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- What is the fixed positioning method?
- Fixed positioning is a CSS property used to control the position of an element in the browser window or parent element. By using fixed positioning, the element can be fixed at a specific position on the screen. No matter the user scrolls the page or changes the window size, the element will remain unchanged. Stay in designated position. The characteristics of the fixed positioning method include that the element is out of the document flow, the position of the element is fixed, and it does not occupy space. It is often used to create navigation bars, floating ads and other elements that need to always remain in a specific position on the page. However, you need to pay attention to the problem of occluding other elements, which can be controlled using the z-index attribute.
- Front-end Q&A 630 2023-12-15 17:41:07
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- What is html fixed positioning
- Fixed positioning of HTML is a CSS positioning method that positions an element relative to the browser window. When an element is set to fixed positioning, it breaks away from the normal document flow and is positioned relative to the position of the browser window, even if When the page scrolls, the element will always stay in the same position and will not move as the page scrolls. Often used for elements that need to always be displayed on the page or to create some special effects. When using, you need to pay attention to the rationality and accessibility of its use to ensure that it does not have a negative impact on the layout and use of the page.
- Front-end Q&A 1102 2023-12-15 17:21:26
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- What positioning is based on fixed positioning?
- Fixed positioning is based on the browser window, not the parent element or other elements. When an element's position attribute is set to fixed, the element is removed from the document flow and its position is determined by the top, right, bottom, and left attributes. When using pixel values, the element is positioned relative to the upper left corner of the browser window. You can adjust the element's position by setting the value of these properties. If you use a percentage value, the position of the element is dynamically adjusted based on the size of the browser window.
- Front-end Q&A 871 2023-12-15 16:58:05
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- How to hide elements
- Methods to hide elements: 1. Use the display attribute of CSS; 2. Use the visibility attribute of CSS; 3. Use the opacity attribute of CSS; 4. Use the position attribute of CSS; 5. Use the overflow attribute of CSS; 5. Use the opacity attribute of CSS. overflow attribute; 6. Use the width and height attributes of CSS; 7. Use JavaScript. Different hiding methods will have different effects on the layout and style of the page.
- Front-end Q&A 1469 2023-12-15 16:53:17
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- What are the functions of the display attribute?
- The function of display attribute: 1. Define element type; 2. Control layout; 3. Control display; 4. Influence box model; 5. Implement responsive design; 6. Control element overlap; 7. Implement custom layout; 8. Control The order in which elements are displayed. Detailed introduction: 1. Define the element type, the display attribute can be used to define the type of the element; 2. Control the layout, by setting the display attribute, you can control the layout of the element; 3. Control the display, by setting the display attribute to none, you can control Whether the element is displayed, etc.
- Front-end Q&A 1057 2023-12-15 16:47:18
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- What are the instructions to prevent bubbling events?
- Instructions to prevent bubbling events: 1. stopPropagation(); 2. e.stopPropagation(); 3. return false; 4. Use the capture option in the parameters of addEventListener(). Detailed introduction: 1. stopPropagation() is a method in JavaScript that is used to prevent the bubbling delivery of events. When the event is triggered, the stopPropagation() method is called, etc.
- Front-end Q&A 1549 2023-12-15 15:40:57
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- What are pass by value and pass by reference
- Passing by value is to pass a copy of the parameter to the function, so the function receives a copy of the parameter value, not the parameter itself. Any modification to the parameter inside the function will only affect this copy and not the original variable. value. Pass by reference is to pass the address or reference of the parameter to the function. This means that the function receives a reference to the original data, not a copy of the data. Any modifications made to the parameters inside the function will directly affect the original data. These two delivery methods have their own applications, advantages and disadvantages in different programming languages and scenarios.
- Front-end Q&A 2385 2023-12-15 15:03:46
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- Why class selector cannot be used
- Reasons why the class selector cannot be used: 1. The class attribute is not declared correctly; 2. The class name is spelled incorrectly; 3. Grammar errors; 4. CSS rules are not imported correctly; 5. Browser compatibility issues. Detailed introduction: 1. The class attribute is not declared correctly. In HTML elements, the class attribute needs to be correctly declared to use the class selector; 2. The class name is spelled incorrectly. The class selector selects elements through the class name. If the class name is spelled If there is an error or a non-existent class name is used, the class selector cannot match the element; 3. Syntax errors, etc.
- Front-end Q&A 1113 2023-12-14 17:49:26
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- Why does localstorage fail so quickly?
- Reasons why localstorage fails quickly: 1. Browser support; 2. Storage space limit; 3. Security policy; 4. Page refresh and close; 5. JavaScript error. Detailed introduction: 1. Browser support. Different browsers may have different levels of support for LocalStorage. Some older browsers may not support LocalStorage, or there may be flaws in the implementation of LocalStorage, resulting in data failure; 2. Storage space limitations, etc. wait.
- Front-end Q&A 1060 2024-02-06 14:46:41
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- Why use localStorage
- Reasons for using localStorage: 1. Persistent data; 2. Support multiple data types; 3. Larger storage space; 4. Higher security; 5. Cross-domain access; 6. Convenient and fast. Detailed introduction: 1. Persistent data. The data in localStorage will not be lost due to page refresh or closing. It can store data persistently so that users can access these data between multiple browser sessions; 2. Support Multiple data types, unlike Cookies which can only store strings and so on.
- Front-end Q&A 1142 2023-12-14 14:42:48
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- What does localstorage store?
- LocalStorage can store multiple types of data, including strings, numbers, Boolean values, objects, arrays, etc. LocalStorage is a web storage mechanism that allows data to be stored in a user's browser that persists across the user's multiple browser sessions. Compared with Cookies, LocalStorage has larger storage space and longer validity period, so it is more suitable for storing large amounts of data or long-term data.
- Front-end Q&A 1461 2023-12-14 14:15:22
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- Why localstorage is not safe
- The reasons why localstorage is unsafe: 1. The stored content can be tampered with; 2. The data can be stolen; 3. The data can be forged; 4. Cross-site scripting attacks; 5. Clear browser data. Detailed introduction: 1. The stored content can be tampered with. The data in localStorage is stored in the user's browser, which means that anyone with access to the browser can view and modify the data in localStorage; 2. The data can be tampered with. is stolen because the data in localStorage is stored by the user and so on.
- Front-end Q&A 1600 2023-12-13 17:37:00
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- What are the forms of css selectors?
- The forms of CSS selectors are: 1. Element selector; 2. Class selector; 3. ID selector; 4. Attribute selector; 5. Pseudo-class and pseudo-element selectors; 6. Combination selector; 7. Attribute Selectors are used in conjunction with pseudo-classes/pseudo-elements. Detailed introduction: 1. Element selector is the most basic selector, which selects elements according to the type of HTML elements; 2. Class selector, which selects elements through the class attributes of HTML elements; 3. ID selector, The element is selected through the ID attribute of the HTML element; 4. Attribute selector, etc.
- Front-end Q&A 1056 2023-12-13 17:13:09
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- Why can't I open the file picker?
- Reasons for being unable to open the file selector: 1. Permission issues; 2. Wrong file path; 3. The file is occupied by other programs; 4. File system issues; 5. Application issues; 6. System settings issues. Detailed introduction: 1. Permission issue, the application or operating system may not have enough permissions to access the file picker; 2. File path error, if the wrong file path is entered, the file picker may not be able to find the file to open; 3 , the file is occupied by other programs, a file may be occupied by other programs, resulting in the inability to open, etc.
- Front-end Q&A 2354 2023-12-13 17:05:12
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- Why does the attribute selector not work?
- Reasons why the attribute selector is ineffective: 1. Selector syntax error; 2. Attribute value error; 3. Attribute does not exist; 4. CSS priority issue; 5. Browser compatibility issue; 6. Code error; 7. Cache question. Detailed introduction: 1. The selector syntax is wrong. The syntax of the attribute selector must be correct, otherwise it will not match the element correctly; 2. The attribute value is wrong. The attribute selector matches based on the attribute value. If the attribute value provided is incorrect , then the selector will not be able to match the target element; 3. The attribute does not exist, if the target element and so on.
- Front-end Q&A 1337 2023-12-13 17:00:10
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