Node.js writeStream.clearLine()用法及代碼示例

writeStream.clearLine()是tty模塊中WriteStream類的內置應用程序編程接口，用於清除此寫入流對象的當前行。

用法:

writeStream.clearLine(dir[, callback])

參數：此方法將以下參數作為參數：

dir:整數值，定義線的選擇。
callback:操作完成後調用。

返回值：如果寫入對象行是清除的，則此方法返回布爾值true，否則返回false。

範例1： 文件名：index.js

// Node.js program to demonstrate the 
// writeStream.clearLine() method 
  
// Importing dgram module 
var dgram = require('dgram'); 
  
// Creating and initializing client 
// and server socket 
var client = dgram.createSocket("udp4"); 
var server = dgram.createSocket("udp4"); 
  
// Handling the message event 
server.on("message", function (msg) { 
  
  // Creating and initializing a  
  // WriteStream object 
  let WriteStream = process.stdout; 
  
  // Clearing the line 
  // by using clearLine() API 
  const col = WriteStream.clearLine(); 
  
  // 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("The line is clear:-  ", 
    0, 26, 1234, "localhost");

輸出：

The line is clear:-  true

範例2： 文件名：index.js

// Node.js program to demonstrate the 
// writeStream.clearLine() method 
  
// Creating and initializing a  
// WriteStream object 
let WriteStream = process.stdout; 
  
// Clearing the line 
// by using clearLine() API 
const col = WriteStream.clearLine(); 
  
// Displaying the result 
console.log("The line is clear:-  " + col);

使用以下命令運行index.js文件：

node index.js

輸出：

The line is clear:-  true

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

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Node.js writeStream.clearLine() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。