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HTML Basic label 1 form type Please write out the following types of input boxes in turn. The type is password, and the default value is "nowcoder"The type is the check box and the status is checked <form> <input type = "password" value = "nowcoder"> <input type = "checkbox" checked = "checked"> &l ...

What is Promise Promise is a solution to asynchronous programming. In fact, it is a constructor. It has all, reject and resolve methods, and then, catch and other methods on the prototype. (ps: what is a prototype https://blog.csdn.net/qq_34645412/article/details/105997336 ) Promise objects have the following two characteristics. (1) The ...

webStorageBasic conceptswebStorage provides two storage methods, localStorage and sessionStorage.localStorage is a persistent storage, and the stored content will exist permanently if it is not deleted activelysessionStorage is session level storage. Close the browser and destroy itThe specific difference isAfter closing the web page and reopen ...

JavaScript class notes I 7.1 local JavaScript variables Variables declared inside JavaScript functions (using var) are local variables, so they can only be accessed inside functions. Variables with the same name can be declared in different functions, because the function fails when the local variable is out of the function. 7.2 global Java ...

background Recently, the company has an account recharge business scenario that needs to be migrated from offline payment to online payment: Offline payment scenario: customers pay through POS machine or scan the QR code provided by the sales classmate to complete the payment. Then the sales classmate enters the relevant information into the ...

Detailed explanation of jQuery events in JavaScript Because JavaScript runs in a single thread mode in the browser, after the page is loaded, once all the JavaScript code on the page is executed, you can only rely on the trigger event to execute the JavaScript code. After receiving the user's mouse or keyboard input, the browser will automati ...

reference material: Vue official manual Editor: Hbuider X We need to do a small program development. We have selected the framework of uni app, so we should learn vue first ps: 2022-1-24 updated to Class is bound to Style Template syntax Vue.js uses an HTML based template syntax that allows developers to declaratively bind the DOM to the ...

In the last article, we introduced some basic knowledge of electron, Get started with Electron and teach you to write complete practical cases Here, we will continue to introduce the packaging and automatic update of Electron based on this project. Generate Icon Before packaging the application, prepare an icon for the application as the inst ...

1. Tell me about your understanding of the box model?? When a document is laid out, the browser's rendering engine will represent all elements as rectangular boxes according to one of the standard CSS basic box model s A box consists of four parts: content, padding, border and margin In CSS, the box model can be divided into: W3C standard b ...

First, we know Promise from console Dir (Promise) start The prototype method in prototype needs an instance all race reject resolve is a static method, which is used directly How to use Promise? new Promise((resolve,reject) => { setTimeout(() => { console.log('implement Promise') resolve('Data to return') },2000) }) ...