ecmascript-2017

问题 I have previously successfully tested an angular controller that uses ES7 async/await syntax with jasmine - async updateGridAsync() { const paging = angular.copy(this.gridData.getServerCallObj()); } try { const model = await this.service.getAsync(paging); this._$rootScope.$apply(); } catch (e){this._notification.error(this._$rootScope.lang.notifications.unexpectedError); } } it('updateGridAsync() should update the gridData when succeed', async (done) => { expect(ctrl.gridData.totalItems)

问题 Does making a function async make it asynchronous? I started using async-await in place of promise chain. I did something like async function f(){ let r = await first(); let d = await sec(r); return d; } On calling this function I was able to see that all code happened asynchronously. But in some older article I read we can't create asynchronous function in javascript. So does making function async makes it asynchronous. 回答1: Does making a function async make it asynchronous? No, it makes it

问题 Does making a function async make it asynchronous? I started using async-await in place of promise chain. I did something like async function f(){ let r = await first(); let d = await sec(r); return d; } On calling this function I was able to see that all code happened asynchronously. But in some older article I read we can't create asynchronous function in javascript. So does making function async makes it asynchronous. 回答1: Does making a function async make it asynchronous? No, it makes it

问题 Are there any issues with using async / await in a forEach loop? I'm trying to loop through an array of files and await on the contents of each file. import fs from 'fs-promise' async function printFiles () { const files = await getFilePaths() // Assume this works fine files.forEach(async (file) => { const contents = await fs.readFile(file, 'utf8') console.log(contents) }) } printFiles() This code does work, but could something go wrong with this? I had someone tell me that you're not

问题 In ES5, Boolean.prototype is a Boolean object: The Boolean prototype object is itself a Boolean object (its [[Class]] is "Boolean") whose value is false. In ES6 / ES2015, it isn't: The Boolean prototype object is an ordinary object. It is not a Boolean instance and does not have a [[BooleanData]] internal slot. In ES2016, it is once again: The Boolean prototype is itself a Boolean object; it has a [[BooleanData]] internal slot with the value false. (and it remains so in ES2017 as well.) The

问题 How to reuse some existing ES6 classes in Vue Js. Have a class which has a variable being updated by observable. class A { public a: string; someobservable.subscribe((a) =>{ this.a = a; }) } In vue.JS have created the object of this class. Sample how property is been used: created: { objA = new A(); } methods: { getA() { if(this.objA !== undefined){ return objA.a; } } } and in vue template: <div>{{getA()}}</div> The value in template gets out of sync with value of variable in class. Is there

问题 How to reuse some existing ES6 classes in Vue Js. Have a class which has a variable being updated by observable. class A { public a: string; someobservable.subscribe((a) =>{ this.a = a; }) } In vue.JS have created the object of this class. Sample how property is been used: created: { objA = new A(); } methods: { getA() { if(this.objA !== undefined){ return objA.a; } } } and in vue template: <div>{{getA()}}</div> The value in template gets out of sync with value of variable in class. Is there

问题 Are there any issues with using async / await in a forEach loop? I'm trying to loop through an array of files and await on the contents of each file. import fs from 'fs-promise' async function printFiles () { const files = await getFilePaths() // Assume this works fine files.forEach(async (file) => { const contents = await fs.readFile(file, 'utf8') console.log(contents) }) } printFiles() This code does work, but could something go wrong with this? I had someone tell me that you're not

问题 I am so confused about this. All I want to do is simply break up my javascript into modules, and include them in certain pages. Some pages may need my user-module.js , some pages may not. I have Googled, read the tutorials, and it's still not working for me. Here is a simple test case: 1. Include my script from my html <script src="../js/login-view-model.js"></script> Now, inside there... 2. TRY to include another module/js file // LoginViewModel // I NEED MY IMPORT HERE import { userService

问题 I assign two calls to the web service in two variables in referencesPromise and contactTypesPromise $onInit() (I can create a new method for that, if needed) $onInit() { const referencesPromise = this.ReferenceService.getMultipleReferences(this.AgentReferences) const contactTypesPromise = this.ContactService.getContactTypes() Promise.all([referencesPromise, contactTypesPromise]).then((responses) => { this.references = responses[0] this.contactTypes = responses[1] const stateParams = this.