Node.js readline：意外的令牌=> [英] Node.js readline: Unexpected token =>

问题描述

我正在学习node.js并且需要使用 readline 来创建项目。我直接从 readline模块示例中获得以下代码。

I am learning node.js and need to use readline for a project. I have the following code directly from the readline module example.

const readline = require('readline');

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

rl.question('What do you think of Node.js? ', (answer) => {
  // TODO: Log the answer in a database
  console.log('Thank you for your valuable feedback:', answer);

  rl.close();
});

但是当我通过
节点运行代码时try.js 命令，它不断发出如下错误：

But when I run the code via node try.js command, it keeps giving out the errors like below:

rl.question('What is your favorite food?', (answer) => {
                                                    ^^
SyntaxError: Unexpected token =>
    at exports.runInThisContext (vm.js:73:16)
    at Module._compile (module.js:443:25)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3

推荐答案

箭头功能， ECMAScript 6标准，仅在版本4.0.0 。

您可以升级node.js版本或使用旧语法，如下所示： / p>

You can either upgrade your node.js version or use the old syntax, which would look like this:

rl.question('What do you think of Node.js? ', function(answer) {
  // TODO: Log the answer in a database
  console.log('Thank you for your valuable feedback:', answer);

  rl.close();
});

（请注意，这些语法之间还有一个区别： this 变量的行为方式不同。这个例子无关紧要，但在其他例子中也可能。）

(Note that there is one more difference between those syntaxes: The this variable behaves differently. It doesn't matter for this example, but it may in others.)

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