现代 JavaScript 教程（The Modern JavaScript Tutorial），以最新的 ECMAScript 规范为基准，通过简单但足够详细的内容，为你讲解从基础到高阶的 JavaScript 相关知识。
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const Koa = require('koa');
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const app = new Koa();
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const bodyParser = require('koa-bodyparser');
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const getRawBody = require('raw-body')
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const Router = require('koa-router');
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let router = new Router();
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router.post('/user', async (ctx) => {
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ctx.body = {
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message: "User saved."
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};
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});
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router.post('/image', async (ctx) => {
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let body = await getRawBody(ctx.req, {
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limit: '1mb'
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});
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ctx.body = {
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message: `Image saved, size:${body.length}.`
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};
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});
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app
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.use(bodyParser())
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.use(router.routes())
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.use(router.allowedMethods());
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if (!module.parent) {
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http.createServer(app.callback()).listen(8080);
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} else {
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exports.accept = app.callback();
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}
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