Node.js Buffer.write()方法
原文:https://www.geeksforgeeks.org/node-js-buffer-write-method/
Buffer.write() 方法将指定的字符串写入缓冲区的指定位置。如果缓冲区没有包含足够的空间来容纳整个字符串，将只写入字符串的一部分。但是，部分编码的字符不会被写入。
语法:
buffer.write( string, offset, length, encoding )
参数:这个方法接受上面提到的和下面描述的四个参数:
- String: It holds the string to be written into the buffer.
- Offset: Save the number of bytes to skip before writing the string. Its default value is 0.
- Length: Save the number of bytes written into the buffer. The default value is buffer.length-offset.
- Code: It stores the code of the value. The default value is utf8.
返回值:这个方法返回一个代表写入字节数的数字。
例 1:
// Node.js program to demonstrate the
// Buffer.write() method
// Create a buffer
var buf = Buffer.from('GeeksforGeeks');
buf.write('EE', 1);
console.log(buf.toString());
输出:
GEEksforGeeks
例 2:
// Node.js program to demonstrate the
// Buffer.write() method
// Create a buffer
const buf = Buffer.allocUnsafe(100);
const len = buf.write('GeeksforGeeks', 2, 5, 'utf8');
console.log(len.toString());
输出:
5
注意:以上程序使用node index.js命令编译运行。
参考:https://www . geeksforgeeks . org/node-js-buffer-allocunsafe-method/
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