Buffer.byteLength
console.log(Buffer.byteLength('test'));
console.log(Buffer.byteLength('我是C语言爱好者'));
每个中文是3个字节
Buffer.isBuffer
console.log(Buffer.isBuffer({}));
console.log(Buffer.isBuffer(Buffer.from([1,2,3])));
Buffer.concat()
const buf1 = Buffer.from('This ');
const buf2 = Buffer.from('is ');
const buf3 = Buffer.from('a ');
const buf4 = Buffer.from('book ');
console.log(Buffer.concat([buf1, buf2, buf3, buf4]).toString());
实例的常见用法
buf.length
const buf = Buffer.from('你好');
console.log(buf.length);
const buf2 = Buffer.alloc(10);
buf2[0] = 2;
console.log(buf2.length);
buf.toString()
console.log(buf.toString());
console.log(buf.toString('base64'));
buf.fill()
const buf3 = Buffer.allocUnsafe(10);
console.log(buf3);
console.log(buf3.fill(10,2,6));
buf.equals()
const buf = Buffer.from('test');
const buf2 = Buffer.from('test');
const buf3 = Buffer.from('test!');
console.log(buf.equals(buf2));
console.log(buf.equals(buf3));
比较两个内容是否一样：
buf.indexOf()
const buf = Buffer.from('test');
console.log(buf.indexOf('es'));
console.log(buf.indexOf('esa'));
Buffer乱码问题的解决
const buf = Buffer.from('中文字符串！');
for (let i = 0; i < buf.length; i += 5) {
const b = Buffer.allocUnsafe(5);
buf.copy(b, 0, i);
console.log(b.toString());
}
输出是乱码：
输出存在乱码
const StringDecoder = require('string_decoder').StringDecoder;
const decoder = new StringDecoder('utf8');
const buf = Buffer.from('中文字符串！');
for (let i = 0; i < buf.length; i += 5) {
const b = Buffer.allocUnsafe(5);
buf.copy(b, 0, i);
console.log(decoder.write(b));
}