ecmascript-7

问题 Based on this awesome Composition over Inheritance video by MPJ, I've been trying to formulate composition in TypeScript. I want to compose classes , not objects or factory functions. Here is my effort so far (with a little help from lodash ): class Barker { constructor(private state) {} bark() { console.log(`Woof, I am ${this.state.name}`); } } class Driver { constructor(private state) {} drive() { this.state.position = this.state.position + this.state.speed; } } class Killer { constructor

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 8 months ago . Improve this question It is fairly easy to check out the data about browser support for ECMAScript2015 (ES6), but I found it pretty difficult to have an equivalently clear table for all the following ES versions (ES7 to ES10). Mozilla has some info on their website, it is possible to

问题 I used Node.js and Ffmpeg to create animations. Because I was trying to avoid third-party avi/mp4 parsers, I decided to output the animation as raw rgb24 data file and then use some program to convert it to mp4 file. I found that Ffmpeg is free and open source which can do exactly it. So, I made a Node.js application which allocates a Buffer of size 1920 x 1080 x 3 (width times height times number of bytes per pixel), then I created a rendering context library, and finally I animated frame by

问题 I used Node.js and Ffmpeg to create animations. Because I was trying to avoid third-party avi/mp4 parsers, I decided to output the animation as raw rgb24 data file and then use some program to convert it to mp4 file. I found that Ffmpeg is free and open source which can do exactly it. So, I made a Node.js application which allocates a Buffer of size 1920 x 1080 x 3 (width times height times number of bytes per pixel), then I created a rendering context library, and finally I animated frame by

问题 I used Node.js and Ffmpeg to create animations. Because I was trying to avoid third-party avi/mp4 parsers, I decided to output the animation as raw rgb24 data file and then use some program to convert it to mp4 file. I found that Ffmpeg is free and open source which can do exactly it. So, I made a Node.js application which allocates a Buffer of size 1920 x 1080 x 3 (width times height times number of bytes per pixel), then I created a rendering context library, and finally I animated frame by

问题 I'm making the decision to no longer support legacy browsers AT ALL and dropping support for ES5 compilation/polyfills. I have my Angular project code compiling for ~85% coverage to "compilerOptions": { "target": "es2016", "module": "es2020", "lib": [ "es2019", "dom" These options control the project's code. However, Angular libraries compile to ES2015. How can we compile our project's packages to ES2016/17/18/19/20? 回答1: According to this stackoverflow post ES6 as the typescript target

问题 There are already a lot of cool features in ES6/ES7 for defining Javascript objects. However, the following pattern is common in Javascript: const obj = { requiredKey1: ..., requiredKey2: ... }; if (someCondition) { obj.optionalKey1 = ...; } Is there a way to define the object all at once with both optional and required keys? 回答1: You can use object spread to have an optional property. Note: Object Rest/Spread is a stage 4 proposal for ECMAScript. You might need the babel transform to use it.

问题 There are already a lot of cool features in ES6/ES7 for defining Javascript objects. However, the following pattern is common in Javascript: const obj = { requiredKey1: ..., requiredKey2: ... }; if (someCondition) { obj.optionalKey1 = ...; } Is there a way to define the object all at once with both optional and required keys? 回答1: You can use object spread to have an optional property. Note: Object Rest/Spread is a stage 4 proposal for ECMAScript. You might need the babel transform to use it.

问题 I've looked through the MDN resources here as well as here, as well as the WhatWg Fetch Spec, and for all that I can't figure out if the Fetch API is part of ECMAScript 5, 6, 7 or otherwise. All I can tell is that it isn't implemented consistently across browsers, and in some cases is not supported at all. Yet the spec definitely defines Fetch as Javascript: The Fetch Standard also defines the fetch() JavaScript API Source: link Is the Fetch API simply a proposal that is not on the books yet

问题 I am using the async/await function the following way async function(){ let output = await string.replace(regex, async (match)=>{ let data = await someFunction(match) console.log(data); //gives correct data return data }) return output; } But the returned data is an promise object. Just confused about the way it should be implemented in such functions with callback. 回答1: An easy function to use and understand for some async replace : async function replaceAsync(str, regex, asyncFn) { const