Question

我知道有一个名为slice()的函数，但我正在寻找splice()，但该函数不存在，我将如何以其他方式进行操作？

var buffer = new Buffer("090001060001020304090000060001020304", "hex");
var packetLength = buffer.readUInt16LE(0)
console.log('before slice buffer = ' + buffer.toString('hex'))
buffer = buffer.slice(0, packetLength)
console.log('after slice buffer = ' + buffer.toString('hex'))

我得到的输出是

before slice buffer = 090001060001020304090000060001020304
after slice buffer = 090001060001020304

但是我需要获得

before slice buffer = 090001060001020304090000060001020304
after slice buffer = 090000060001020304

应该删除前9个字节，然后将其移到最前面的字节？

Answer 1

只需将缓冲区的起点更改为偏移9而不是从0开始

let newBuffer = buffer.slice(9).toString('hex')

Answer 2

解决了..

console.log('before slice buffer = ' + buffer.toString('hex'))
var newBuffer = new Buffer(buffer.length - packetLength);
buffer.copy(newBuffer, 0, packetLength, packetLength + buffer.length);
console.log('after slice buffer =  ' + newBuffer.toString('hex'))

before slice buffer = 090001060001020304090000060001020304
after slice buffer =  090000060001020304

从Buffer node.js前面删除元素

2 个答案: