Node.js writeStream.isTTY 属性
writeStream.isTTY属性是 'tty' 模块中 WriteStream 类的内置应用程序编程接口,用于检查写入 Stream 对象是否为 tty 实例。对于 tty、writeStream,它将始终返回 true。
句法:
const writeStream.isTTY
返回值:如果写入 Stream 对象是 tty 的实例,则此属性返回 true。
示例 1:文件名:index.js
Javascript
// Node.js program to demonstrate the
// writeStream.isTTY 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
// WriteStream object
let WriteStream = process.stdout;
// Checking if it is instance of TTY
// or not by using isTTY() method
const status = WriteStream.isTTY;
// Displaying the result
if (status)
process.stdout.write(msg
+ "an instant of TTY" + "\n");
else
process.stdout.write(msg
+ "not an instant of TTY" + "\n");
// Exiting process
process.exit();
})
// Binding server with port
.bind(1234, () => {
});
// Client sending message to server
client.send("It is ", 0, 7, 1234, "localhost");
Javascript
// Node.js program to demonstrate the
// writeStream.isTTY() property
// Creating and initializing a
// WriteStream object
let WriteStream = process.stdout;
// Checking if it is instance of
// TTY or not by using isTTY() method
const status = WriteStream.isTTY;
// Displaying the result
if(status)
console.log("It is an instant of TTY");
else
console.log("It is not an instant of TTY");
输出:
It is an instant of TTY
示例 2:文件名:index.js
Javascript
// Node.js program to demonstrate the
// writeStream.isTTY() property
// Creating and initializing a
// WriteStream object
let WriteStream = process.stdout;
// Checking if it is instance of
// TTY or not by using isTTY() method
const status = WriteStream.isTTY;
// Displaying the result
if(status)
console.log("It is an instant of TTY");
else
console.log("It is not an instant of TTY");
输出:
It is an instant of TTY
使用以下命令运行 index.js 文件:
node index.js
参考: https://nodejs.org/dist/latest-v12.x/docs/api/tty.html#tty_writestream_istty