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Prototype and prototype chain in JS When talking about prototypes, we should first remember the following points, which are the key to understanding prototypes: 1. All reference types (arrays, functions, objects) can freely extend attributes (except null). 2. All reference types have a_ proto_ _ Property (also known as implicit prototype, wh ...

JQuery Mobile foundation 1. Page and dialog box This chapter introduces the method of using page control in JQuery Mobile with examples. Page control is not only a very important control in JQuery Mobile, but also an essential control. Although the usage is simple, it can reflect the depth of programmers' understanding of coding. This ...

Using babel to handle ES6 syntax Index. Write some ES6 syntax in the JS file const arr = [ new Promise(() => { }), new Promise(() => { }), ] arr.map(item => { console.log(item) }) Package using the npx webpack command (webpack-dev-server is not used here because the packaged files are placed directly in memory, making ...

Today, let's implement a simple packaging tool File dependency src ├─ a.js ├─ b.js ├─ c.js └─ index.js [external chain picture transfer failed. The source station may have anti-theft chain mechanism. It is recommended to save the picture and upload it directly (img-xxkfcw02-1643883138652)( https://raw.githubusercontent.com/nxl3477/md-img-sto ...

vue.js is the core * element UI is a support Vue JS UI component library * mock JS: since there is no back-end interface, you need to use local data to pretend to be back-end data. Technology stack vue.js+element UI+mock.js Initialize project use first vue-cli Initialize a project structure [if you haven't installed it yet vue-cli，S ...

stay In ES5, declared variables have only var and function has two forms. However, the variables declared by var have certain disadvantages (the problem that the inner variables may cover the outer variables and the circular variables used to count are leaked to global variables, which are described below), ES6 proposes the use of let an ...

The general framework of the viewpager in the previous section has been set up. We found that there is a rotation picture, that is, it can't rotate automatically, and can only slide left and right manually, and it can't slide indefinitely. If you slide to the beginning and end in order, you can't move. Next, we'll realize how to make the pictur ...

backgroundWelcome the Winter Olympics and look forward to the future together! 2022 Winter Olympics will begin soon. This paper uses three JS + react technology stack realizes winter and Olympic elements, and makes a 3D page full of interesting and commemorative Winter Olympic theme. The knowledge Points involved in this paper mainly include To ...

preface The notes are miscellaneous this time 1, Basic usage of events in Vue (1) Review event usage in native JavaScript Three elements Get event source (which object is triggered) Binding event, event type (how to trigger, click or keyboard input, etc.) Add event handler (what to run) Using events in this way is complicated. Let's lo ...

0. Why learn jQuery? jQuery is very useful! Get started quickly and operate DOM quickly!If you are interested in some web scripts, jQuery is a good helper. Combined with the three swords, it can help you automatically complete the automatic questionnaire filling and some web page repeated operationsFor web pages such as rotation map and waterf ...