语法错误：缺少）参数列表后，使用异步时 [英] SyntaxError: missing ) after argument list, When using async

问题描述

为什么我收到此错误当我使用 async ？

Why am I getting this error When I use async?

我的代码：

bot.onText(/\/start/, async  msg => {
  const opts = {
    parse_mode: 'Markdown' ,
    reply_markup: JSON.stringify({
      keyboard: StartKeyboard,
      resize_keyboard: true,
      one_time_keyboard: true
    })
  };
  await bot.sendMessage(msg.chat.id, 'Hi', opts);
});

错误：

bot.onText(/\/start/, async  msg => {
                      ^^^^^
SyntaxError: missing ) after argument list

我正在使用带有依赖项的node.js v6.11.0：

I'm using node.js v6.11.0 with "dependencies":

{ "babel-polyfill": "^6.23.0",
  "cheerio": "^1.0.0-rc.2",
  "dotenv": "^4.0.0",
  "firebase": "^4.1.2",
  "firebase-admin": "^5.0.0",
  "node-telegram-bot-api": "^0.27.1",
  "request": "^2.81.0" },

推荐答案

您的NodeJS版本（6.11 LTS）太旧，不支持 async / await 功能。语法错误是Javascript解释器无法识别 async 令牌并对参数感到困惑的结果。

Your version of NodeJS (6.11 LTS) is too old and does not support the async/await features. The syntax error is a result of the Javascript interpreter not recognizing the async token and getting confused about arguments.

升级到NodeJS 7.6或更高版本。 https://www.infoq.com/news/2017/02 / node-76-async-await

Upgrade to NodeJS 7.6 or later. https://www.infoq.com/news/2017/02/node-76-async-await

在以前的版本中，执行异步行为的唯一方法是使用 promises 。

In prior versions, the only way to perform asynchronous behaviour is to use promises.

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