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npm install koa-session -S
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//或者
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yarn add koa-session

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const Koa = require('koa');
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const app = new Koa();
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const session = require('koa-session');
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const port = process.env.PORT || 3000
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app.keys = ['shinelikearainbow'];
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//session配置
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const CONFIG = {
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    key: 'koa:session',
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    maxAge: 1000*60*3,
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};
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app.listen(port, () => {
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    console.log(`服务开始在${port}端口运行`);
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});
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app.use(session(CONFIG, app));
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app.use( async ( ctx ) => {
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//添加cookie
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ctx.cookies.set(
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        'name',
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        'tom',
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        {
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            maxAge: 10 * 60 * 1000, // cookie有效时长
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            httpOnly: false,  // 是否只用于http请求中获取
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            overwrite: false,  // 是否允许重写
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            signed: true    //是否添加签名
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        }
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    )
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//添加session
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ctx.session.name="tom";
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ctx.body = "hello world";
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})