Give you some popular scienceMainstream browsers
Learn web front-end, browsers and editors are our good friends
So there are It is necessary to understand some small knowledge about browsers
For example: What is a mainstream browser
Mainstream browser
A mainstream browser has a certain market share and has its own independent research and development kernel The browser can also be called a native browser
The common ones we all have are:
IE/Edge, Chrome, Safari, Opera, Firefox As for The qq browser, uc browser, etc. that are also commonly used by all of us are shell browsers
They just take the core of the native browser, streamline it, and package it,
Yeah Today is 2016.10.29
Let me show you today’s browser market share statistics
Net Market Share
From this picture, we can see which company There are more browser customers
Sure enough, chrome is still far ahead. Well, I also think chrome is the best browser...
is used to render web page content and convert your web page code into visible pages
In the early kernel, the js engine was also included, but now js engines are becoming more and more popular. Independent, you can put it forward separately
The core and changes of mainstream browsers are as follows
(The focus of the interview questions, many written online are outdated now, so I summarized it)
Kernel | |
---|---|
trident-> ;EdgeHTML | |
webkit->blink | ##Safari |
Firefox | |
Opera | |
Browser js engine
When extended Get to know it, don’t remember it carefully
Chrome | |
Safari | |
Firefox | |
##Opera | |
Here are some pictures
I didn't expect that IE, the winner of the first browser war, would end up in such a miserable situation
In the end, it was ruthlessly abandoned by Microsoft, ending in tragedy
If you don't want it, you don't want 22w lines of code
Decided to develop the Edge engine from scratch
The former IE used the monopoly of Windows to formulate its own independent "IE standard"
The past five years of IE There were no updates, and by the time it realized the problem, it was too late
The subsequent launch of IE7 and IE8 (the source of evil in writing compatibility) made it even more questionable and criticized
Having said this Actually, I just want to say that chrome is really great (~ ̄▽ ̄)~
Just kidding
I also hope everyone will remember the lessons of IE
Learning is like sailing against the current, if you don’t advance, you will retreat.
—–"Zengguang Xianwen"
The above is the content of the mainstream browser kernel and JS engine. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!
Browser kernel summary
The differences in performance and efficiency between Python and JavaScript are mainly reflected in: 1) As an interpreted language, Python runs slowly but has high development efficiency and is suitable for rapid prototype development; 2) JavaScript is limited to single thread in the browser, but multi-threading and asynchronous I/O can be used to improve performance in Node.js, and both have advantages in actual projects.

JavaScript originated in 1995 and was created by Brandon Ike, and realized the language into C. 1.C language provides high performance and system-level programming capabilities for JavaScript. 2. JavaScript's memory management and performance optimization rely on C language. 3. The cross-platform feature of C language helps JavaScript run efficiently on different operating systems.

JavaScript runs in browsers and Node.js environments and relies on the JavaScript engine to parse and execute code. 1) Generate abstract syntax tree (AST) in the parsing stage; 2) convert AST into bytecode or machine code in the compilation stage; 3) execute the compiled code in the execution stage.

The future trends of Python and JavaScript include: 1. Python will consolidate its position in the fields of scientific computing and AI, 2. JavaScript will promote the development of web technology, 3. Cross-platform development will become a hot topic, and 4. Performance optimization will be the focus. Both will continue to expand application scenarios in their respective fields and make more breakthroughs in performance.

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.


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