ecmascript-6

问题 I am creating a web browsing exp with some drawing tool with JAVA FX 11 but while trying to load the javascript code which has let and const used these variables are simply getting ignored and throwing the exceptions. I am using maven 3.8.0, Java 1.8 and JavaFX 11. The code is as follows: <dependency> <groupId>org.openjfx</groupId> <artifactId>javafx-controls</artifactId> <version>12-ea+9</version> </dependency> <dependency> <groupId>org.openjfx</groupId> <artifactId>javafx-web</artifactId>

问题 I am trying to write a Typescript API service. For the service I need a way to check that the method exists when a function such as get is called. I realise I can do like get(endpoint: string) { this.handleRequest(); } post(endpoint: string, data: any) { this.handleRequest(); } But I don't particularly want to do that are the top of every method so I didn't know if there was a way to listen within the constructor of the Typescript class for a call of a child function. It seems a little far

问题 I am trying to write a Typescript API service. For the service I need a way to check that the method exists when a function such as get is called. I realise I can do like get(endpoint: string) { this.handleRequest(); } post(endpoint: string, data: any) { this.handleRequest(); } But I don't particularly want to do that are the top of every method so I didn't know if there was a way to listen within the constructor of the Typescript class for a call of a child function. It seems a little far

问题 I'm attempting to use the rest operator and restructuring to omit an entry in the object. Based on the documentation, rest should no longer include the key entry 575. After the operation, rest still has the same keys as state. I'm not sure what I'm doing wrong. Thanks in advance. book = { id: 575, title: "Vector Calc" }; state = { removedBooks: { 46: { id: 46, title: "economics" }, 575: { id: 575, title: "Vector Calc" } } }; const { [book.id]: data, ...rest } = state; console.log(rest); EDIT:

问题 I was trying to understand how promises works in javascript but I didn't found clear info about this, I would like to know if it possible and it is so how to do this using promises instead this code (equivalent) $.ajax({ type: 'post', cache: false, url: 'myfile.php', data: { info: info }, datatype: 'json', success: function(response) { console.log(response); } }); I ask this because I want to use only javascript without any framework or plugins, I have no problem with the other new feautures

问题 I am running a Node+Express API that is working quite well, the only problem I have is when returning a complex query as a response, the variable to which I set the response to is not getting reset between requests. It duplicates replies to the client such as replying 1, 2, 3 then the next reply replies 1, 2, 3, 1, 2, 3. So basically, it's concatenating data and not setting the allPosts variable to null again. Here is my code: var allPosts = []; chirprdb.allPosts = (userData) => { return new

问题 I have a mixed array that I need to sort by digit and then by alphabet var x = ['1','2A','2B','2AA','2','10A','10','11','12A','12B','12'] Desired Output sortedArray = ['1','2','2A','2B','2AA','10','10A','11','12','12A','12B'] I had tried using lodash but wasn't getting desired result var x = ['1','2A','2B','2AA','2','10A','10','11','12A','12B','12'] _.sortBy(x); //lodash result ["1", "10", "10A", "11", "12", "12A", "12B", "2", "2A", "2AA", "2B"] 回答1: You can use parseInt to get the number

问题 I am debugging another person's package (currently unmaintained) that runs in the Atom editor. At one point, this package uses vm.runInContext to define a class object, using code equivalent to the following: const vm = require('vm') myClass = vm.runInNewContext('class x {}', {}, 'file') I think this code runs in node.js , but I don't really know all the details of Atom's javascript environment. At any rate, I'm pretty sure it's running in ES6 or later. I believe that when this package was

问题 For some " extraction " operation I am trying to get the following snippet work, without using the spread operator, because IE 11 doesn't knows about spread operators. works in Chrome, but not IE 11: html_col_width =[{"targets":0, "width":50}, {"targets":1, "width":100},{"targets":2, "width":442}] ... some other code order: [ [response.order_by_column, response.order_by] ], columnDefs: [ ...html_col_width, {other: stuff}, {other: stuff} }) See columnDefs: ...html_col_width How can I achieve

问题 I try to convert Polymer.dedupingMixin ES6 function to TypeScript. I don't sure it's possible or not. https://github.com/Polymer/polymer/blob/v2.0.2/lib/utils/mixin.html Normally, TypeScript 2.2+ can work correctly for basic mixin function like the following code. type IConstructable = new (...args: any[]) => object; function extendClass<T extends IConstructable>(baseClass: T) { return class extends baseClass { instanceMethod_DynamicClass() { } static staticMethod_DynamicClass() { } } } class