/** * Created by udi on 2016/11/24. */var gulp = require(‘gulp‘);var babel = require(‘gulp-babel‘);var es7SrcJs = ["es7/*/*.js"];var descPath = "src";gulp.task(‘babelify‘, function () {    return gulp.src(es7SrcJs)        .pipe(babel({            presets: [‘es2015‘, ‘es2016‘, ‘es2017‘],            plugins: [["transform-runtime", {                "polyfill": false,                "regenerator": true            }]]        }))        .pipe(gulp.dest(descPath))        .on(‘error‘, function (err) {            console.log(err.stack);            this.emit(‘end‘);        })});gulp.task(‘watch‘, function(){    return gulp.watch(es7SrcJs, [‘babelify‘]);});gulp.task(‘default‘, [‘babelify‘, ‘watch‘]);

var abc = o=>{ return 1;}var sleep = function (time) {    return new Promise(function (resolve, reject) {        setTimeout(function () {            resolve();        }, time);    })};var start = async function () {    // 在这里使用起来就像同步代码那样直观    console.log(‘start‘);    await sleep(3000);    console.log(‘end‘);};start();