Node.js Buffer.writeInt8()方法
原文:https://www . geesforgeks . org/node-js-buffer-write int 8-method/
Buffer.writeInt8()方法是 Buffer 模块中类 Buffer 的内置应用编程接口，用于将值写入指定偏移量处的已分配缓冲区。
语法:
Buffer.writeInt8( value, offset )
参数:该方法接受两个参数，如上所述，如下所述:
- Value: This parameter specifies the number or value to be written into the buffer. Behavior is undefined when the value is not an integer value.
- Offset: It specifies the number of bytes to skip before writing, or simply indicates the index in the buffer. The value of offset is 0 < = offset < = buffer length–1 . Its default value is 0.
返回值:这个方法返回一个整数值，它是偏移量和写入字节数的和。
下面的例子说明了在 Node.js 中使用 Buffer.writeInt8()方法:
例 1:
// Node.js program to demonstrate the
// Buffer.writeInt8() method
// Allocating buffer of size 4
const buf = Buffer.allocUnsafe(4);
// Writing 8 bit numbers to its
// specified offset and printing
// returned value to console
console.log(buf.writeInt8(20, 0));
console.log(buf.writeInt8(-128, 1));
console.log(buf.writeInt8(-3, 2));
console.log(buf.writeInt8(127, 3));
// Printing buffer to console
console.log(buf);
输出:
1
2
3
4
<Buffer 14 80 fd 7f>
例 2:
// Node.js program to demonstrate the
// Buffer.writeInt8() method
// Allocating buffer of size 2
const buf = Buffer.allocUnsafe(2);
// Printing the buffer before writing into it
console.log("Before writing into buffer:");
console.log(buf);
// Writing 8 bit signed integers
console.log(buf.writeInt8(96, 0));
console.log(buf.writeInt8(-69, 1));
// Printing buffer after writing
// 8 bit signed integers in it.
console.log("After writing into buffer:");
console.log(buf);
输出:
Before writing into buffer:
<Buffer 98 98gt;
1
2
After writing into buffer:
<Buffer 60 bb>
注意:以上程序使用node index.js命令编译运行。
参考:https://nodejs . org/API/buffer . html # buff _ write int 8 _ value _ offset
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