Node.js writeStream.columns 属性

writeStream.columns属性是 tty 模块中 WriteStream 类的内置应用程序编程接口，用于获取此写入 Stream 对象具有的列数。

句法：

const writeStream.columns

返回值：此属性返回此写入 Stream 对象包含的列数。

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the
// writeStream.columns 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;
 
    // Getting number of columns
    // by using columns API
    const col = WriteStream.columns;
 
    // Displaying the result
    process.stdout.write(msg + col);
 
    // Exiting process
    process.exit();
})
 
    // Binding server with port
    .bind(1234, () => {
    });
 
// Client sending message to server
client.send("Number of Columns :- ",
        0, 21, 1234, "localhost");

输出：

Number of Columns :- 182

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the
// writeStream.columns property
 
// Creating and initializing a WriteStream object
let WriteStream = process.stdout;
 
// Getting number of columns
// by using columns API
const col = WriteStream.columns;
 
// Displaying the result
console.log("Number of Columns :- " + col);

输出：

Number of Columns :- 182

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_columns