三种控制异步程序的方法
import fs from 'fs'
import util from 'util'
const path = '/Users/hczhao/code/flow/algor/sort/heap.py'
// -----------------------------------------------------------------------------
// Callback style
fs.readFile(path, (err, data) => {
if (err) return console.log(err)
console.log(data.toString())
})
const promiseReadFile = util.promisify(fs.readFile)
// -----------------------------------------------------------------------------
// Promise style
promiseReadFile(path)
.then(data => {
console.log(data.toString())
})
.catch(err => {
console.log(err)
})
// -----------------------------------------------------------------------------
// Async/Await style
const readFileAwait = async (path) => {
try {
const data = await promiseReadFile(path)
console.log(data.toString())
} catch(err) {
console.log(err)
}
}
readFileAwait(path)