replServer.defineCommand(keyword, cmd)

• keyword <string> 命令关键字(没有前导 . 字符)。

  \keyword <string> The command keyword (without a leading . character).

• cmd <Object> | <Function> 当处理命令时调用的函数。

  \cmd <Object> | <Function> The function to invoke when the command is processed.

replServer.defineCommand() 方法用于向 REPL 实例添加新的以 . 为前缀的命令。此类命令是通过键入 . 后跟 keyword 来调用的。cmd 是具有以下属性的 Function 或 Object:

\The replServer.defineCommand() method is used to add new .-prefixed commands to the REPL instance. Such commands are invoked by typing a . followed by the keyword. The cmd is either a Function or an Object with the following properties:

• help <string> 当输入 .help 时显示的帮助文本(可选)。

  \help <string> Help text to be displayed when .help is entered (Optional).

• action <Function> 要执行的函数,可选择接受单个字符串参数。

  \action <Function> The function to execute, optionally accepting a single string argument.

以下示例显示了添加到 REPL 实例的两个新命令:

\The following example shows two new commands added to the REPL instance:

import repl from 'node:repl';
const replServer = repl.start({ prompt: '> ' });
replServer.defineCommand('sayhello', {
 help: 'Say hello',
 action(name) {
 this.clearBufferedCommand();
 console.log(`Hello, ${name}!`);
 this.displayPrompt();
 },
});
replServer.defineCommand('saybye', function saybye() {
 console.log('Goodbye!');
 this.close();
});const repl = require('node:repl');
const replServer = repl.start({ prompt: '> ' });
replServer.defineCommand('sayhello', {
 help: 'Say hello',
 action(name) {
 this.clearBufferedCommand();
 console.log(`Hello, ${name}!`);
 this.displayPrompt();
 },
});
replServer.defineCommand('saybye', function saybye() {
 console.log('Goodbye!');
 this.close();
});拷贝

然后可以在 REPL 实例中使用新命令:

\The new commands can then be used from within the REPL instance:

> .sayhello Node.js User
Hello, Node.js User!
> .saybye
Goodbye! 拷贝