uff0c\u6700\u5927\u7279\u70b9\u662f\u7528 async\/await<\/code> \u907f\u5f00\u5f02\u6b65\u5d4c\u5957\uff0c\u5e76\u63d0\u5347\u9519\u8bef\u5904\u7406\u6548\u7387\u3002<\/p>\n

\u4e00\u3001\u4e3a\u4ec0\u4e48\u9700\u8981 Koa2<\/h2>\n

Koa2 \u8981\u6c42 Node.js \u7248\u672c\u9ad8\u4e8e v7.6<\/strong>\u3002\u4ece 7.6 \u8d77 Node \u624d\u5b8c\u6574\u652f\u6301 async\/await\uff0cKoa2 \u624d\u80fd\u5b8c\u6574\u4f53\u9a8c\u3002Express \u5199\u6cd5\u91cc\u5e38\u89c1 req \/ res<\/code>\uff1bKoa \u628a\u8bf7\u6c42\u548c\u54cd\u5e94\u6536\u8fdb\u4e00\u4e2a ctx<\/code>\uff08context\uff09\uff0c\u7528 ctx.body<\/code> \u5f80\u524d\u7aef\u5199\u6570\u636e\u3002<\/p>\n\n\n\n\n\n\n\n\n
\u5bf9\u6bd4\u9879<\/th>\nExpress<\/th>\nKoa2<\/th>\n<\/tr>\n<\/thead>\n
\u5f02\u6b65\u5199\u6cd5<\/td>\ncallback \/ \u4e2d\u95f4\u4ef6 next<\/td>\nasync\/await\uff0c\u907f\u514d\u5d4c\u5957<\/td>\n<\/tr>\n
\u4e0a\u4e0b\u6587<\/td>\nreq\u3001res \u5206\u5f00<\/td>\n\u7edf\u4e00\u7684 ctx<\/td>\n<\/tr>\n
\u5185\u6838<\/td>\n\u5185\u7f6e\u8f83\u591a\u80fd\u529b<\/td>\n\u4e0d\u7ed1\u5b9a\u4e2d\u95f4\u4ef6\uff0c\u6309\u9700\u5b89\u88c5<\/td>\n<\/tr>\n
\u5199\u54cd\u5e94<\/td>\nres.send("hello word")<\/td>\nctx.body = "hello word"<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e8c\u3001\u5b89\u88c5\u4e0e\u9879\u76ee\u76ee\u5f55<\/h2>\n

\u5b89\u88c5\u65b9\u5f0f\u548c\u5176\u5b83 npm \u6a21\u5757\u4e00\u6837\u3002\u52a0 --save<\/code> \u4f1a\u81ea\u52a8\u6539 package.json<\/code>\uff0c\u5199\u5165\u4f9d\u8d56\u3002<\/p>\n

npm install --save koa \/ cnpm install --save koa<\/code><\/pre>\n
\u5b9e\u6218\u6b65\u9aa4\uff1a\u5148\u5efa\u9879\u76ee\u76ee\u5f55\uff0c\u6267\u884c npm init<\/code> \u4e00\u8def\u56de\u8f66\uff0c\u5f97\u5230\u57fa\u7840 package.json<\/code>\uff1b\u518d npm install koa --save<\/code> \u5f15\u5165 Koa\uff1b\u6700\u540e\u5728\u76ee\u5f55\u91cc\u5efa app.js<\/code> \u5199\u7a0b\u5e8f\u3002\u6d41\u7a0b\u548c Express \u9879\u76ee\u7c7b\u4f3c\u3002<\/p>\n
\u6700\u7ec8\u9879\u76ee\u76ee\u5f55\u5982\u4e0b\uff1a<\/p>\n
\"1345718-20190411113808689-644683350\"<\/a><\/p>\n
\u4e09\u3001\u6700\u5c0f\u53ef\u8fd0\u884c\u793a\u4f8b<\/h2>\n
\u5728 app.js<\/code> \u91cc\u5199\u4e00\u4e2a\u6700\u7b80\u5355\u7684\u6848\u4f8b\uff1a\u5148 require("koa")<\/code>\uff0c\u518d new koa()<\/code> \u5f97\u5230\u5b9e\u4f8b\uff0c\u7136\u540e\u6302\u4e00\u4e2a\u5f02\u6b65\u4e2d\u95f4\u4ef6\uff0c\u7528 ctx.body<\/code> \u8fd4\u56de\u6570\u636e\uff0c\u6700\u540e app.listen(3000)<\/code> \u76d1\u542c\u7aef\u53e3\u3002<\/p>\n
var koa = require(\"koa\");\n\nvar app = new koa();\n\n\/\/ Express \u5199\u6cd5\n\/\/ app.use(function (req, res) {\n\/\/     res.send(\"hello word\")\n\/\/ });\n\napp.use(async (ctx) => {\n    ctx.body = \"hello word\"\n});\n\napp.listen(3000);<\/code><\/pre>\n
Koa \u8fd9\u8fb9\u7528 async (ctx) => {}<\/code> \u4e0e\u524d\u7aef\u5efa\u7acb\u8fde\u63a5\u3002\u53c2\u6570\u662f ctx<\/code>\uff0c\u4e0d\u662f Express \u7684 req\/res\u3002\u628a\u7a0b\u5e8f\u8dd1\u8d77\u6765\uff0c\u6d4f\u89c8\u5668\u8bbf\u95ee localhost:3000<\/code> \u5c31\u80fd\u770b\u5230\u8fd4\u56de\u5185\u5bb9\uff1a<\/p>\n
\"1345718-20190411120120718-1910115550\"<\/p>\n
\u8fd9\u6837\u5c31\u5b8c\u6210\u4e86\u4e00\u4e2a\u6700\u57fa\u672c\u7684 Koa \u5c0f\u6848\u4f8b\u3002\u540e\u7eed\u6587\u7ae0\u4f1a\u7ee7\u7eed\u8bb2\u8def\u7531\u3001\u4e2d\u95f4\u4ef6\u3001\u6a21\u677f\u548c\u8bf7\u6c42\u53c2\u6570\u3002<\/p>\n
\u539f\u6587\u94fe\u63a5\uff1ahttps:\/\/www.cnblogs.com\/weijiutao\/p\/10688805.html<\/a>\u3002\u53c2\u8003\uff1ahttps:\/\/www.itying.com\/koa\/article-index-id-78.html<\/a>\u3002<\/p>\n
\n
\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1aKoa2 \u7528 ctx + async\/await \u66ff\u4ee3 Express \u7684\u56de\u8c03\u5d4c\u5957\uff1bNode \u2265 7.6 \u5b89\u88c5 koa \u540e\uff0capp.use \u91cc\u5199 ctx.body \u518d listen(3000) \u5c31\u80fd\u8dd1\u8d77\u6765\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
Koa \u662f\u57fa\u4e8e Node.js \u7684\u4e0b\u4e00\u4ee3 Web \u5f00\u53d1\u6846\u67b6\uff0c\u5b98\u7f51\u7b2c\u4e00\u53e5\u5c31\u662f\u8fd9\u53e5\u8bdd\u3002\u5b98\u65b9\u7ad9\u70b9\uff1ahttps:\/\/k […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[107,105],"tags":[208],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2372"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2372"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2372\/revisions"}],"predecessor-version":[{"id":2394,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2372\/revisions\/2394"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2372"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2372"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}