Node.js Buffer.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:
<Buffer cd ab cd ab>
<Buffer ba dc ce fa>
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:
<Buffer ce ab 00 00>
<Buffer ab 0e 00 00>
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
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