The essential JS roundup for debugging code in Chrome DevTools

This article aims to solve the problem of deep URL refresh or direct access causing page resource loading failure when deploying single page applications (SPAs) on Vercel. The core is to understand the difference between Vercel's routing rewriting mechanism and browser parsing relative paths. By configuring vercel.json to redirect all paths to index.html, and correct the reference method of static resources in HTML, change the relative path to absolute path, ensuring that the application can correctly load all resources under any URL.

This tutorial aims to solve the problem of loading assets (CSS, JS, images, etc.) when accessing multi-level URLs (such as /projects/home) when deploying single page applications (SPAs) on Vercel. The core lies in understanding the difference between Vercel's routing rewriting mechanism and relative/absolute paths in HTML. By correctly configuring vercel.json, ensure that all non-file requests are redirected to index.html and correcting asset references in HTML as absolute paths, thereby achieving stable operation of SPA at any depth URL.

In JavaScript, the most common method to add elements to the beginning of an array is to use the unshift() method; 1. Using unshift() will directly modify the original array, you can add one or more elements to return the new length of the added array; 2. If you do not want to modify the original array, it is recommended to use the extension operator (such as [newElement,...arr]) to create a new array; 3. You can also use the concat() method to combine the new element array with the original number, return the new array without changing the original array; in summary, use unshift() when modifying the original array, and recommend the extension operator when keeping the original array unchanged.

Qwikachievesinstantloadingbydefaultthroughresumability,nothydration:1)TheserverrendersHTMLwithserializedstateandpre-mappedeventlisteners;2)Norehydrationisneeded,enablingimmediateinteractivity;3)JavaScriptloadson-demand,onlywhenuserinteractionoccurs;4

Usetheloading="lazy"attributefornativelazyloadinginmodernbrowserswithoutJavaScript.2.Formorecontrolorolderbrowsersupport,implementlazyloadingwiththeIntersectionObserverAPIbysettingdata-srcfortheactualimageURLandusingaplaceholderinsrc.3.Obse

This article explores in-depth security vulnerabilities in custom JavaScript XSS defense functions, especially incomplete character escape and easy bypass to keyword-based filtering. By analyzing an example function, it reveals the risks of unprocessed keyword characters such as quotes and backquotes, and how code obfuscation techniques circumvent simple keyword detection. The article emphasizes the importance of context-sensitive escape and recommends the adoption of mature libraries and multi-layer defense strategies to build more robust security protection.

ToaccessandmodifyHTMLelementsusingJavaScript,firstselecttheelementusingmethodslikedocument.getElementById,document.querySelector,ordocument.querySelectorAll,thenalteritscontent,attributes,orstyles;forexample,useelement.textContentforsafetextupdates,e

This tutorial introduces in detail how to use JavaScript to implement multi-condition dynamic filtering function, allowing users to filter products based on multiple attributes such as color and size. Through clear HTML structure and JavaScript code examples, the article demonstrates how to flexibly handle AND and OR logic to meet complex user filtering needs and provides optimization suggestions.