国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

current location：Home > Technical Articles > Daily Programming

  • PHP header location vs javascript redirect
    PHP header location vs javascript redirect
    The jump mechanism of PHP ("Location:...") and JavaScript are different from the applicable scenarios. 1. The execution time is different: PHP is a server-side jump, and the browser jumps immediately after receiving the response, and does not depend on whether JS is enabled; JS is a browser-side jump, and the page is executed after the page is loaded, and it will be invalid if JS is disabled. 2. SEO friendly: PHP is more suitable for SEO, supports 301/302 status code, which is conducive to search engine recognition; JS is not friendly enough to crawlers. 3. Interactiveness: JS is more flexible and suitable for jumping based on user behavior or conditions. 4. Security and limitations: PHP uses header()
    PHP Tutorial . Backend Development 813 2025-07-12 00:23:11
  • PHP hide undefined index notice
    PHP hide undefined index notice
    When encountering the "undefinedindex" problem, you should give priority to using isset() to determine whether the index exists. 1. Using isset() can effectively avoid notice and apply to all arrays; 2. Array_key_exists() can distinguish whether the index exists and whether the value is null; 3. The empty merge operator?? (PHP7) can set the default value concisely and safely; 4. Resist error information is feasible but not conducive to maintenance. It is recommended to select isset(), array_key_exists() or ?? operators according to the scene to improve the robustness of the code.
    PHP Tutorial . Backend Development 747 2025-07-12 00:20:01
  • Implementing Responsive Images with the HTML srcset and sizes Attributes
    Implementing Responsive Images with the HTML srcset and sizes Attributes
    srcset and sizes are key properties for HTML implementation of responsive images. srcset provides multiple image sources and their width or pixel density, such as 400w and 800w, and the browser selects the appropriate image accordingly; sizes defines the display width of the image under different screen widths, such as (max-width: 600px)100vw, 50vw, so that the browser can more accurately match the image size. In actual use, you need to prepare multi-size pictures, clearly named, design layout in accordance with media query, and test the performance of the equipment to avoid ignoring sizes or unit errors, thereby saving bandwidth and improving performance.
    HTML Tutorial . Web Front-end 839 2025-07-12 00:15:11
  • What is the difference between an element, a tag, and an attribute?
    What is the difference between an element, a tag, and an attribute?
    InHTML,elements,tags,andattributesaredistinctbutrelatedconcepts.1.Anelementisthecompletestructure,consistingofanopeningtag,content,andaclosingtag,suchasThisisaparagraph..2.Tagsaretheactualcodeusedtodefineelements,includingopeningtagslikeandclosingtag
    HTML Tutorial . Web Front-end 633 2025-07-12 00:11:21
  • What is the value attribute for a list item () in an ordered list?
    What is the value attribute for a list item () in an ordered list?
    The labels in ordered list() use the value attribute to customize the number of list items. 1. By default, the browser automatically numberes according to the location; 2. Use value to override this behavior, which is suitable for list paging, dynamic content or scenes where fixed numbers are required; 3. Once the value of an item is set, subsequent items will be incremented based on this value; 4. The value must be a positive integer, which is only valid in it, does not affect the style, and compatibility should be tested with caution.
    HTML Tutorial . Web Front-end 782 2025-07-12 00:05:12
  • PHP function return type declarations
    PHP function return type declarations
    PHP function return type declarations can improve code clarity and robustness, especially for large projects and multi-person collaboration. By directly adding colons and types (such as :int and :string) after the function definition, the function can be forced to return data of the specified type. If the return value type does not match, an error will be thrown during runtime. Supported types include basic types, arrays, objects, callable objects and union types starting from PHP8 (such as: int|float). For cases where null may be returned, a ? prefix is ??available, such as:?string. The return type declaration itself does not need to enable strict_types to take effect, but it is recommended to enable strict mode in a unified way to maintain the consistent code style. Best practices include trying to identify the return type,
    PHP Tutorial . Backend Development 273 2025-07-12 00:04:41
  • Embedding Images Using the HTML img Tag
    Embedding Images Using the HTML img Tag
    When embedding images with HTML tags, you need to pay attention to path settings, alt descriptions and responsive processing. 1. The path settings must be accurate, distinguishing between relative paths, subdirectory paths and absolute URLs; 2. Clear and concise alt alternative text must be filled in to improve accessibility and SEO; 3. It is recommended to use CSS to control width and height to avoid layout jitter, and you can also set width or height to achieve similar scaling; 4. Optional properties such as loading="lazy" delay loading, decoding="async" asynchronous decoding, and srcset multi-resolution adaptation can improve performance and responsive effects.
    HTML Tutorial . Web Front-end 149 2025-07-12 00:04:12
  • Implementing a dark mode theme with CSS
    Implementing a dark mode theme with CSS
    The core of implementing dark mode is to use CSS variables to manage colors and cooperate with the theme switching mechanism. First, by defining CSS variables, the color value can be managed uniformly, so that the entire site can be effective if one modification is made; second, use class name switching to realize manual mode, and control the addition or removal of classes through JavaScript; third, automatically identify system preferences in combination with media queries; finally, the adaptation of pictures and third-party content needs to be handled, such as using filters to adjust brightness contrast to ensure overall visual coordination.
    CSS Tutorial . Web Front-end 332 2025-07-11 03:27:11
  • Styling visited links differently with CSS
    Styling visited links differently with CSS
    Setting the style of links you have visited can improve the user experience, especially in content-intensive websites to help users navigate better. 1. Use CSS's: visited pseudo-class to define the style of the visited link, such as color changes; 2. Note that the browser only allows modification of some attributes due to privacy restrictions; 3. The color selection should be coordinated with the overall style to avoid abruptness; 4. The mobile terminal may not display this effect, and it is recommended to combine it with other visual prompts such as icon auxiliary logos.
    CSS Tutorial . Web Front-end 522 2025-07-11 03:26:21
  • How to style SVG elements CSS tutorial
    How to style SVG elements CSS tutorial
    SVG elements can be styled through CSS, but attention should be paid to their unique properties and rules. 2. You can use inline styles or blocks to set SVG-specific properties such as fill and stroke, but common abbreviation properties such as border are not applicable. 3. The inline style has higher priority, and external CSS needs to be added!important to cover it. 4. SVG needs to be embedded in the DOM (such as inline or through tags) to accept external CSS influence. 5. Use class and ID to easily control the graphics grouping and achieve interactive effects such as hover. 6. Pay attention to the priorities of selectors, style inheritance and unit writing differences. 7. In terms of animation, transform and opacity perform the most
    CSS Tutorial . Web Front-end 470 2025-07-11 03:26:01
  • What is the difference between display: inline, display: block, and display: inline-block?
    What is the difference between display: inline, display: block, and display: inline-block?
    Themaindifferencesbetweendisplay:inline,block,andinline-blockinHTML/CSSarelayoutbehavior,spaceusage,andstylingcontrol.1.Inlineelementsflowwithtext,don’tstartonnewlines,ignorewidth/height,andonlyapplyhorizontalpadding/margins—idealforinlinetextstyling
    CSS Tutorial . Web Front-end 297 2025-07-11 03:25:00
  • How to center a div or image in HTML
    How to center a div or image in HTML
    To center the div or image, it can be achieved through various CSS methods. 1. Use margin:0auto to horizontally center block-level elements with fixed width; 2. Flexbox layout can achieve horizontal and vertical centering at the same time by setting the parent container display:flex, justify-content:center and align-items:center; 3. Use display:grid and place-items:center to complete centering at the same time; 4. For pictures, you can also use text-align:center to center the picture horizontally in the parent container. Different methods have different application scenarios, and you need to choose a matching solution according to your needs.
    HTML Tutorial . Web Front-end 274 2025-07-11 03:23:12
  • How can JavaScript interact with CSS Custom Properties?
    How can JavaScript interact with CSS Custom Properties?
    JavaScript can directly manipulate CSS custom properties (CSS variables), get variable values ??through getComputedStyle() and getPropertyValue(), and update variable values ??using setProperty(). The specific steps are as follows: 1. Use getComputedStyle(element).getPropertyValue('--variable-name') to get the variable value. Note that you need to use trim() to remove spaces on the result; 2. Use element.style.setProperty('--variable-name','new-v
    CSS Tutorial . Web Front-end 283 2025-07-11 03:22:51
  • How to select an element that does not have a specific class using the :not() pseudo-class?
    How to select an element that does not have a specific class using the :not() pseudo-class?
    In CSS, use the :not() pseudo-class to select elements that do not contain specific class names. Its basic usage is: not(.class-name), for example, p:not(.highlight) will select all paragraphs without .highlight class and apply styles; if multiple classes need to be excluded, it should be written as continuous: not() conditions, such as p:not(.a): not(.b); application scenarios include setting the default style uniformly and excluding special items, form control style processing, etc.; at the same time, it should be noted that valid selectors must be used in not(), and pseudo-elements or invalid syntax cannot be nested, otherwise the entire expression will be invalid.
    CSS Tutorial . Web Front-end 844 2025-07-11 03:22:20

Tool Recommendations

jQuery enterprise message form contact code

jQuery enterprise message form contact code is a simple and practical enterprise message form and contact us introduction page code.
form button
2024-02-29

HTML5 MP3 music box playback effects

HTML5 MP3 music box playback special effect is an mp3 music player based on HTML5 css3 to create cute music box emoticons and click the switch button.

HTML5 cool particle animation navigation menu special effects

HTML5 cool particle animation navigation menu special effect is a special effect that changes color when the navigation menu is hovered by the mouse.
Menu navigation
2024-02-29

jQuery visual form drag and drop editing code

jQuery visual form drag and drop editing code is a visual form based on jQuery and bootstrap framework.
form button
2024-02-29

Organic fruit and vegetable supplier web template Bootstrap5

An organic fruit and vegetable supplier web template-Bootstrap5
Bootstrap template
2023-02-03

Bootstrap3 multifunctional data information background management responsive web page template-Novus

Bootstrap3 multifunctional data information background management responsive web page template-Novus
backend template
2023-02-02

Real estate resource service platform web page template Bootstrap5

Real estate resource service platform web page template Bootstrap5
Bootstrap template
2023-02-02

Simple resume information web template Bootstrap4

Simple resume information web template Bootstrap4
Bootstrap template
2023-02-02

Cute summer elements vector material (EPS PNG)

This is a cute summer element vector material, including the sun, sun hat, coconut tree, bikini, airplane, watermelon, ice cream, ice cream, cold drink, swimming ring, flip-flops, pineapple, conch, shell, starfish, crab, Lemons, sunscreen, sunglasses, etc., the materials are provided in EPS and PNG formats, including JPG previews.
PNG material
2024-05-09

Four red 2023 graduation badges vector material (AI EPS PNG)

This is a red 2023 graduation badge vector material, four in total, available in AI, EPS and PNG formats, including JPG preview.
PNG material
2024-02-29

Singing bird and cart filled with flowers design spring banner vector material (AI EPS)

This is a spring banner vector material designed with singing birds and a cart full of flowers. It is available in AI and EPS formats, including JPG preview.
banner picture
2024-02-29

Golden graduation cap vector material (EPS PNG)

This is a golden graduation cap vector material, available in EPS and PNG formats, including JPG preview.
PNG material
2024-02-27

Home Decor Cleaning and Repair Service Company Website Template

Home Decoration Cleaning and Maintenance Service Company Website Template is a website template download suitable for promotional websites that provide home decoration, cleaning, maintenance and other service organizations. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-05-09

Fresh color personal resume guide page template

Fresh color matching personal job application resume guide page template is a personal job search resume work display guide page web template download suitable for fresh color matching style. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-29

Designer Creative Job Resume Web Template

Designer Creative Job Resume Web Template is a downloadable web template for personal job resume display suitable for various designer positions. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28

Modern engineering construction company website template

The modern engineering and construction company website template is a downloadable website template suitable for promotion of the engineering and construction service industry. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28