{"id":2376,"date":"2020-02-01T18:35:17","date_gmt":"2020-02-01T10:35:17","guid":{"rendered":"http:\/\/www.yuguoxy.com\/geekhome\/?p=2376"},"modified":"2021-06-25T20:17:10","modified_gmt":"2021-06-25T12:17:10","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%ba%8c%ef%bc%89","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=2376","title":{"rendered":"koa2 \u4ece\u5165\u95e8\u5230\u8fdb\u9636(\u4e8c)-\u8def\u7531"},"content":{"rendered":"

\u4e4b\u524d\u7684\u6587\u7ae0\u6211\u4eec\u5df2\u7ecf\u80fd\u591f\u5728\u672c\u5730\u542f\u52a8\u4e00\u4e2a\u7b80\u5355\u7684\u9879\u76ee\uff0c\u672c\u7ae0\u6211\u4eec\u6765\u770b\u4e00\u4e0b koa \u8def\u7531\uff0cget \u4f20\u503c\uff0c\u52a8\u6001\u8def\u7531\u3002<\/p>\n

\n
\n
\n

\u4e00\u3001Koa \u8def\u7531<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\n
\n
\n
\n

\u8def\u7531(Routing)\u662f\u7531\u4e00\u4e2a URI(\u6216\u8005\u53eb\u8def\u5f84)\u548c\u4e00\u4e2a\u7279\u5b9a\u7684 HTTP \u65b9\u6cd5(GET\u3001POST \u7b49)\u7ec4\u6210\u7684\uff0c\u6d89\u53ca\u5230\u5e94\u7528\u5982\u4f55\u54cd\u5e94\u5ba2\u6237\u7aef\u5bf9\u67d0\u4e2a\u7f51\u7ad9\u8282\u70b9\u7684\u8bbf\u95ee\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\n
\n
\n
\n

\u901a\u4fd7\u7684\u8bb2:\u8def\u7531\u5c31\u662f\u6839\u636e\u4e0d\u540c\u7684 URL \u5730\u5740\uff0c\u52a0\u8f7d\u4e0d\u540c\u7684\u9875\u9762\u5b9e\u73b0\u4e0d\u540c\u7684\u529f\u80fd\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\n
\n
\n
\n

Koa \u4e2d\u7684\u8def\u7531\u548c Express \u6709\u6240\u4e0d\u540c\uff0c\u5728 Express \u4e2d\u76f4\u63a5\u5f15\u5165 Express \u5c31\u53ef\u4ee5\u914d\u7f6e\u8def\u7531\uff0c\u4f46\u662f\u5728 Koa \u4e2d\u6211\u4eec\u9700\u8981\u5b89\u88c5\u5bf9\u5e94\u7684 koa-router \u8def\u7531\u6a21\u5757\u6765\u5b9e\u73b0\u3002<\/p>\n

\n
npm install koa-router --save<\/pre>\n<\/div>\n
\u6211\u4eec\u63a5\u7740\u4e0a\u4e00\u8282\u7684\u9879\u76ee\u76ee\u5f55\u6765\u7f16\u5199\uff0c\u5c06\u6211\u4eec\u7684 app.js \u6587\u4ef6\u6539\u4e3a\u5982\u4e0b\uff1a<\/p>\n
[java]
\n\/\/\u5f15\u5165 koa\u6a21\u5757
\nvar Koa = require(‘koa’);
\nvar Router = require(‘koa-router’);<\/p>\n
\/\/\u5b9e\u4f8b\u5316
\nvar app = new Koa();
\nvar router = new Router();<\/p>\n
\/\/\u914d\u7f6e\u8def\u7531
\nrouter.get(‘\/’, async (ctx) => {
\n    \/\/ ctx  \u4e0a\u4e0b\u6587 context \uff0c\u5305\u542b\u4e86request \u548cresponse\u7b49\u4fe1\u606f
\n    \/\/ \u8fd4\u56de\u6570\u636e    \u76f8\u5f53\u4e8e\uff1a\u539f\u751f\u91cc\u9762\u7684res.writeHead()  res.end()
\n    ctx.body = ‘\u9996\u9875’;
\n});
\nrouter.get(‘\/news’, async (ctx) => {
\n    ctx.body = "\u65b0\u95fb\u9875\u9762";
\n});<\/p>\n
\/\/\u542f\u52a8\u8def\u7531
\napp.use(router.routes());
\napp.use(router.allowedMethods());
\n\/**
\n router.allowedMethods()\u4f5c\u7528\uff1a \u8fd9\u662f\u5b98\u65b9\u6587\u6863\u7684\u63a8\u8350\u7528\u6cd5,\u6211\u4eec\u53ef\u4ee5
\n \u770b\u5230 router.allowedMethods()\u7528\u5728\u4e86\u8def\u7531\u5339\u914d router.routes()\u4e4b\u540e,\u6240\u4ee5\u5728\u5f53\u6240\u6709
\n \u8def\u7531\u4e2d\u95f4\u4ef6\u6700\u540e\u8c03\u7528.\u6b64\u65f6\u6839\u636e ctx.status \u8bbe\u7f6e response \u54cd\u5e94\u5934
\n \u53ef\u4ee5\u914d\u7f6e\u4e5f\u53ef\u4ee5\u4e0d\u914d\u7f6e,\u5efa\u8bae\u914d\u7f6e\uff0c
\n *\/<\/p>\n
app.listen(3000);
\n[\/java]<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\u6211\u4eec\u5f15\u5165\u4e86 koa-router \u6a21\u5757\u6765\u914d\u7f6e\u6211\u4e48\u4eec\u7684\u8def\u7531\uff0c\u5177\u4f53\u64cd\u4f5c\u5982\u4e0a\uff0c\u6211\u4eec\u901a\u8fc7 router.get() \u7684\u65b9\u5f0f\u5b9a\u4e49\u4e86\u4e24\u4e2a\u8def\u7531\u5730\u5740 “\/” \u548c “\/news”\uff0c\u5728\u8c03\u7528\u8def\u7531\u7684\u9875\u9762\u5206\u522b\u8fd4\u56de\u4e0d\u540c\u7684\u5185\u5bb9 \uff0c\u6700\u7ec8\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
 <\/p>\n
\u5f53\u6211\u4eec\u5728\u672c\u5730\u542f\u52a8\u9879\u76ee\u540e\uff0c\u5728\u7aef\u53e3 3000 \u540e\u8f93\u5165 “\/”\uff0c\u8868\u793a\u7684\u4f9d\u65e7\u662f\u8be5\u9875\u9762\uff0c\u5f53\u6211\u4eec\u5728\u7aef\u53e3\u540e\u8f93\u5165 “\/news” \u65f6\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
 <\/p>\n
\u53ef\u4ee5\u770b\u51fa\u4e0d\u540c\u7684\u8def\u7531\u80fd\u591f\u663e\u793a\u4e0d\u540c\u7684\u5185\u5bb9\uff0c\u8bf4\u660e\u6211\u4eec\u7684\u8def\u7531\u5df2\u7ecf\u914d\u7f6e\u597d\u4e86\u3002<\/p>\n
\u4f46\u662f\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u6211\u4eec\u4f1a\u770b\u5230\u6d4f\u89c8\u5668\u7684 url \u5730\u5740\u662f\u8fd9\u6837\u7684\u00a0http:\/\/localhost:3000\/news?id=1&title=aaa<\/p>\n
\u90a3\u6211\u4eec\u5728\u540e\u53f0\u6539\u5982\u4f55\u63a5\u6536\u5230 ? \u540e\u9762\u7684\u4f20\u503c\u5462\uff0c\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n
[java]
\n\/\/\u5f15\u5165 koa\u6a21\u5757
\nvar Koa = require(‘koa’);
\nvar Router = require(‘koa-router’);<\/p>\n
\/\/\u5b9e\u4f8b\u5316
\nvar app = new Koa();
\nvar router = new Router();<\/p>\n
\/\/\u914d\u7f6e\u8def\u7531
\nrouter.get(‘\/’, async (ctx) => {
\n\/\/ ctx \u4e0a\u4e0b\u6587 context \uff0c\u5305\u542b\u4e86request \u548cresponse\u7b49\u4fe1\u606f
\n\/\/ \u8fd4\u56de\u6570\u636e \u76f8\u5f53\u4e8e\uff1a\u539f\u751f\u91cc\u9762\u7684res.writeHead() res.end()
\nctx.body = ‘\u9996\u9875’;
\n});
\nrouter.get(‘\/news’, async (ctx) => {
\n\/**
\n\u5728 koa2 \u4e2d GET \u4f20\u503c\u901a\u8fc7 request \u63a5\u6536\uff0c\u4f46\u662f\u63a5\u6536\u7684\u65b9\u6cd5\u6709\u4e24\u79cd\uff1aquery \u548c querystring\u3002
\nquery\uff1a\u8fd4\u56de\u7684\u662f\u683c\u5f0f\u5316\u597d\u7684\u53c2\u6570\u5bf9\u8c61\u3002
\nquerystring\uff1a\u8fd4\u56de\u7684\u662f\u8bf7\u6c42\u5b57\u7b26\u4e32\u3002
\n*\/<\/p>\n
\/\/\u4ecectx\u4e2d\u8bfb\u53d6get\u4f20\u503c
\nconsole.log(ctx.url); \/\/ \/news?id=1&title=aaa
\nconsole.log(ctx.query); \/\/ { id: ‘1’, title: ‘aaa’ } \u83b7\u53d6\u7684\u662f\u5bf9\u8c61 \u7528\u7684\u6700\u591a\u7684\u65b9\u5f0f ******\u63a8\u8350
\nconsole.log(ctx.querystring); \/\/ id=1&title=aaa \u83b7\u53d6\u7684\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32<\/p>\n
\/\/ctx\u91cc\u9762\u7684request\u91cc\u9762\u83b7\u53d6get\u4f20\u503c
\nconsole.log(ctx.request.url); \/\/ \/news?id=1&title=aaa
\nconsole.log(ctx.request.query); \/\/ { id: ‘1’, title: ‘aaa’ } \u5bf9\u8c61
\nconsole.log(ctx.request.querystring); \/\/ id=1&title=aaa
\nctx.body = "\u65b0\u95fb\u9875\u9762";
\n});<\/p>\n
\/\/\u542f\u52a8\u8def\u7531
\napp.use(router.routes());
\napp.use(router.allowedMethods());
\n\/**
\nrouter.allowedMethods()\u4f5c\u7528\uff1a \u8fd9\u662f\u5b98\u65b9\u6587\u6863\u7684\u63a8\u8350\u7528\u6cd5,\u6211\u4eec\u53ef\u4ee5
\n\u770b\u5230 router.allowedMethods()\u7528\u5728\u4e86\u8def\u7531\u5339\u914d router.routes()\u4e4b\u540e,\u6240\u4ee5\u5728\u5f53\u6240\u6709
\n\u8def\u7531\u4e2d\u95f4\u4ef6\u6700\u540e\u8c03\u7528.\u6b64\u65f6\u6839\u636e ctx.status \u8bbe\u7f6e response \u54cd\u5e94\u5934
\n\u53ef\u4ee5\u914d\u7f6e\u4e5f\u53ef\u4ee5\u4e0d\u914d\u7f6e,\u5efa\u8bae\u914d\u7f6e\uff0c
\n*\/<\/p>\n
app.listen(3000);[\/java]<\/p>\n
\u6211\u4eec\u5728 router.get(“\/news”, ) \u7684\u8def\u7531\u4e2d\u53ef\u4ee5\u901a\u8fc7 ctx. \u6765\u83b7\u53d6\u6211\u4eec\u60f3\u8981\u7684 get \u4f20\u503c\uff0cctx \u6253\u5370\u51fa\u6765\u4f1a\u6709\u5f88\u591a\u5185\u5bb9\uff0c\u5728\u8fd9\u91cc\u6211\u4eec\u9009\u4e86\u4e09\u4e2a\uff0c url\uff0cquery\uff0cquerystring\uff0c\u53e6\u5916\u5728 ctx.request \u4e2d\u540c\u6837\u5305\u542b\u8fd9\u4e09\u4e2a\u5185\u5bb9\uff0c\u8f93\u51fa\u7ed3\u679c\u662f\u4e00\u6837\u7684\u3002\u6211\u4eec\u5efa\u8bae get \u4f20\u503c\u7684\u65b9\u5f0f\u662f ctx.query \u7684\u5f62\u5f0f\u3002\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u7ed3\u679c\uff1a<\/p>\n
 <\/p>\n
\u6211\u4eec\u5728\u6d4f\u89c8\u5668\u4e2d\u8f93\u5165\u5982\u4e0a\u5730\u5740\uff0c\u7136\u540e\u56de\u8f66\uff0c\u6211\u4eec\u770b\u4e00\u4e0b\u7f16\u8f91\u5668\u7684\u63a7\u5236\u53f0\u8f93\u51fa\u65e5\u5fd7\uff1a<\/p>\n
 <\/p>\n
\u901a\u8fc7\u4ee5\u4e0a\u65b9\u6cd5\u6211\u4eec\u5c31\u80fd\u83b7\u53d6\u5230\u6211\u4eec\u60f3\u8981\u7684 get \u4f20\u503c\u6570\u636e\u4e86\u3002<\/p>\n
\u8fd8\u6709\u4e00\u79cd\u60c5\u51b5\u6211\u4eec\u770b\u5230\u7684\u5e76\u4e0d\u662f\u4e0a\u9762\u7684\u60c5\u51b5\uff0c\u800c\u662f\u00a0http:\/\/localhost:3000\/news\/123<\/p>\n
\u5982\u679c\u662f\u4e0a\u9762\u7684\u60c5\u51b5\uff0c\u6211\u4eec\u9700\u8981\u5728\u540e\u53f0\u8fd9\u6837\u914d\u7f6e\uff1a\u00a0router(‘\/news\/123’, async () => {})<\/span>\u00a0\uff0c\u8fd9\u6837\u663e\u7136\u662f\u53ef\u884c\u7684\uff0c\u4f46\u662f\u5982\u679c \/news\/ \u540e\u9762\u8ddf\u7684 123 \u53ef\u80fd\u662f\u522b\u7684\u5185\u5bb9\uff0c\u90a3\u6211\u4eec\u8fd8\u9700\u8981\u518d\u5199\u4e00\u4e2a\u968f\u4e4b\u5bf9\u5e94\u7684\u8def\u7531\uff0c\u8fd9\u6837\u663e\u7136\u662f\u4e0d\u53ef\u53d6\u7684\uff0c\u8fd9\u65f6\u5019\u6211\u4eec\u5c31\u9700\u8981\u5f15\u5165\u52a8\u6001\u8def\u7531\u4e86\uff0c\u5982\u4e0b\uff1a<\/p>\n
[java]
\n\/\/\u5f15\u5165 koa\u6a21\u5757
\nvar Koa = require(‘koa’);
\nvar Router = require(‘koa-router’);<\/p>\n
\/\/\u5b9e\u4f8b\u5316
\nvar app = new Koa();
\nvar router = new Router();<\/p>\n
\/\/\u914d\u7f6e\u8def\u7531
\nrouter.get(‘\/’, async (ctx) => {
\n    \/\/ ctx  \u4e0a\u4e0b\u6587 context \uff0c\u5305\u542b\u4e86request \u548cresponse\u7b49\u4fe1\u606f
\n    \/\/ \u8fd4\u56de\u6570\u636e    \u76f8\u5f53\u4e8e\uff1a\u539f\u751f\u91cc\u9762\u7684res.writeHead()  res.end()
\n    ctx.body = ‘\u9996\u9875’;
\n});
\nrouter.get(‘\/news\/:id’, async (ctx) => {
\n    \/**
\n     \u83b7\u53d6\u52a8\u6001\u8def\u7531\u4f20\u53c2
\n     *\/<\/p>\n
    \/\/\u4ecectx\u4e2d\u8bfb\u53d6get\u4f20\u503c
\n    console.log(ctx.url);   \/\/ \/news\/123
\n    console.log(ctx.params);  \/\/ { id: ‘123’ }
\n    ctx.body = "\u65b0\u95fb\u9875\u9762";
\n});<\/p>\n
\/\/\u542f\u52a8\u8def\u7531
\napp.use(router.routes());
\napp.use(router.allowedMethods());
\n\/**
\n router.allowedMethods()\u4f5c\u7528\uff1a \u8fd9\u662f\u5b98\u65b9\u6587\u6863\u7684\u63a8\u8350\u7528\u6cd5,\u6211\u4eec\u53ef\u4ee5
\n \u770b\u5230 router.allowedMethods()\u7528\u5728\u4e86\u8def\u7531\u5339\u914d router.routes()\u4e4b\u540e,\u6240\u4ee5\u5728\u5f53\u6240\u6709
\n \u8def\u7531\u4e2d\u95f4\u4ef6\u6700\u540e\u8c03\u7528.\u6b64\u65f6\u6839\u636e ctx.status \u8bbe\u7f6e response \u54cd\u5e94\u5934
\n \u53ef\u4ee5\u914d\u7f6e\u4e5f\u53ef\u4ee5\u4e0d\u914d\u7f6e,\u5efa\u8bae\u914d\u7f6e\uff0c
\n *\/<\/p>\n
app.listen(3000);
\n[\/java]<\/p>\n
\u6211\u4eec\u5c06\u4e4b\u524d\u7684 router.get(‘\/news’, ) \u6539\u4e3a router.get(‘\/news\/:id’, ) \u7684\u5f62\u5f0f\uff0c\u7136\u540e\u901a\u8fc7 ctx.params \u5c31\u80fd\u83b7\u53d6\u5230\u6211\u4eec\u60f3\u8981\u7684 get \u4f20\u53c2\uff0c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
 <\/p>\n
\u6211\u4eec\u5728\u6d4f\u89c8\u5668\u4e2d\u8f93\u5165\u5982\u4e0a\u5730\u5740\uff0c\u7136\u540e\u56de\u8f66\uff0c\u6211\u4eec\u770b\u4e00\u4e0b\u7f16\u8f91\u5668\u7684\u63a7\u5236\u53f0\u8f93\u51fa\u65e5\u5fd7\uff1a<\/p>\n
 <\/p>\n
\u901a\u8fc7\u4ee5\u4e0a\u65b9\u6cd5\u6211\u4eec\u5c31\u80fd\u83b7\u53d6\u5230\u6211\u4eec\u60f3\u8981\u7684 get \u4f20\u503c\u6570\u636e\u4e86\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\u5f15\u81ea:https:\/\/www.cnblogs.com\/weijiutao\/p\/10688892.html<\/p>\n","protected":false},"excerpt":{"rendered":"
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