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I. default value of function parameter //Practice before es6 function log(x,y){ var y=y||'world'; console.log(x,y); } log('hello'); // hello world log('hello',0); //hello world **: when the parameter y is assigned to false, the default value is valid. This may not be what we want. You may make the following improvemen ...

Article reference Summary of ES6 in React.js Case description import React from "react" import { NavBar, Button, Icon } from "antd-mobile" class Photegraph extends BaseComponent { // video and mediaStreamTrack are properties of the photographic class video; mediaStreamTrack; // Constructor constructor (props) { ...

Main points: 1. Add the display:flex display effect to the parent element that needs to scale the layout, set the value of flex in the child element, and then divide it by proportion. If one subset element is 1 and the other is 2, one takes up one-third and the other two-thirds. 2. Font shadow takes up a lot of memory, not re ...

function App1() { return <Greeting firstName="Ben" lastName="Hector" />; } function App2() { const props = {firstName: 'Ben', lastName: 'Hector'}; return <Greeting {...props} />; } <MyComponent message="&lt;3" /> <MyComponent message={'<3'} /> <MyComponent message="hello world" /> ...

Last weekend, I saw the source code of Vuex. I was inspired. Why are all Vuex. So Dongtong wrote a plug-in one afternoon to help Vue use Redux Gayhub Url Vue-with-Redux This is a plug-in used to help Vue use Redux to manage state. Redux is a very popular state management tool. Vue with Redux provides you with a way to use Re ...

Design sketch: Explain: 1. This function is based on this blog: Path path playback with ArcGIS JS API But there are some small problems: first of all, the car does not move at a constant speed, but the running time of each section is fixed, so it has been modified on this blog; on the other hand, there is no way to set the ...

The first is the use of thmeleaf th: attr set property value https://blog.csdn.net/sun_jy2011/article/details/40215423 Some uses of th tag https://segmentfault.com/a/1190000009903821 Th: if th: text th: value th: selected, etc <a href="register.html" title="" th:unless="${session.user} ne null" >Register</a> ...

(1) automatic construction of front-end projects 1. Create myProject project files and corresponding folders var projectData ={ 'name':'myProject', 'fileData':[ { 'name':'css', 'type':'dir' },{ 'name':'js', 'type':'dir' },{ 'name':'images', ' ...

Step by step implementation of web program information management system In the web program, especially in the information management system, the login function must have and be very important. Every learning program development or later work, will meet the needs of landing function. And the most basic function that login func ...

scene Closure generation Internal function depends on external scope variable, that is, internal holding external reference does not release (extends the life cycle of reference variable, prolongs life) The essence of variable is actually a placeholder, whose value is the real operation object Values can be scalars for each ...