readline.createInterface(options)

• options <Object>

  • input <stream.Readable> 要监听的可读流。此选项是必需的。
  • output <stream.Writable> 将逐行读取数据写入的可写流。
  • completer <Function> 用于 Tab 自动补全的可选函数。
  • terminal <boolean> 如果 input 和 output 应该被视为 TTY，并且写入 ANSI/VT100 转义码，则为 true。 默认值: 实例化时在 output 流上检查 isTTY。
  • historySize <number> 保留的最大历史记录行数。 要禁用历史记录，请将此值设置为 0。 仅当用户或内部 output 检查将 terminal 设置为 true 时，此选项才有意义，否则根本不会初始化历史记录缓存机制。 默认值: 30。
  • prompt - 要使用的提示字符串。默认值: '> '。
  • crlfDelay <number> 如果 \r 与 \n 之间的延迟超过 crlfDelay 毫秒，则 \r 和 \n 将被视为单独的行尾输入。 crlfDelay 将被强制转换为不小于 100 的数字。 可以设置为 Infinity, 这种情况下， \r 后跟 \n 将始终被视为单个换行符（对于使用 \r\n 行分隔符的文件读取可能是合理的）。 默认值: 100。
  • removeHistoryDuplicates <boolean> 如果为 true, 则当添加到历史列表的新输入行与旧的输入行重复时，将从列表中删除旧行。 默认值: false。

readline.createInterface() 方法创建一个新的 readline.Interface 实例。

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

一旦创建了 readline.Interface 实例，最常见的用例是监听 'line' 事件：

rl.on('line', (line) => {
  console.log(`接收到：${line}`);
});

如果此实例的 terminal 为 true，则若它定义了一个 output.columns 属性则 output 流会获得最佳兼容性，并且如果或当列发生变化时， output 上会触发 'resize' 事件（当它是 TTY 时，process.stdout 会自动执行此操作）。

• options <Object>

  • input <stream.Readable> The Readable stream to listen to. This option is required.
  • output <stream.Writable> The Writable stream to write readline data to.
  • completer <Function> An optional function used for Tab autocompletion.
  • terminal <boolean> true if the input and output streams should be treated like a TTY, and have ANSI/VT100 escape codes written to it. Default: checking isTTY on the output stream upon instantiation.
  • historySize <number> Maximum number of history lines retained. To disable the history set this value to 0. This option makes sense only if terminal is set to true by the user or by an internal output check, otherwise the history caching mechanism is not initialized at all. Default: 30.
  • prompt <string> The prompt string to use. Default: '> '.
  • crlfDelay <number> If the delay between \r and \n exceeds crlfDelay milliseconds, both \r and \n will be treated as separate end-of-line input. crlfDelay will be coerced to a number no less than 100. It can be set to Infinity, in which case \r followed by \n will always be considered a single newline (which may be reasonable for reading files with \r\n line delimiter). Default: 100.
  • removeHistoryDuplicates <boolean> If true, when a new input line added to the history list duplicates an older one, this removes the older line from the list. Default: false.

The readline.createInterface() method creates a new readline.Interface instance.

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

Once the readline.Interface instance is created, the most common case is to listen for the 'line' event:

rl.on('line', (line) => {
  console.log(`Received: ${line}`);
});

If terminal is true for this instance then the output stream will get the best compatibility if it defines an output.columns property and emits a 'resize' event on the output if or when the columns ever change (process.stdout does this automatically when it is a TTY).