ecmascript-6

问题 I am using docx 5.0.2 version for generating word document with images from the angular type script code. using webpack.optimize.UglifyJsPlugin. Getting this error when building the code . Unexpected token: name (DocumentAttributes) with webpack and UglifyJs. I assume Uglify is not able to minimize or beautify code related to docx library. Any suggestions from people using the docx package. Build used to work fine before docx package added to the package.json 回答1: The problem here is with

问题 when we use fetch in JS to issue a get request, we normally do thing like this fetch(endpoint).then(res => res.json()).then(result => ...) However I was watching Wes Bos's JS 30 courses and he called the intermediate result that the fetch returns a blob as in fetch(endpoint).then(blob => blob.json()).then(result => ...) I found the definition for blob here https://developer.mozilla.org/en-US/docs/Web/API/Blob I am not knowledgable enough to judge if Wes Bos was using the right term here to

问题 I'm trying to show another component using the react-bootstrap modal and react state. I'm following a react-bootstrap modal code and trying to customize the state my own way. I am able to create the state to open the modal without using React.useStae. But the problem is the modal isn't closing when I click the close button. So, How can I fixe this problem with the state? This is the react-bootstrap modal code that I'm following: and this is my code where I'm trying to open another component

问题 I have a array which I want to loop through so I use the map prototype. Inside the callbackfn of each element I want to run several expressions. const test = [{ name: "foo", value: "1" }, { name: "bar", value: "2" }, { name: "x", value: "3" }] let found = false; test.map(name => ( console.log(name.name), console.log(name.value), found = true )); I've separated each expression with a , . Whilst this runs correctly and produces the correct results I can see my eslint saying Unexpected use of

问题 I made a library and it needs to support multiple applications. However one of the sites is non-angular and will not support "modules", hence I am unable to use "export" on my function. My External library: var foo = (function() { function MyFunction(){ } MyFunciton.prototype.bar(){ } return MyFunction; }()); My Question: How do I import this into my component.ts without an export? 回答1: Include your script in your angular.json file in the scripts section. "architect": { "build": { "builder":

问题 I am trying to return the longitude and latitude of the user from the geolocation api but so far i keep getting errors when i try to use them outside the function. I have tried using the values within the function and they work but i cannot seem to get them to work outside the position function. I need a way to make the "location" object accessible to other functions. window.navigator.geolocation.getCurrentPosition( position => { const location = { lat:position.coords.latitude, long:position

问题 I want to pass child class instance to super class using super's constructor but I'm get this error super(this); this is not allowed before superclass constructor invocation Why i'm getting this error , also how could I resolve this issue class Parent { constructor(child) { this.child = child; } //...somewhere in code //child.doSomething(); } class Child extends Parent { constructor() { super(this); // <==== the error here } doSomething = () => { //... } } 回答1: There's no need to pass this to

问题 I have a Dataset Structure like this: _id: SomeMongoID, value: "a", counter: 1 } So initially my database table is empty. Now I have an array where value is like: const array = ["a", "a", "a"] What I want is initially the first time I do the search, so it will empty result so at that case in insert the query, now next time it get the entry so simply increment the counter. For that, I wrote the code: const testFunction = async(array) => { try { await Promise.all( array.map(async x => { const

问题 I have an external library (web-designer.js by Grapecity) which runs fine on plain HTML application. I want to use this library as it is in one of my Angular Components. I have added reference to this library, but I get errors while importing the file in Angular. This is how I reference the library (jQuery is a dependency): import '../app/lib/scripts/jquery'; import '../app/lib/scripts/web-designer'; The cdn link for library is http://cdn.grapecity.com/ActiveReports/AR13

问题 How to chain ES6 nested Promises with each Promise in the nesting having then and catch blocks? For example, what will be the Promise then and catch blocks chaining implementation equivalent for following nested AJAX calls implementation handled by success and error callbacks, considering every API call returns a Promise ? $.ajax({ url: 'url1', success: function() { console.log('URL1 call success'); $.ajax({ url: 'url2', success: function() { console.log('URL2 call success'); }, error