Node.js Buffer.writeFloatBE()方法
原文:https://www . geesforgeks . org/node-js-buffer-write float be-method/
Buffer.writeFloatBE()方法是 Buffer 模块中类 Buffer 的内置应用编程接口，用于将大端 32 位浮点值写入指定偏移量处的已分配缓冲区。
语法:
Buffer.writeFloatBE( value, offset )
参数:此方法接受两个参数，如上所述，如下所述:
- Value: This parameter specifies the 4-byte floating-point value to be written into the buffer. It should be a valid 32-bit big floating point value. When the value is not this value, the behavior is undefined.
- Offset: It specifies the number of bytes to skip before writing, or simply indicates the index in the buffer. The value of the offset is 0 < = offset < = buffer length–4 . Its default value is 0.
返回值:该方法返回一个整数值，该整数值是偏移量和以大端格式写入的字节数之和。
下面的例子说明了在 Node.js 中使用 Buffer.writeFloatBE()方法:
例 1:
// Node.js program to demonstrate the
// Buffer.writeFloatBE() method
// Allocating 16bytes buffer
const buf = Buffer.allocUnsafe(16);
// Writing 32bit or 4 byte floating point
// values to the buffer and printing
// returned value to console
console.log(buf.writeFloatBE(0xbabeface, 0));
console.log(buf.writeFloatBE(0x00000000, 4));
console.log(buf.writeFloatBE(0xffffffff, 8));
console.log(buf.writeFloatBE(0xcabcbcbc, 12));
// Printing the buffer
console.log(buf);
输出:
4
8
12
16
<Buffer 4f 3a be fb 00 00 00 00 4f 80 00 00 4f 4a bc bd>
例 2:
// Node.js program to demonstrate the
// Buffer.writeFloatBE() method
// Allocating 8bytes buffer
const buf = Buffer.allocUnsafe(8);
// Printing buffer before writing value
console.log("Before writing into buffer:");
console.log(buf);
// Writing 32bits or 4 bytes floating
// point values to the buffer and
// printing returned value to console
console.log(buf.writeFloatBE(0xbabebabe, 0));
console.log(buf.writeFloatBE(0xdecade20, 4));
// Printing the buffer after writing into buffer
console.log("After writing into buffer:");
console.log(buf);
输出:
Before writing into buffer:
<Buffer 00 00 00 00 00 00 00 00>
4
8
After writing into buffer:
<Buffer 4f 3a be bb 4f 5e ca de>
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 # buffe _ buf _ writefloatbe _ value _ offset
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