（節點：52585）UnhandledPromiseRejectionWarning：未處理的 promise 拒絕

Question

我有一個 function ，我使用導入的 npm package current-weather 根據該位置的經度和緯度獲取某個位置的天氣。 我以前從未使用過 Promise，因為我通常使用 await 和 async，但這似乎很有趣且值得學習......當運行下面的這段代碼時，它不會呈現頁面並給我錯誤(node:52585) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with.catch(). To terminate the node process on unhandled promise rejection, use the CLI flag (node:52585) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with.catch(). To terminate the node process on unhandled promise rejection, use the CLI flag (node:52585) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with.catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2) (node:52585) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code. (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2) (node:52585) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

這是我的代碼：

 app.get('/admin-dashboard', (req, res) => {
    if (req.session.loggedin) {

     
      
        const location = {
            lat: 43.955540,
            lon: -79.480950
        }
         
    

        getWeather(location)
            .then(weather => {
                console.log(`The temperature here is: ${weather.temperature.value}`)
               
         
          
        res.render("admin-dashboard", {
            page_title: "admin-dashboard",
            FN: req.session.firstname,
            LN: req.session.lastname,
            weather: ${weather.temperature.value},
          });
        }).catch(err => console.log(err));
    } else {
        res.render('login.ejs')
    }
})

Answer 1

您沒有getWeather function 引發的錯誤。 您可以將.catch添加到 function，例如

app.get('/admin-dashboard', (req, res) => {
    if (req.session.loggedin) {
      const location = {
            lat: 43.955540,
            lon: -79.480950
        }
      getWeather(location).then(weather => {
        console.log(`The temperature here is: ${weather.temperature.value}`);
        res.render('admin-dashboard', {
          page_title: "admin-dashboard",
          FN: req.session.firstname,
          LN: req.session.lastname,
          weather: weather.temperature.value,
        }).catch(err => console.log(err));
      })
    } else {
      res.render('login.ejs')
    }
})

或者如果你更舒服，你可以使用 async/await

try {
    const weather = await getWeather(location);
    console.log(`The temperature here is ${weather.temperature.value}`);

    res.render("admin-dashboard", {
        page_title: "admin-dashboard",
        FN: req.session.firstname,
        LN: req.session.lastname,
        weather: weather.temperature.value,
    });
} catch(err) {
    console.log(err);
}

請注意，我只記錄錯誤，您可以根據需要處理它們。