/*
const buf = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5]);
const json = JSON.stringify(buf);

// 输出: {"type":"Buffer","data":[1,2,3,4,5]}
console.log(json);

const copy = JSON.parse(json, (key, value) => {
    return value && value.type === 'Buffer' ?
        Buffer.from(value.data) :
        value;
});

// 输出: <Buffer 01 02 03 04 05>
console.log(copy);
*/

/*//阻塞
var fs = require('fs');
var data = fs.readFileSync('input.txt');
console.log(data.toString());
console.log("end");*/

/*//非阻塞
var fs = require('fs');
fs.readFile('input.txt',function (err,data) {
    if (err){
        console.error(err);
         return;
    }
    console.log(data.toString());
})
console.log("程序执行结束!");*/

/*// 引入 events 模块
var events = require('events');
// 创建 eventEmitter 对象
var eventEmitter = new events.EventEmitter();

// 创建事件处理程序
var connectHandler = function connected() {
    console.log('连接成功。');

    // 触发 data_received 事件
    eventEmitter.emit('data_received');
}

// 绑定 connection 事件处理程序
eventEmitter.on('connection', connectHandler);

// 使用匿名函数绑定 data_received 事件
eventEmitter.on('data_received', function(){

    console.log('数据接收成功。');
});
// 触发 connection 事件
eventEmitter.emit('connection');
console.log(eventEmitter.listenerCount('connection'));
console.log("程序执行完毕。");*/


/*const buf = Buffer.from('runoob', 'ascii');
console.log(buf)
// 输出 72756e6f6f62
console.log(buf.toString('hex'));

// 输出 cnVub29i
console.log(buf.toString('base64'));*/

/*//写入缓冲区
buf = Buffer.alloc(256);
len = buf.write("www.runoob.com");

console.log("写入字节数 : "+  len);*/

/*const buf = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5]);
const json = JSON.stringify(buf);

// 输出: {"type":"Buffer","data":[1,2,3,4,5]}
//console.log(json);

const copy = JSON.parse(json, (key, value) => {
    if(value && value.type === 'Buffer'){
        console.log(value.data)
    }else{
        console.log(value)
    }
    /!*return value && value.type === 'Buffer' ?
        Buffer.from(value.data) :
        value;*!/
});

// 输出: <Buffer 01 02 03 04 05>
//console.log(copy);*/
/*

console.log(__filename)   // 返回当前模块文件解析后的绝对路径 D:\git的仓库\nodejs\hello.js

console.log(__dirname)   // 返回当前模块文件所在的目录解析后的绝对路径 D:\git的仓库\nodejs

var date = new Date();
console.log(date.getFullYear() + "年" + date.getMonth() + "月" + date.getDay() + "天" + date.getHours() + "时")


console.log(process.title);
setTimeout(function () {
   process.exit();
},6000)
*/
/*process.stdin.resume();
process.stdin.on('data',function (chunk) {  //chunk是用户输入的值，可以用别的字母替代，但是data不可以用别的替代
    console.log('用户输入' + chunk)
})*/

var bf = new Buffer("miaov");
console.log(bf.toString("utf-8",1))
console.log(bf.toString("utf-8",0))
console.log(bf.toString("utf-8",1,3))
console.log(bf.toString("utf-8",1,5))
console.log(bf.toString("utf-8",0,5))