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- What to do if ajax transmits Chinese garbled characters
- Solutions for ajax to transmit Chinese garbled characters: 1. Set a unified encoding method; 2. Server-side encoding; 3. Client-side decoding; 4. Set HTTP response headers; 5. Use JSON format. Detailed introduction: 1. Set a unified encoding method to ensure that the server and client use the same encoding method. Under normal circumstances, UTF-8 is a commonly used encoding method because it can support multiple languages and character sets; 2 , Server-side encoding. On the server side, ensure that the Chinese data is encoded in the correct encoding method and then passed to the client, etc.
- Front-end Q&A 1712 2023-11-15 10:42:24
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- What are the disadvantages of static relocation technology?
- The disadvantages of static relocation technology are memory space occupation, poor portability, security issues, reduced availability and performance impact, etc. Detailed introduction: 1. Occupying memory space. When the program is loaded into the memory, sufficient memory space needs to be allocated to the program to store the program's instructions and data. Since static relocation technology loads the program into a fixed memory location, when When a program is running, the memory space it occupies cannot be used by other programs; 2. Poor portability, because the program is loaded into a fixed memory location, when the program needs to be migrated to other computers, etc.
- Front-end Q&A 743 2023-11-14 17:39:47
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- What is fast static relative positioning
- Fast static relative positioning is a technology used for positioning and navigation. It achieves high-precision positioning and navigation functions by using multiple sensors and algorithms. This technology has great application in the fields of unmanned vehicles, indoor positioning, drone navigation, etc. Broad application prospects. The core of fast static relative positioning technology is to use data from multiple sensors to estimate the position of a vehicle or equipment. These sensors can include inertial measurement units, cameras, lidar, etc. By fusing the data from these sensors, high accuracy can be obtained positioning results.
- Front-end Q&A 1407 2023-11-14 16:56:10
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- What are the advantages of static relocation technology?
- The advantages of static relocation technology include improving system performance, simplifying program design, improving system security, improving memory utilization, improving system portability and simplifying operating system design. Detailed introduction: 1. Improve system performance. Static relocation technology can determine the physical addresses of programs and data when the program is loaded, thus avoiding the address translation process every time the program is run, reducing system overhead and improving system performance. performance; 2. Simplify program design, static relocation technology can load programs and data to specified physical memory addresses, etc.
- Front-end Q&A 830 2023-11-14 16:20:30
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- What are the fixed positioning methods?
- Fixed positioning methods include using the CSS attribute position, using JavaScript to achieve fixed positioning, using plug-ins to achieve fixed positioning, etc. Detailed introduction: 1. Use the CSS attribute position. "position: fixed" is an attribute in CSS that can fix an element at a specified position on the page. By setting the top, bottom, left, and right attributes of the element, you can adjust the position of the element on the page. position; 2. Use JavaScript to achieve fixed positioning, etc.
- Front-end Q&A 1711 2023-11-14 14:50:03
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- What are the values of the display attribute in h5
- The values of the display attribute in h5 include block, inline, inline-block, none, table, flex, grid, list-item, inherit, initial, etc. Detailed introduction: 1. block, use the block value to make the element display at the block level, that is, the element will occupy an exclusive line, and the width defaults to 100% of the parent container; 2. inline, use the inline value to make the element display inline, that is, the element will not Exclusive line and so on.
- Front-end Q&A 1439 2023-11-14 13:46:06
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- What are the disadvantages of display
- The disadvantages of display are that it is difficult to implement adaptive layout, affects document flow, is not conducive to SEO, and may cause performance issues, compatibility issues, etc. Detailed introduction: 1. It is difficult to implement adaptive layout. In responsive design, it is usually hoped that elements can be adaptively laid out according to the screen size and direction of different devices. When using the display attribute, it is often necessary to manually control the display mode of elements through JavaScript. , which increases the complexity of development and the difficulty of maintenance; 2. Affects the document flow, changing the display attribute of elements, etc.
- Front-end Q&A 1410 2023-11-14 13:41:56
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- What properties does display have?
- The properties of display include block, inline, inline-block, none, flex, grid, etc. Detailed introduction: 1. block, use the block attribute value, the element will be displayed in the form of a block-level element, the block-level element will occupy an exclusive line, and will automatically wrap before and after; 2. inline, use the inline attribute value, the element will be displayed as an inline element In the form of display, inline elements will not occupy a line alone, but will be displayed on a line with other inline elements; 3. inline-block, etc.
- Front-end Q&A 4919 2023-11-14 13:22:05
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- What is event bubbling commonly used for?
- Event bubbling is often used in event delegation, dynamic addition of elements, event proxy, event cancellation and blocking, etc. Detailed introduction: 1. Event delegation is one of the important applications of the event bubbling mechanism. By registering the event handler on the parent element instead of each child element, event monitoring of a large number of child elements can be achieved, which can reduce Memory consumption and improved performance; 2. Add elements dynamically. When adding elements dynamically, if the event bubbling mechanism is not used, event handlers need to be manually registered for each newly added element, which will lead to code redundancy and so on.
- Front-end Q&A 907 2023-11-14 13:15:16
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- What is preventing event bubbling?
- Preventing event bubbling refers to the process of programmatically preventing events from being passed from child elements to parent elements or ancestor elements in web development. Event bubbling is in a nested element hierarchy, when an event fires on a child element, it is automatically propagated up to the parent element, and then to ancestor elements, until it reaches the top-most element. Preventing event bubbling is a technology commonly used in web development. It can better control and manage the propagation of events. By preventing event bubbling, unnecessary event triggering and processing can be avoided, improving user experience and code efficiency.
- Front-end Q&A 1161 2023-11-14 11:49:29
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- What is the principle of forced type conversion?
- The principle of forced type conversion is to perform conversion based on the representation range and precision of the data type. Within the computer, different data types occupy different amounts of space in the memory. When converting one data type to another data type, The computer will perform conversions based on these different space sizes. Casting can be divided into two types, conversion from a smaller data type to a larger data type, and conversion from a larger data type to a smaller data type. It is necessary to pay attention to the representation range and precision of the data type, and avoid possible data overflow and precision loss.
- Front-end Q&A 702 2023-11-14 11:27:14
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- What is the connection between bom and dom?
- The connection between BOM and DOM: 1. BOM and DOM are key concepts in Web development, and together they form the basis of Web applications; 2. BOM and DOM are both operated with js language, and can be used by js developers The BOM object controls the size, position, etc. of the browser window; 3. There is some interaction between BOM and DOM. Through the window object of BOM, developers can access the DOM and use DOM methods to operate elements in the document; 4. BOM and DOM operations can interact with each other.
- Front-end Q&A 1050 2023-11-14 11:12:27
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- What is the use of learning BOM and DOM?
- The role of learning BOM and DOM: 1. Learning BOM can help developers control and operate browser windows; 2. Learning DOM can help developers operate and control various elements of web pages; 3. Learning BOM and DOM can also improve the performance of web pages and efficiency; 4. Learning BOM and DOM can also improve the accessibility and maintainability of web pages. Learning BOM and DOM is very important for web developers. They provide a rich set of tools and technologies that can improve user experience, enhance the interactivity of web pages, and make web pages more dynamic and actionable.
- Front-end Q&A 752 2023-11-14 11:03:27
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- What models are bom and dom?
- BOM is the browser object model, and DOM is the document object model. BOM is a model used to describe browser windows and various objects provided by the browser. It is the core component of the browser. BOM can access and operate objects such as browser windows and frames. DOM provides a set of APIs that enable developers to access and manipulate elements and attributes in documents through scripting languages. Its core concepts include nodes, elements, attributes, text, etc. The root node of the DOM tree is the document object, through which Access the entire document's content.
- Front-end Q&A 912 2023-11-13 17:09:25
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- What does regular expression () mean?
- Regular expression () is the meaning of extracting matching strings. It mainly has two functions: 1. Grouping. In regular expressions, parentheses can be used to combine some characters to form a group, which is usually used to determine priority, number of repetitions or special matching rules; 2. Capture, When specific text is matched within the brackets in the regular expression, the text can be saved for subsequent use, for replacement operations or reference in other regular expressions, etc.
- Front-end Q&A 3667 2023-11-13 15:52:11
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