javascript SyntaxError: missing ) 在参数列表之后，使用异步时
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/46306997/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
SyntaxError: missing ) after argument list, When using async
提问by Sedric Heidarizarei
Why am I getting this error When I use async?
为什么我在使用时收到此错误async？
My Code:
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);
});
Error:
错误：
bot.onText(/\/start/, async msg => {
^^^^^
SyntaxError: missing ) after argument list
I'm using node.js v6.11.0 with "dependencies":
我正在使用带有“依赖项”的 node.js v6.11.0：
{ "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" },
回答by Soviut
Your version of NodeJS (6.11 LTS) is too old and does not support the async/awaitfeatures. The syntax error is a result of the Javascript interpreter not recognizing the asynctoken and getting confused about arguments.
您的 NodeJS (6.11 LTS) 版本太旧，不支持这些async/await功能。语法错误是由于 Javascript 解释器无法识别async令牌并且对参数感到困惑。
Upgrade to NodeJS 7.6 or later. https://www.infoq.com/news/2017/02/node-76-async-await
升级到 NodeJS 7.6 或更高版本。https://www.infoq.com/news/2017/02/node-76-async-await
In prior versions, the only way to perform asynchronous behaviour is to use promises.
在以前的版本中，执行异步行为的唯一方法是使用promises。
回答by Thiago Loddi
If you don't want to/can't update your node version, try using babel presets. I had the same error using ES6 with jest (node v6.9.1).
如果您不想/无法更新您的节点版本，请尝试使用 babel 预设。我在使用 ES6 时遇到了同样的错误（节点 v6.9.1）。
Just add these two modules to your dependencies
只需将这两个模块添加到您的依赖项中
npm install --save babel-preset-es2015 babel-preset-stage-0
And add a file .babelrcto your root dir with the following code:
并.babelrc使用以下代码将文件添加到您的根目录：
{ "presets": ["es2015", "stage-0"] }
And if you are not using it already, install babel-cliand run your application with babel-nodecommand
如果您还没有使用它，请babel-cli使用babel-node命令安装并运行您的应用程序
sudo npm install -g babel-cli
babel-node app.js
