buffer操作,扩展buffer的分割方法

let a= new Buffer('abc');
let b = new Buffer('ddd');

let c = Buffer.concat([a,b]);
console.log(c.toString());

let d=new Buffer('abccc-=-dddder-=-qwerqwer');

console.log(d.indexOf('-=-'));

let e=new Buffer('abccc-=-dddder-=-qwerqwer');

console.log(e.slice(17).toString());

console.log(Buffer.split);

//扩展方法
let bb=new Buffer('abccc-=-dddder-=-qwerqwer');

Buffer.prototype.split=Buffer.prototype.split||function (b){
  let arr=[];

  let cur=0;
  let n=0;
  while((n=this.indexOf(b, cur))!=-1){//找分隔符b，从cur位置开始找，找到返回位置赋值给n
    arr.push(this.slice(cur, n));
    cur=n+b.length; //跳过分割符的位置
  }

  arr.push(this.slice(cur));

  return arr;
};

let arr=bb.split('-=-');
console.log(arr);

console.log(arr.map(buffer=>buffer.toString()));

输出

abcddd
5
qwerqwer
undefined
[ <Buffer 61 62 63 63 63>,
  <Buffer 64 64 64 64 65 72>,
  <Buffer 71 77 65 72 71 77 65 72> ]
[ 'abccc', 'dddder', 'qwerqwer' ]