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Article Introduction：HTML5's FileAPI realizes local file processing through the following steps: 1. Obtain files: Use and FileList objects to obtain the file selected by the user; 2. Preview pictures: Preview before upload through the readAsDataURL method of FileReader; 3. Multi-file control: Use multiple and accept attributes to limit the file type and number, and traverse and verify in JS; 4. Upload files: Use FormData to wrap data and send it to the server through fetch or XMLHttpRequest. The backend needs to support multipart/form-data format. The entire process includes four key links: acquisition, preview, restriction and upload.

2025-07-13 comment 0  303

Article Introduction：To successfully publish products on the Xiaohongshu platform, image quality and size information are crucial. This article will explain in detail Xiaohongshu product image specifications and product size setting techniques to help you increase product exposure and conversion rate. 1. Xiaohongshu product image specifications In order to ensure the clarity and authenticity of product images, Xiaohongshu has the following requirements for product images: High-definition and true: The images must clearly and truly reflect the appearance and color of the product, avoiding blur and distortion. Size ratio: It is recommended to use a 1:1 square image with a minimum side length of no less than 480 pixels to facilitate better display on the user's homepage. Quantity limit: You can upload up to 9 pictures for each product. It is recommended to display it from multiple angles, including front, side, back and detailed close-ups. Pure content: Pictures

2025-01-16 comment 0  708

Article Introduction：To build a web page, you need to master the HTML foundation. First, HTML is the core language for building web pages, and you can quickly get started with zero foundation; secondly, HTML pages are composed of basic structures, including declarations, root elements, meta information and titles, and content areas; then, commonly used tags such as title-, paragraphs, links, pictures, unordered lists and ordered lists can help organize content; in addition, the page can be simply beautified by inline style attributes, such as setting the font color and background color; finally, save it as a .html file and open it in a browser to test and view it, and refresh it after modification. Hands-on practice is the key to mastering HTML.

2025-07-20 comment 0  694

Article Introduction：The Nginx server log records various client request information. This article will introduce in detail the common request types and related information in the Nginx log. 1. HTTP request method Nginx log records a variety of HTTP request methods, which are used to indicate the way clients interact with the server: GET: the most commonly used request method, which is used to obtain data from the server, such as web pages, pictures, CSS files, etc. Request parameters are usually included in the URL. POST: is used to submit data to the server, often used for form submission or file upload. Data is contained in the request body, not the URL. PUT: Used to upload files or update existing resources on the server. The data is also located in the request body. DEL

2025-04-13 comment 0  652

Article Introduction：Dynamic web crawling can be achieved through an analysis interface or a simulated browser. 1. Use browser developer tools to view XHR/Fetch requests in the Network, find the interface that returns JSON data, and use requests to get it; 2. If the page is rendered by the front-end framework and has no independent interface, you can start the browser with Selenium and wait for the elements to be loaded and extracted; 3. In the face of the anti-crawling mechanism, headers should be added, frequency control, proxy IP should be used, and verification codes or JS rendering detection should be carried out according to the situation. Mastering these methods can effectively deal with most dynamic web crawling scenarios.

2025-07-10 comment 0  434

Article Introduction：SqlParameter Parameters.Add vs. AddWithValue: Choosing the Best MethodWhen working with SQL commands, you may encounter the need to add...

2025-01-10 comment 0  679

Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w

2025-01-10 comment 0  826

Article Introduction：Conditional Column CountingConsider a table named "Jobs" structured as follows:jobId, jobName, Prioritywhere "Priority" is an integer between 1...

2025-01-10 comment 0  834

Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI What is the Interview Questions CLI? The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview

2025-01-10 comment 0  1450

Article Introduction：Improved Methods for Trimming Leading Zeros in SQL ServerThe conventional approach for trimming leading zeros in SQL Server involves employing the...

2025-01-10 comment 0  664

Article Introduction：ShouldSerialize() vs Specified Conditional Serialization PatternConditional serialization is crucial to selectively control serialization...

2025-01-10 comment 0  1446

Article Introduction：Recursive Query Resulting in Recursion Depth Limit ExceededThis query faced a recurring error due to exceeding the maximum recursion limit of 100....

2025-01-10 comment 0  1269

Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...

2025-01-10 comment 0  1058

Article Introduction：JavaScriptSerializer.Deserialize: Mapping Field Names in JSON to .Net Object PropertiesQuestion:How can you map a field name in JSON data to a...

2025-01-10 comment 0  502

Article Introduction：Rotating an Image in WinFormsThis question addresses the need to rotate an image within a Windows Forms application, particularly for indicating...

2025-01-10 comment 0  1220

Article Introduction：Database Table Update: Aligning Columns with Referenced ValuesYour question pertains to updating a database table where the QuestionID column...

2025-01-10 comment 0  811

Article Introduction：Conditional Serialization Patterns: ShouldSerialize() vs. SpecifiedIntroductionXmlSerializer offers two patterns for conditionally serializing...

2025-01-10 comment 0  677

Article Introduction：Soft Deletes: A Boon or a Bane?The question of soft deletes, an alternative to permanent data deletion, has elicited diverse opinions within the...

2025-01-10 comment 0  656

Article Introduction：There are a lot of crafting stations that you can make in Terraria. This ranges from simple anvils to unique stations meant for one specific type of resource. Early into the game, you'll be able to make your own Loom, which is primarily used to make

2025-01-10 comment 0  1334

Article Introduction：Printing VARCHAR(MAX) using Print StatementYou have a code that involves fetching a VARCHAR(MAX) value (@Script) and then printing it using two...

2025-01-10 comment 0  1318