The overall idea is: generate two semicircles through clipping to display a static progress bar, and then produce dynamic effects through rotation (rotate) angle changes. Let’s first review two basic knowledge points (1) An uncommon attribute of CSS: clip: rect(top, right, bottom, left); This attribute specifies a clipped rectangle, where the offset specified by top and bottom is The offset is calculated from the top edge of the element box, and the offset specified by right and left is calculated from the left edge of the element box (an important thing to note here is the calculation method of bottom and right). Look at the super clear picture below (I moved the picture from w3cplus directly, is it not illegal to have a watermark?): It should be noted that the clip attribute can only be set on elements with "position:absolute" or "position:" fixed" attribute. clip cannot set "position: relative" and "position: static"
1. Detailed introduction to the circular progress bar
Introduction: The overall idea is: generate two semicircles by clipping to display a static progress bar, and then generate dynamic changes by rotating (rotate) the angle. Effect. Let’s first review two basic knowledge points (1) An uncommon attribute of CSS: clip: rect(top, right, bottom, left); This attribute specifies a clipped rectangle. The offsets specified by top and bottom are calculated from the top edge of the element box, and the offsets specified by right and left...
2. CSS3+jQuery implements a circular progress bar Detailed explanation
Introduction: The overall idea is: generate two semicircles through clipping to display Static progress bar, and then produce dynamic effects by rotating (rotate) angle changes. Let’s first review two basic knowledge points (1) An uncommon attribute of CSS: {code...} This attribute specifies a cropped rectangle...
3 . JavaScript basic knowledge points
##Introduction: Tag (space separated) variable 1. What is it called Variable A variable is a container that stores book values;
4. Summary of 21 technical points and knowledge points of Java
Introduction: The purpose of writing this article is to summarize some of my experiences in using Java over the years, mainly related to some basic Java knowledge points. , so I also hope to share it with Java programmers who have just started and quasi-novices who are planning to enter the Java development industry. I hope I can give you some experience and help you learn and use Java better.
5. Summary of basic knowledge points of JavaScript
6.
Several basic knowledge points of PHP PHP basic knowledge for beginners PHP tutorial PHP hands-on
Introduction: php, basics: Several basic knowledge points of PHP: Because I am recruiting new people for training, I wrote this blog to briefly talk about output, operators, arrays, forms and other knowledge points in PHP. I hope it can bring some knowledge. Get started with Xiaoxianrou and give them help. The output is just like printf() in C. The output functions in PHP are echo and print; Because the output speed of print is slightly slower, we often use echo. When outputting variables, you can directly echo $name; (echo directly parses the variables) When outputting a string, use " " or ' ' to parse it echo and prin7.
10 PHP interview questions worth pondering Introduction:: 10 PHP interview questions worth pondering: Although the questions listed in the article seem simple, each one covers one or several basic knowledge points that are easily overlooked. I hope it can help. to your interviews and regular work hours. Q1 The first question is about weak types $str1 = 'yabadabadoo';$str2 = 'yaba';if (strpos($str1,$str2)) { echo "/"" . $str1 . "/" contains /"" . $str2 . "/"";} else {ech 8. html+css basic knowledge points_html/css_WEB-ITnose Introduction: basic knowledge points of html+css 9. Learning notes for front-end newcomers-html/css/js basic knowledge points_html/css_WEB- ITnose Introduction: Learning notes for front-end newbies-html/css/js basic knowledge points 10. Front-end newbies Study notes-html/css/js basic knowledge points (2)_html/css_WEB-ITnose Introduction: front-end newbie study notes-html/css/js basic knowledge points ( 2) [Related Q&A recommendations]:
The above is the detailed content of 10 recommended articles on basic knowledge points. For more information, please follow other related articles on the PHP Chinese website!

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.


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