callback转Promise

 1 const fs = require(‘fs‘);
 2 
 3 let Promise = require(‘bluebird‘);
 4 
 5 let readSync = function(filePath) {
 6   return new Promise(function(resolve, reject) {
 7       fs.unlink(filePath, (err) => {
 8         if(err) return reject(err);
 9         return resolve();
10       })
11   })
12 }
13 
14 readSync(‘log‘).then(function(data) {
15   console.log(‘OKKKKK‘);
16 }).catch(function(err) {
17   console.log(err || ‘errror!!‘);
18 })