Node.js writeStream.moveCursor()用法及代码示例

writeStream.moveCursor()方法是tty模块中WriteStream类的内置应用程序编程接口，用于将写入流对象的光标相对于其当前位置移动。

用法:

const writeStream.moveCursor(dx, dy[, callback])

参数：此方法采用以下参数：

dx:相对于当前坐标的x轴坐标。
dy:y轴坐标相对于当前坐标。
callback:该回调函数将在操作后执行。

返回值：如果写入流对象的光标相对于其当前位置移动，则此方法返回布尔值true。

范例1： 文件名：index.js

// Node.js program to demonstrate the 
// writeStream.moveCursor() 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; 
  
  // Moving cursor to with respect 
  // to previous position by using 
  // moveCursor() method 
  const col = WriteStream.moveCursor(10, 7, ()=>{ 
  }); 
  
  // 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("curser is moved:-  ",  
        0, 26, 1234, "localhost");

输出：


          curser is moved:-  true

范例2： 文件名：index.js

// Node.js program to demonstrate the 
// writeStream.moveCursor() method 
  
// Creating and initializing a 
// WriteStream object 
let WriteStream = process.stdout; 
  
// Moving cursor to with respect to 
// previous position by using  
// moveCursor() method 
const col = WriteStream.moveCursor(10, 7, ()=>{ 
}); 
  
// Displaying the result 
console.log("curser is moved:-  " + col);

使用以下命令运行index.js文件：

node index.js

输出：


          curser is moved:-  true

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

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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.moveCursor() Method。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。