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- What are the front-end selectors?
- Front-end selectors include element selectors, class selectors, ID selectors, attribute selectors, descendant selectors, child element selectors, pseudo-class selectors, pseudo-element selectors, etc. Detailed introduction: 1. The element selector is the most basic selector. It selects elements through the tag name of HTML elements; 2. The class selector selects elements based on the class attribute of the element. Use the ".classname" selector. You can select elements with specific class names; 3. ID selector selects elements based on their id attribute, etc.
- Front-end Q&A 1075 2023-09-28 15:40:56
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- What are the filter selectors?
- Filter selectors include: first-child, :last-child, :nth-child, :nth-last-child, :only-child, :not, :empty, :checked, :enabled, :disabled and :focus, etc. Detailed introduction: 1. :first-child, selects the first child element under the parent element; 2. :last-child, selects the last child element under the parent element, etc.
- Front-end Q&A 1578 2023-09-28 14:03:36
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- What are the default ports for web standards?
- The default ports of the web standard are: 1. HTTP, the default port number is 80; 2. HTTPS, the default port number is 443; 3. FTP, the default port number is 21; 4. SSH, the default port number is 22; 5. Telnet , the default port number is 23; 6. SMTP, the default port number is 25; 7. POP3, the default port number is 110; 8. IMAP, the default port number is 143; 9. DNS, the default port number is 53; 10. RDP , the default port number is 3389 and so on.
- Front-end Q&A 9380 2023-09-20 16:05:28
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- What technologies constitute web standards?
- Web standards include HTML, CSS, JavaScript, DOM, XML, XHTML, HTTP, W3C, ARIA, SEO and other technologies. Detailed introduction: 1. HTML, the basic language used to create the structure of web pages; 2. CSS, used to control the appearance and style of web pages; 3. JavaScript, used to add interactivity and dynamic functions to web pages; 4. DOM, based on hierarchy The structural method represents the API of the HTML document; 5. XML, the markup language used to describe the data structure, etc.
- Front-end Q&A 1796 2023-09-20 16:00:26
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- What are the disadvantages of sessionstorage?
- The disadvantages of sessionstorage are: 1. There is a capacity limit, which may cause some functions to not work properly, or the stored data needs to be frequently cleared and managed; 2. Data is not shared across sessions, and data cannot be shared between different sessions; 3. , Risk of data loss, causing users to lose their previous work or application status and need to start over; 4. Security issues, vulnerable to cross-site scripting attacks, attackers may use XSS vulnerabilities to access or tamper with data; 5. Not Suitable for persistent storage and so on.
- Front-end Q&A 1358 2023-09-20 15:54:15
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- What packages need to be imported for localstorage storage?
- No need to import any specific packages. When using localstorage, just use JavaScript's localStorage object, which is one of the global objects provided by the browser, without importing any specific package or library. Localstorage is a web storage mechanism provided in HTML5 that can store and retrieve data in the browser without using a server or other external storage device.
- Front-end Q&A 1151 2023-09-20 15:46:27
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- What standards do web standards consist of?
- Web standards consist of HTML, CSS, JavaScript, HTTP, URL, XML, SVG and other standards. Detailed description: 1. HTML, a standard language used to create the structure of web pages; 2. CSS, a standard language used to control the style and layout of web pages; 3. JavaScript, a scripting language used to add interactive and dynamic effects to web pages; 4 , HTTP, a protocol used to transmit and exchange information on the Web; 5. URL, an address format used to locate and access Web resources; 6. XML, etc.
- Front-end Q&A 2240 2023-09-20 15:40:30
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- What are the benefits of web standards
- The benefits of web standards include providing better cross-platform compatibility, accessibility, performance, search engine rankings, development and maintenance costs, user experience, and code maintainability and reusability. Detailed description: 1. Cross-platform compatibility ensures that the website can display and run correctly on different operating systems, browsers and devices; 2. Improving accessibility ensures that the website is accessible to all users; 3. , Speed up website loading speed, users can access and browse the website faster, provide better user experience; 4. Improve search engine rankings, etc.
- Front-end Q&A 1483 2023-10-12 16:15:30
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- Who are the makers of web standards?
- The setters of web standards are: 1. W3C, responsible for formulating and promoting core standards of the Web, such as HTML, CSS, XML, SVG, etc.; 2. IETF, responsible for formulating and updating core protocols of the Internet, such as TCP/IP, HTTP, SMTP, etc.; 3. ECMA, responsible for formulating and updating some Web-related standards, such as JavaScript (ECMAScript) and JSON; 4. WHATWG, committed to promoting the development and standardization of Web technology, etc.
- Front-end Q&A 1913 2023-09-20 15:29:48
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- What languages do web standards include?
- Web standards include a series of languages and technologies such as HTML, CSS, JavaScript, XML, XSL, JSON, SVG, SQL, etc., used to create, layout, style, interact and manage web pages and related data. Detailed description: 1. HTML, a markup language used to create the structure of web pages; 2. CSS, a style sheet language used to set the style and layout of web pages; 3. JavaScript, a scripting language used to add interactivity and dynamic functions; 4. XML, a markup language for storing and transmitting data, and more.
- Front-end Q&A 1683 2023-09-20 15:13:49
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- Expand and close on click with javascript
- As the needs of modern web design continue to grow, the need for dynamic effects is becoming more and more important. One of the common needs is to click on a button or link to expand or close content. At this time, we can use JavaScript to implement this function. JavaScript is a dynamic programming language that can manipulate HTML and CSS on web pages, as well as handle user interaction and dynamic effects. In the following demo, we will use JavaScript to create a button that expands and closes content. First, we need to create an HTM
- Front-end Q&A 1699 2023-05-29 22:40:08
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- Why botvs uses javascript
- The BOTVS team chose to use the JavaScript programming language when developing the BOTVS trading system. This decision was based on a variety of factors. First of all, JavaScript is one of the most popular and important programming languages in today's Internet field. It is mainly used to write interactive effects on the front end of web pages. It can also be applied to back-end server-side programming, desktop application development, mobile application development, and game development. and many other fields. The BOTVS trading system needs to run on different terminals, including web version and mobile APP version, so choose
- Front-end Q&A 987 2023-05-29 21:58:08
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- How to develop your own javascript
- In the modern Internet era, Javascript has become the most indispensable language for front-end development. At the same time, Javascript has gradually become one of the essential skills for some back-end and desktop applications. However, developing high-quality Javascript is not an easy task. This article explains how to develop your Javascript skills so you can become more comfortable writing code. 1. Learn basic syntax. First, if you want to develop high-quality Javascript
- Front-end Q&A 1205 2023-05-29 20:44:36
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- How to introduce css into html
- How does HTML introduce CSS as the basis for front-end development? The relationship between HTML and CSS complements each other. HTML is responsible for building the page structure and content, while CSS is responsible for adding color and beautifying the page on this basis. So, how to introduce CSS styles into HTML documents? This article will introduce how to introduce CSS and what to pay attention to. 1. Reference external CSS in the HTML header. This is the most common and recommended way to reference CSS. Taking a common page structure as an example, add a li in the HTML head tag
- Front-end Q&A 1519 2023-05-29 19:55:06
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- escape html
- Escaped HTML refers to converting special characters into HTML entities so that these characters can be displayed correctly in web pages. When writing HTML code, if you include some special characters directly in the text, such as "<", ">", "&", etc., it will cause the browser to misunderstand the meaning of the characters, resulting in page errors or incomplete display. Therefore, when using these special characters, we need to escape them into HTML entities to ensure that the page can be parsed by the browser normally. Here are some common HTML entities and their corresponding characters: - < – less than sign
- Front-end Q&A 939 2023-05-29 19:45:09
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