Node.js writeStream.columns用法及代码示例

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

用法:

const writeStream.columns

返回值：此属性返回此写入Stream对象包含的列数。

范例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"); 
  
// Cathing 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

范例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

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Node.js writeStream.columns Property。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。