問題描述需要輸出結(jié)果為1,2,3在輸出3之前阻塞執(zhí)行，等待2相關(guān)代碼// 請(qǐng)把代碼文本粘貼到下方（請(qǐng)勿用圖片代替代碼）const Koa = require("koa");const app = new Koa();
app.use(async (ctx, next) => { console.log(1); await next() console.log(3);
});
app.use(async (ctx, next) => {
setTimeout(() => { console.log(2);
}, 2000);
});
app.listen(3001);console.log('http://localhost:3001')你期待的結(jié)果是什么？實(shí)際看到的錯(cuò)誤信息又是什么？期望能按照1，2，3的順序輸出
1 回答
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TA貢獻(xiàn)1844條經(jīng)驗(yàn) 獲得超8個(gè)贊
const Koa = require("koa");const app = new Koa();
app.use(async (ctx, next) => { console.log(1); await next() console.log(3);
});
app.use(async (ctx, next) => { return new Promise((resolve, reject) => {
setTimeout(() => { console.log(2);
resolve();
}, 2000);
})
});
app.listen(3001);console.log('http://localhost:3001')- 1 回答
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