firebase javascript

This article mainly introduces factory-related information such as javascript framework design, which is easy to understand and can be viewed by partners who need it. The emergence of classes and inheritance in javascript indicates that javascript has reached the threshold for large-scale development. In the past, ECMAScript4 attempted to introduce classes, modul

This article mainly introduces factory-related information such as javascript framework design, which is easy to understand and can be viewed by partners who need it. The emergence of classes and inheritance in javascript indicates that javascript has reached the threshold for large-scale development. in the past, ECMAScript4 attempted to introduce classes, modul

The javascript keywords set in the list of common Javascript keywords (Reserved Words) refer to the Words that have specific meanings in the Javascript language and become part of the Javascript syntax. Javascript keywords cannot be used as variable names and function names.

This article mainly introduces the Closure (Closure) in JavaScript, the scope chain of the function call object and variable, and what is the Closure, and provides examples, if you need it, you can refer to the closure as an important feature of JavaScript. its biggest function is to save information during function operation. In JavaScript, many features of clos

A deep understanding of javascript prototype chain and inheritance, and a deep understanding of javascript In the previous article, I introduced the concept of prototype and learned the relationship among the three friends in javascript: constructor, prototype object, and instance: every constructor has a "patron saint"-a prototype object. The prototype object al

The subconscious will not use the object-oriented idea to write JavaScript code, nor will it have a deep understanding of prototype, closures, and other concepts. This leads to poor code writing.The most important thing to learn about JavaScript is to recognize that JavaScript is not a toy language. JavaScript is far m

Scopes are one of the most important concepts of JavaScript, and to learn JavaScript you need to understand how JavaScript scopes and scope chains work. Today's article provides a simple introduction to JavaScript scopes and scope chains, hoping to help you learn JavaScript

Summary of the 10 key habits of JavaScript developers, and summary of javascript With the continuous development of new technologies, JavaScript is no longer just a network language. Now we can see a lot of mobile phones that use JavaScript to build Web applications based on local browsers, and there are also a lot of

Basic javascript knowledge and basic javascript knowledge This article is suitable for beginners of javascript or those who have been learning the front-end for a while and are not clear about the js concept ~~. Objective This article is intended for students with weak javascript foundations to deepen their understandi

Summary of JavaScript performance optimization and javascript Performance Optimization With the continuous promotion of web technology, more and more applications are processing JavaScript on the client, making the performance of JavaScript in the browser the most important availability problem faced by developers. Thi

To realize the full potential of JavaScript, it is important to understand its nature, history and limitations.This section explains the origins of JavaScript and client-side scripting.Nombas and ScripteaseProbably in 1992, a company called Nombas developed an embedded scripting language called C-minus (C-minus-minus, or Cmm). The idea behind the Cmm is simple: A scripting language that is strong enough to

A. JavaScript syntax directory Grammar Operation Conditional statements Looping statements Function Object Two. Specific content2.1 Syntax　　JavaScript code can be executed through the html/xhtml document. There are two ways to do this, the first of which is to place the JavaScript code between the DOCTYPE HTML>HTMLLang= "en">Head

When I read the jQuery source code, I often think that those factors will make me unable to read the code. Which of the most critical factors is the earliest thought of as the architectural design of jQuery, when I finally found the jQuery architectural design portal, I found that the skillful use of the basic javascript syntax is the reference for reading the source code... syntaxHighlighter. all (); When I read the jQuery source code, I often think

1) Intro Not long ago I set up a technology group in a MM asked a question like this, she posted the code as follows: var a = 1;function hehe (){Window.alert (a);var a = 2;Window.alert (a);}Hehe (); The results of the execution are as follows: First Alert: Second alert: This is a surprising result, why does the first pop-up box show undefined instead of 1? The principle of this confusion I describe as follows: A variable in a page that is directly defined under the script label is a g

There are actually many JavaScript debuggers. Of course, these are just debuggers, and there is no way to compare them with the popular JavaIDE. However, from the perspective of debugging, the functions of these debuggers are sufficient. In fact, what I need is not a JavaScript IDE, but a JavaScript refactoring tool. This allows me to quickly refactor

I. Introduction to JavaScriptA historical review of 1.1 JavaScript.JavaScript was born in 1995. At the time, its main purpose was to handle some of the input validation operations handled by the server side. Before JavaScript is available, the form data must be sent to the server side to determineIf a required entry is not filled in, enter an invalid value. Netscape Navigator wants to solve this problem through Ja