Node.js writeStream.moveCursor() 方法

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

句法：

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：相对于当前坐标的 y 轴坐标。
• callback：操作后执行的回调函数。

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。

示例 1：文件名：index.js

Javascript

// 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("cursor is moved :-  ",
        0, 26, 1234, "localhost");

输出：

cursor is moved :-  true

示例 2：文件名：index.js

Javascript

// 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("cursor is moved :-  " + col);

使用以下命令运行 index.js 文件：

node index.js

输出：

cursor is moved :-  true

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