Node.jsBuffer.writeUInt32LE()方法

原文:https://www . geesforgeks . org/node-js-buffer-writeuint 32 le-method/

Buffer.writeUInt32LE()方法用于使用小端格式将指定的字节写入缓冲对象。该值包含有效的未赋值 32 位整数。

语法:

Buffer.writeUInt32LE( value, offset )


参数:该方法接受两个参数，如上所述，如下所述:

• Value: It is an integer value to be written into the buffer.


• Offset: is an integer value, indicating the number of bytes to skip before writing, and the offset value is in the range of 0 to buffer.length–4 . Its default value is 0.

返回值:返回偏移量加上写入字节数的整数值。

例 1:

// Node.js program to demonstrate the  
// Buffer.writeUInt32LE() Method
// Allocate a buffer
const buf = Buffer.allocUnsafe(4);
// Write the buffer element in LE format
buf.writeUInt32LE(0xabcdabcd, 0);
// Display the buffer list
console.log(buf);
// Write the buffer element in LE format
buf.writeUInt32LE(0xfacedcba, 0);
// Display the buffer list
console.log(buf);


输出:

例 2:

// Node.js program to demonstrate the  
// Buffer.writeUInt32LE() Method
// Allocate a buffer
const buf = Buffer.allocUnsafe(4);
// Write the buffer element in LE format
buf.writeUInt32LE(0xabce, 0);
// Display the buffer list
console.log(buf);
// Write the buffer element in LE format
buf.writeUInt32LE(0xeab, 0);
// Display the buffer list
console.log(buf);


输出:

注意:以上程序使用node index.js命令编译运行。

参考:T2【https://nodejs . org/API/buffer . html # buff _ writeuint32 le _ value _ offset