node . js buffer . readdouble()方法
原文:https://www . geesforgeks . org/node-js-buffer-readdouble-method/
Node.js 中的buffer . readdouble()方法用于以小端格式从给定偏移量的缓冲区中读取 64 位双精度值。
语法:
Buffer.readDoubleLE( offset )
参数:该方法接受单参数偏移量，该偏移量保存开始读取前要跳过的字节数。偏移值介于 0 < =偏移<= buf . length–8之间。其默认值为 0。
返回值:返回小端格式的整数值。
下面的例子说明了 buf.readDoubleLE()方法在 Node.js 中的使用:
例 1:
// Node program to demonstrate the
// Buffer.readDoubleLE() method
// Creating a buffer of given size
const buf = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);
// Display the result
console.log(buf.readDoubleLE(0));
console.log(buf);
输出:
5.447603722011605e-270
<Buffer 01 02 03 04 05 06 07 08>
例 2:
// Node program to demonstrate the
// Buffer.readDoubleBE() method
// Creating a buffer of given size
const buf = Buffer.from([11, 22, 33, 44, 55, 66, 77, 88]);
// Display the result
console.log("Functions of Buffer.readDoubleLE(int)");
console.log(buf.readDoubleLE(55));
console.log(buf);
输出:
Functions of Buffer.readDoubleLE(int)
internal/buffer.js:72
throw new ERR_OUT_OF_RANGE(type || 'offset',
^
RangeError [ERR_OUT_OF_RANGE]: The value of "offset" is out of range.
It must be >= 0 and <= 55 0\. received . .< pre>**注意:**以上程序使用`node index.js`命令编译运行。**参考:**T2【https://nodejs . org/docs/latest-v 11 . x/API/buffer . html # buffer _ buf _ readdouble _ offset=>
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