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How do you dynamically load a JavaScript file?

How do you dynamically load a JavaScript file?

Create script elements and add them to the DOM to dynamically load JavaScript files; 2. Use Promise to encapsulation to achieve more concise asynchronous control; 3. Pay attention to execution order, CORS, security risks and duplicate loading issues; 4. You can record loaded scripts through Set to prevent duplicate loading. This method is suitable for lazy loading, third-party components or conditional functions, and it is necessary to ensure that the script source is trustworthy. Finally, the results are processed through onload or onerror callbacks. The entire process is automatically completed by the browser to download and execute the script.

Aug 02, 2025 am 10:17 AM
dynamic loading
How can you generate a random number in JavaScript?

How can you generate a random number in JavaScript?

To generate random numbers, use the Math.random() function; 1.Math.random() returns a floating point number between 0 (inclusive) and 1 (excluding); 2. To get random numbers in the specified range, use the formula Math.random()(max-min) min; 3. To get random integers, use Math.floor(Math.random()(max-min 1)) min; 4. To get the array random elements, use getRandomInt(0,array.length-1) as the index; 5. Security-sensitive scenarios should use crypto.getRandomValues() instead, because Math.r

Aug 02, 2025 am 10:04 AM
random number
How do you handle errors in JavaScript?

How do you handle errors in JavaScript?

Usetry...catchforsynchronouserrorslikeJSONparsingorundefinedpropertyaccesstopreventscriptcrashesandhandleissuesgracefully.2.Forasynchronousoperationssuchasfetch,usetry...catchwithasync/awaitor.catch()withPromises,alwayscheckingresponse.oksinceHTTPerr

Aug 02, 2025 am 09:51 AM
Error handling
Vite vs. Webpack: The Future of Frontend Tooling

Vite vs. Webpack: The Future of Frontend Tooling

Vite is the default choice for next-generation front-end build tools, and Webpack is still suitable for specific complex scenarios. 1. Vite is based on native ES modules to load on demand. The development server starts from 100ms to 500ms. The hot update is almost instant, and the experience is far beyond the Webpack that needs full packaging; 2. Webpack still has advantages in production and construction optimization, Loader/Plugin ecology, old browser compatibility, etc., which is suitable for old projects or highly customized needs; 3. Currently, mainstream frameworks generally recommend Vite, the ecosystem is mature, the configuration is simpler, and the learning cost is lower; 4. Future trends point to tool chains that are fast startup, fewer configurations, and modern browsers are preferred. Vite is in line with this direction. Therefore, new

Aug 02, 2025 am 09:47 AM
How to comment in JavaScript?

How to comment in JavaScript?

Use // to add single-line comments to briefly explain or disable single-line code; 2. Use /.../ to add multi-line comments to be suitable for detailed explanations or comments to blocks of code that contain multiple lines, including code that already contains //; both comments are ignored by JavaScript, but can improve code readability and maintainability.

Aug 02, 2025 am 09:11 AM
What is the bind method in JavaScript and how is it used?

What is the bind method in JavaScript and how is it used?

The bind method is used to create a new function whose this always points to the specified object. 1. It returns a new function that binds this and preset parameters through bind(thisArg,arg1,arg2,...); 2. It is often used to keep this pointing to the original object in event processing; 3. It can implement parameter pre-filling (partial applications); 4. Unlike call/apply, bind is not executed immediately, but returns a reusable function; 5. Ensure that this is correct when calling the method in an array method and other scenarios. This method is crucial when passing a callback, and although the arrow function has solved some of this problem, bind is still indispensable.

Aug 02, 2025 am 08:14 AM
bind方法
Micro Frontends Architecture: A Practical Implementation Guide

Micro Frontends Architecture: A Practical Implementation Guide

Microfrontendssolvescalingchallengesinlargeteamsbyenablingindependentdevelopmentanddeployment.1)Chooseanintegrationstrategy:useModuleFederationinWebpack5forruntimeloadingandtrueindependence,build-timeintegrationforsimplesetups,oriframes/webcomponents

Aug 02, 2025 am 08:01 AM
What are common security vulnerabilities in JavaScript and how can you prevent them?

What are common security vulnerabilities in JavaScript and how can you prevent them?

XSS can be prevented by input purification, output encoding, CSP policy and avoiding innerHTML; 2. CSRF can be defended by anti-CSRF tokens, SameSitecookies and verification request sources; 3. Unsecure dependencies need to be managed through regular updates, secure scanning tools and reducing the number of dependencies; 4. Client data leakage should be avoided by not storing keys on the front end and using back end processing sensitive logic; 5. Dynamic execution such as eval should be disabled, and use security alternatives instead; 6. Open redirection requires verification of URLs and whitelists; 7. Authentication sessions should use httpOnly, Secure, SameSiteCookies and use short life cycle tokens; the overall principle is to distrust users to input

Aug 02, 2025 am 03:49 AM
Security vulnerability
What is the difference between window and document in JavaScript?

What is the difference between window and document in JavaScript?

Thewindowobjectistheglobalbrowsercontextrepresentingthetaborwindow,containingpropertieslikelocation,history,andmethodslikealertandsetTimeout;2.Thedocumentobject,apropertyofwindow,representstheHTMLcontentandprovidesDOMaccessformanipulatingelements;3.K

Aug 02, 2025 am 03:06 AM
What is code splitting in JavaScript and how can it improve performance?

What is code splitting in JavaScript and how can it improve performance?

CodesplittingimprovesperformancebybreakinglargeJavaScriptbundlesintosmaller,on-demandchunks.1)Itenablesfasterinitialloadtimebydeliveringonlynecessarycode,reducingdownloadandparsingoverhead.2)Itreducesmemoryusagebyloadinglesscodeupfront,benefitinglow-

Aug 02, 2025 am 02:52 AM
code splitting
How can you check the data type of a variable in JavaScript?

How can you check the data type of a variable in JavaScript?

In JavaScript, the typeof operator can be used to check the data type of a variable, but it needs to be paid attention to its limitations. 1.typeof is suitable for basic types: typeof42 returns "number", typeof"hello" returns "string", typeoftrue returns "boolean", typeofundefined returns "undefined", typeofSymbol() returns "symbol", typeoffunction

Aug 02, 2025 am 02:31 AM
type of data
How do you handle events in JavaScript?

How do you handle events in JavaScript?

Use addEventListener() is a recommended method for handling events, supporting multiple listeners, separating code, and flexible functions; 2. Inline event handlers (such as onclick attributes) are not recommended because they are mixed with HTML and JavaScript, difficult to maintain, and only support a single handler; 3. Binding events through DOM element attributes (such as onclick) will overwrite existing handlers, and multiple responses cannot be added safely; 4. The event callback function receives event objects containing information such as type and target. Common event types include click, keydown, submit, change, load and mouseenter, etc.; 5. Event delegation is passed

Aug 02, 2025 am 02:30 AM
event handling
Creating Dynamic SVG with JavaScript

Creating Dynamic SVG with JavaScript

Use document.createElementNS() to create an SVG element and add it to the DOM; 2. Animate it through requestAnimationFrame and other methods; 3. Bind data to SVG to generate visual charts; 4. Add event listening to SVG elements to achieve interaction; 5. Dynamically update the properties of existing SVG elements to respond to data changes, and combine JavaScript to achieve fully controllable dynamic and interactive vector graphics. The key is to correctly use the SVG namespace and treat it as an ordinary DOM node for operation.

Aug 02, 2025 am 02:19 AM
How do you check if a string contains a substring in JavaScript?

How do you check if a string contains a substring in JavaScript?

Use include() method to directly judge whether a string contains a substring, return true or false, which is recommended for simple checking; 2. The indexOf() method returns the index value or -1, and needs to be used in conjunction with the use of not equal to -1; 3. The search() method supports regular expressions, suitable for scenarios that require regular matching, but only returns the first matching position; 4. The test() method is suitable for complex pattern matching, with high flexibility but too complex for simple requirements; in summary, for ordinary substring searches, include() is the clearest and efficient choice, and regular related methods are suitable for situations where pattern matching is required. In the end, it is recommended to use include() method to complete basic inclusion checks first.

Aug 02, 2025 am 02:09 AM
string

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