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- What are the float attributes?
- Float attributes include left, right, none, inherit, etc. Detailed introduction: 1. left, the element floats to the left. When set to left, the element will break away from the normal document flow, float to the left, and allow other elements to be displayed on its right side; 2. right, the element floats to the right, and left Similarly, when set to right, the element will break away from the normal document flow, float to the right, and allow other elements to be displayed on its left side; 3. none, the element will not float, and when set to none, the element will return to normal, etc.
- Front-end Q&A 1595 2023-11-21 17:00:13
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- Why use double pseudo-elements to clear floats?
- Use double pseudo-elements to clear floats because pseudo-elements can select and manipulate parts of elements in HTML that cannot be directly selected. By using pseudo-elements, you can create additional layout elements, modify default element styles, solve layout problems, increase page accessibility, and achieve some special effects. The double pseudo-element method of clearing floats is a solution that is easy to use, has good compatibility, is highly flexible and has good scalability. In actual development, a suitable float clearing method can be selected based on project requirements and actual conditions.
- Front-end Q&A 968 2023-11-21 16:35:37
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- Why big websites don't use pseudo elements
- The reasons why large websites do not use pseudo elements: 1. Maintenance and readability; 2. Browser compatibility; 3. Performance considerations; 4. Style reuse and componentization; 5. Semanticization and SEO, etc. Detailed introduction: 1. Maintenance and readability. Large websites usually have huge code bases, which contain a large amount of CSS and JavaScript codes. Using pseudo elements may make the code structure more complex and reduce the readability and readability of the code. Maintainability; 2. Browser compatibility. Although modern browsers have good support for pseudo elements, there are still some old browsers and so on.
- Front-end Q&A 1137 2023-11-21 16:23:01
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- Why are there pseudo elements in the front end?
- Reasons for pseudo elements in the front end: 1. Customize layout and design; 2. Solve layout problems; 3. Improve accessibility; 4. Implement special effects; 5. Control complex layouts. Detailed introduction: 1. Customize layout and design. In web design, we often hope to have some special layout and design effects, such as adding a logo in front of a list item, adding a focus indicator inside a button, etc.; 2. Solving layout problems , sometimes you encounter some layout problems that are difficult to deal with, such as text wrapping effects, alignment of pictures and text, etc. Using pseudo elements, you can accurately control etc.
- Front-end Q&A 741 2023-11-21 15:16:39
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- Why float has error
- Float errors may be due to limitations of binary representation, IEEE 754 standards, rounding errors, computer memory limitations, algorithm approximation, hardware limitations, etc. Detailed introduction: 1. Limitations of binary representation. Computers use binary internally to represent floating point numbers. However, many real numbers cannot be accurately represented by limited binary representation; 2. IEEE 754 standard. In order to solve the problem of floating point number representation, IEEE has formulated a A set of standards, namely IEEE 754, for the representation and operation of floating point numbers; 3. Rounding errors, etc.
- Front-end Q&A 1490 2023-11-21 14:48:20
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- What is flexible layout flex?
- Flexible layout Flex is a modern web page layout method. It provides a more flexible and efficient layout method and can solve many problems that are difficult to handle with traditional layout methods. Flexbox is a one-dimensional layout model that organizes items in a container in a row or column and automatically adjusts the arrangement of items based on the size of the container and the characteristics of the items. The main features of flexible layout flex include: 1. Main axis and cross axis; 2. Alignment and distribution; 3. Properties of flexible items; 4. Line wrapping and reverse; 5. Space distribution and size adjustment, etc.
- Front-end Q&A 1516 2023-11-21 14:22:00
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- Why is flex called elastic layout?
- The reason why flex is called elastic layout is that it can achieve a more flexible and efficient web page layout, and it is elastic and can adapt to different screen sizes and device types. The emergence of this layout method solves many traditional layout methods. Problems that are difficult to deal with, such as vertical centering, item alignment, line wrapping, etc. Flexible layout features main and cross axes, alignment and distribution, properties of flex items, wrapping and reverse, spatial distribution and sizing. It adapts to different screen sizes and device types, enabling more flexible and efficient web page layouts.
- Front-end Q&A 788 2023-11-21 13:58:02
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- What are the rules of flexible layout?
- The rules of flexible layout include: 1. Declaration of containers and items; 2. Main axis and cross axis; 3. Alignment and distribution; 4. Properties of flexible items; 5. Line wrapping and reverse; 6. Space distribution and size adjustment; 7 , Cross-axis order; 8. Cross-axis alignment; 9. Additional rules for flexible containers; 10. Nested flexible containers, etc. Detailed introduction: 1. Declaration of containers and items. In flexible layout, containers are used to contain items. The container can be any block-level element; 2. Main axis and cross axis. Items in flexible layout are arranged on the main axis and cross axis. ;3. Alignment and distribution, etc.
- Front-end Q&A 949 2023-11-21 13:33:44
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- Which browsers does elastic layout not work with?
- Browsers that elastic layout is not suitable for include: 1. Internet Explorer 10 and earlier versions; 2. Early versions of Microsoft Edge; 3. Opera 12 and earlier versions; 4. Mobile device browsers, etc. Detailed introduction: 1. Internet Explorer 10 and earlier versions. Internet Explorer is an old browser developed by Microsoft. Although it was once very popular, its market share has gradually decreased over time and so on.
- Front-end Q&A 1194 2023-11-21 13:27:39
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- In what situations is it not suitable to use flexible layout?
- Scenarios where flexible layout is not suitable include compatibility issues, simple layouts, layouts that require a large number of nestings, hard coding of height and width, layouts that need to use specific positions, scenarios that need to support desktop applications, and scenarios that need to consider performance, etc. Detailed introduction: 1. Compatibility issues. Although elastic layout is widely supported by most modern browsers, there are still some old versions of browsers that may not fully support this layout; 2. Simple layout. For some simple layouts, use Flexible layout may be too complex; 3. A large number of nested layouts are required. Flexible layout is usually used to solve multiple layers and so on.
- Front-end Q&A 989 2023-11-21 13:22:26
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- What are the types of static positioning?
- Static positioning types include global satellite navigation systems, cellular network positioning, Wi-Fi positioning, Bluetooth positioning, RFID positioning, optical positioning, ultrasonic positioning and magnetic field positioning, etc. Detailed introduction: 1. Global satellite navigation system is a positioning technology based on satellite signals, the most famous of which is the global positioning system. By receiving signals from satellites, the receiving device can calculate the position coordinates of the receiver; 2. Cellular Network positioning is a technology that uses signals from mobile communication base stations to determine the location of a device, by measuring the signal strength between the device and the base station, etc.
- Front-end Q&A 1170 2023-11-21 12:00:34
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- What is static relocation technology?
- Static relocation technology includes optical static relocation technology, RFID static relocation technology, ultrasonic static relocation technology, magnetic field static relocation technology and inertial measurement unit static relocation technology. Detailed introduction: 1. Optical static relocation technology, mainly based on image processing and computer vision algorithms, determines the location of the object by analyzing the visual characteristics of the object, such as color, texture and shape; 2. RFID static relocation technology, RFID Technology is a technology for object recognition and location tracking through radio signals, among other things.
- Front-end Q&A 1793 2023-11-21 11:56:58
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- What is static positioning used for?
- Static positioning is used in geo-positioning, architecture and engineering, agriculture and environmental monitoring, driverless and intelligent transportation, and indoor positioning and navigation. Detailed introduction: 1. Geolocation. Static positioning plays an important role in geographic information systems. By using satellite navigation systems or other geolocation technologies, the longitude, latitude and altitude of any location on the earth can be accurately determined, which is important for navigation. , Map production, resource management and environmental monitoring are very important; 2. Architecture and engineering. In the field of architecture and engineering, static positioning is used to determine buildings, bridges, roads, etc.
- Front-end Q&A 1544 2023-11-21 11:47:27
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- Why does it still move after sticky positioning?
- Reasons why the element will still move after sticky positioning: 1. Initial position of the element; 2. Scroll speed; 3. Dynamic content; 4. Browser compatibility; 5. CSS style conflict; 6. JavaScript interaction. Detailed introduction: 1. Initial position of the element. If the initial position of the element is far from the viewport, the element will keep moving until it is scrolled to the position where sticky positioning is triggered. Only when the element is scrolled to the specified position and sticky positioning is triggered, the element will will stop moving; 2. The scrolling speed may also affect the performance of sticky positioning, if the scrolling speed is fast, etc.
- Front-end Q&A 985 2023-11-20 17:39:24
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- What would happen if it were not closed?
- Possible impacts of non-closure: 1. Limitation of variable scope; 2. Unable to achieve "memory" effect; 3. Unable to implement high-order functions; 4. More complex logic and code; 5. More difficult to implement private variables and private methods; 6. It is more difficult to achieve dynamic behavior; 7. It is more difficult to achieve data hiding and encapsulation, etc. Detailed introduction: 1. Limitation of variable scope. In many programming languages, variables are only visible inside the function in which they are declared. If you try to access these variables outside the function, an error will occur; 2. The "memory" effect cannot be achieved. , closures can be remembered and accessed, etc.
- Front-end Q&A 869 2023-11-20 16:21:41
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