Node.js readStream.isRaw 属性

readStream.isRaw属性是 tty 模块中ReadStream类的内置应用程序编程接口，用于检查读取流对象当前是否配置为作为原始设备运行。

句法：

const status = ReadStream.isRaw;

返回值：当且仅当读取流对象当前配置为作为原始设备操作时，此属性才返回 true。

示例 1：文件名：index.js

// Node.js program to demonstrate the
// readStream.isRaw property
  
// Importing dgram module
var dgram = require('dgram');
  
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
  
// Catching the message event
server.on("message", function (msg) {
  
    // Creating and initializing a
    // ReadStream object
    let ReadStream = process.stdin;
  
    // Checking if it is configured or
    // not by using isRaw() method
    const status = ReadStream.isRaw;
  
    // Displaying the result
    if (status) {
        process.stdout.write(msg 
            + "configured" + "\n");
    } else {
        process.stdout.write(msg 
            + "not configured" + "\n");
    }
  
    // Exiting process
    process.exit();
})
  
// Binding server with port
.bind(1234, () => {
});
  
// Client sending message to server
client.send("It is ", 0, 7, 1234, "localhost");

输出：

It is not configured

示例 2：文件名：index.js

// Node.js program to demonstrate the
// readStream.isRaw property
  
// Creating and initializing a 
// ReadStream object
let ReadStream = process.stdin;
  
// Setting the read stream Raw mode
// by using setRawMode() method
ReadStream.setRawMode(true);
  
// Checking if it is configured or not 
// by using isRaw() method
const status = ReadStream.isRaw;
  
// Displaying the result
if(status) {
   console.log("It is configured");
} else {
   console.log("it is not configured");
}

使用以下命令运行 index.js 文件：

node index.js

输出：

It is configured

参考： https://nodejs.org/dist/latest-v12.x/docs/api/tty.html#tty_readstream_israw