Node.js writeStream.cursorTo() 方法

writeStream.cursorTo()方法是 tty 模块中 WriteStream 类的内置应用程序接口，用于将写入流对象的光标移动到指定位置。

句法：

writeStream.cursorTo(x[, y][, callback])

参数：此方法采用以下参数：

• x：保存光标位置的 x 轴坐标。
• y：它保存光标位置的 y 轴坐标。
• callback：操作后执行的回调函数。

返回值：如果写流对象的光标移动到指定位置，该方法返回布尔值true。

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the
// writeStream.cursorTo() 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 a specified position
  // by using cursorTo() API
  const col = WriteStream.cursorTo(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.cursorTo() method
 
// Creating and initializing a
// WriteStream object
let WriteStream = process.stdout;
 
// Moving cursor to a specified position
// by using cursorTo() API
const col = WriteStream.cursorTo(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_cursorto_x_y_callback