問題描述

我的代碼的 let 部分產(chǎn)生了一個錯誤，我通過將 client.login 移動到底部來弄清楚為什么機(jī)器人無法啟動新錯誤包括它只是發(fā)送垃圾郵件無效的郵政編碼.請遵循以下格式:_weather <#####>" 即使你輸入郵政編碼

The let part of my code is producing an error I figured out why the bot wouldn't start by moving the client.login to the bottom new error includes it just spamming "Invalid Zip Code. Please follow the format: _weather <#####>" even if you put in the zipcode

client.on("message", (message) => {
    if (message.content.includes("_weather") && message.author.bot === false)
        let zipCode = message.content.split(" ")[1];
    if (zipCode === undefined || zipCode.length != 5 || parseInt(zipCode) === NaN) {
        message.channel.send("`Invalid Zip Code. Please follow the format: _weather <#####>`")
            .catch(console.error);
        return;
    } else {
        fetch(`https://openweathermap.org/data/2.5/weather?zip=${zipCode},us&appid=439d4b804bc8187953eb36d2a8c26a02`)
            .then(response => {
                return response.json();
            })
            .then(parsedWeather => {
                if (parsedWeather.cod === '404') {
                    message.channel.send("`This zip code does not exist or there is no information avaliable.`");
                } else {
                    message.channel.send(`

        The Current Weather
        Location: ${parsedWeather.name}, ${parsedWeather.sys.country}
        Forecast: ${parsedWeather.weather[0].main}
        Current Temperature: ${(Math.round(((parsedWeather.main.temp - 273.15) * 9 / 5 + 32)))}° F
        High Temperature: ${(Math.round(((parsedWeather.main.temp_max - 273.15) * 9 / 5 + 32)))}° F
        Low Temperature: ${(Math.round(((parsedWeather.main.temp_min - 273.15) * 9 / 5 + 32)))}° F
        `);

                }
            });
    }
});
client.login('token');

推薦答案

你不能在像 if 這樣的語句之后使用詞法聲明(const 和 let)、else、for 等沒有塊 ({}).改用這個:

You can't use lexical declarations (const and let) after statements like if, else, for etc. without a block ({}). Use this instead:

client.on("message", (message) => {
    // declares the zipCode up here first
    let zipCode
    if (message.content.includes("_weather") && message.author.bot === false)
        zipCode = message.content.split(" ")[1];
    // rest of code
});

<小時>

編輯第二個問題

您需要檢查郵件是否由機(jī)器人發(fā)送，以便它忽略他們發(fā)送的所有郵件，包括無效郵政編碼"郵件:

Edit for 2nd question

You need to check if the message was sent by a bot so that it will ignore all messages sent by them, including the 'Invalid Zip Code' message:

client.on("message", (message) => {
    if (!message.author.bot) return;
    // rest of code
});

否則，無效郵政編碼"消息將觸發(fā)機(jī)器人發(fā)送另一個無效郵政編碼"消息，因?yàn)闊o效郵政編碼"顯然不是有效的郵政編碼.

Without that, the 'Invalid Zip Code' message would trigger the bot to send another 'Invalid Zip Code' message as 'Invalid Zip Code' is obviously not a valid zip code.

另外，將 parseInt(zipCode) === NaN 更改為 Number.isNaN(parseInt(zipCode)).NaN === NaN 在 JS 中由于某種原因是 false，所以你需要使用 Number.isNaN.你也可以只做 isNaN(zipCode) 因?yàn)?isNaN 將其輸入強(qiáng)制轉(zhuǎn)換為一個數(shù)字，然后檢查它是否為 NaN.

Also, change parseInt(zipCode) === NaN to Number.isNaN(parseInt(zipCode)). NaN === NaN is false for some reason in JS, so you need to use Number.isNaN. You could also just do isNaN(zipCode) because isNaN coerces its input to a number and then checks if it's NaN.

console.log(`0 === NaN: ${0 === NaN}`)
console.log(`'abc' === NaN: ${'abc' === NaN}`)
console.log(`NaN === NaN: ${NaN === NaN}`)
console.log('')
console.log(`isNaN(0): ${isNaN(0)}`)
console.log(`isNaN('abc'): ${isNaN('abc')}`)
console.log(`isNaN(NaN): ${isNaN(NaN)}`)
console.log('')
console.log(`Number.isNaN(0): ${Number.isNaN(0)}`)
console.log(`Number.isNaN('abc'): ${Number.isNaN('abc')}`)
console.log(`Number.isNaN(NaN): ${Number.isNaN(NaN)}`)

試試這個代碼:

client.on("message", (message) => {
  if (message.content.includes("_weather") && !message.author.bot) {
    let zipCode = message.content.split(" ")[1];
    if (zipCode === undefined || zipCode.length != 5 || Number.isNaN(parseInt(zipCode))) {
      message.channel.send("`Invalid Zip Code. Please follow the format: _weather <#####>`")
        .catch(console.error);
      return;
    } else {
      fetch(`https://openweathermap.org/data/2.5/weather?zip=${zipCode},us&appid=439d4b804bc8187953eb36d2a8c26a02`)
        .then(response => {
          return response.json();
        })
        .then(parsedWeather => {
          if (parsedWeather.cod === '404') {
            message.channel.send("`This zip code does not exist or there is no information avaliable.`");
          } else {
            message.channel.send(`

        The Current Weather
        Location: ${parsedWeather.name}, ${parsedWeather.sys.country}
        Forecast: ${parsedWeather.weather[0].main}
        Current Temperature: ${(Math.round(((parsedWeather.main.temp - 273.15) * 9 / 5 + 32)))}° F
        High Temperature: ${(Math.round(((parsedWeather.main.temp_max - 273.15) * 9 / 5 + 32)))}° F
        Low Temperature: ${(Math.round(((parsedWeather.main.temp_min - 273.15) * 9 / 5 + 32)))}° F
        `);

          }
        });
    }
  }
})

<小時>

編輯 3

if (message.content.startsWith("_weather") && !message.author.bot)

這篇關(guān)于獲取 SyntaxError:詞法聲明不能出現(xiàn)在單語句上下文中的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！