(function(exports, require, module, __filename, __dirname){
    console.log('test.');
});

setImmediate(() => console.log('setImmediate'));
setTimeout(() => console.log('timeout'), 0);
process.nextTick(() => {
    console.log('nextTick1')
    process.nextTick(() => console.log('nextTick2'))
});
// nextTick1
// nextTick2
// timeout
// setImmediate
// nextTick 是放在当前事件队列的最后，主意这个不能出现递归，不然其它异步都会异常
// setTimeout 放在 nextTick 和 setImmediate 中间
// setImmediate 是放在下一个事件队列队首

const { StringDecoder } = require('string_decoder')
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(b.toString());
  console.log(decoder.write(b))
}

const fs = require("fs");
const path = require("path");
const promisify = require("util").promisify;
const read = promisify(fs.readFile);
// read(path.join(__dirname,'./promisify.js'))
// .then( data => {
//   console.log(data.toString());
// })
// .catch(ex => {
//   console.log(ex)
// })
async function test() {
  try {
    const content = await read(path.join(__dirname, "./promisify.js"));
    console.log(content.toString());
  } catch (ex) {
    console.log(ex);
  }
}
test();