Interview Questions Compilation and Classification

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Interview
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1. Coding and Algorithms 🔗︎

  • Advantages, Disadvantages, and Applicability of BOM Headers:
    • Advantages: Clearly defines file encoding to prevent character encoding issues.
    • Disadvantages: May cause compatibility issues in certain scenarios.
    • Applicability: Suitable for scenarios requiring explicit encoding specifications.

Algorithm Questions 🔗︎

  • A specific algorithm question (not specified).

2. HTTP and HTTPS 🔗︎

HTTP and HTTPS Handshake Process 🔗︎

  • HTTP: Uses plaintext transmission, with a simple but insecure handshake process.
  • HTTPS: Uses SSL/TLS encryption, with a handshake process that includes certificate verification, key exchange, and other steps.

Features of HTTP/2 🔗︎

  • Multiplexing:
    • Allows multiple requests and responses to be transmitted simultaneously over a single connection.
    • Reduces latency and improves performance.
  • Header compression: Reduces the transmission of redundant header information.
  • Server push: Actively pushes resources to the client.

3. Front-end Security and Performance 🔗︎

Security Understanding 🔗︎

  • Common Frontend Security Issues:
    • XSS (Cross-Site Scripting), CSRF (Cross-Site Request Forgery), etc.
  • Preventive Measures:
    • Input validation, CSP (Content Security Policy), HttpOnly Cookies, etc.

Performance Optimization 🔗︎

  • Why Optimize: Improve user experience and reduce resource consumption.
  • How to optimize:
    • Resource compression, lazy loading, CDN acceleration, code splitting, etc.
  • How to evaluate:
    • Use tools (such as Lighthouse, WebPageTest) to analyze metrics such as first screen load time and interaction time.
  • Further optimization options:
    • Image optimization (such as WebP format), reducing repaints and reflows, etc.

4. Front-end error collection 🔗︎

Error logging 🔗︎

  • How to log:
    • Use window.onerror or try-catch to capture global errors.
  • Distinguishing third-party plugin issues:
    • Use stack information to locate the source of the error.
  • Reporting method:
    • Asynchronously send error logs to the server.
  • Analysis methods:
    • Cluster error types to identify high-frequency issues.

5. Mobile and PC Development 🔗︎

PC and Mobile Conversion 🔗︎

  • Adaptation solutions:
    • Responsive layout, media queries, REM/VW units, etc.
  • Common ES6 features:
    • Destructuring assignment, arrow functions, template strings, Promises, etc.
  • Array Methods Overview:
    • map, filter, reduce, forEach, some, every, etc.

6. Team Collaboration and Technical Knowledge Accumulation 🔗︎

Current Team Status 🔗︎

  • Frontend Knowledge Accumulation:
    • Development of technical documentation, component libraries, and toolchains.
  • Technical Research:
    • Exploration and implementation of new technologies (such as mini-programs and micro-frontends).
  • Purpose:
    • Improve team efficiency and reduce the learning curve for new members.

Frontend Code Review Rules 🔗︎

  • Example Rules:
    • Prohibit the use of var and enforce the use of const/let.
    • Component names must comply with specifications.
  • Reason for Establishment:
    • Improve code readability and maintainability.

Interface Specifications 🔗︎

  • Return Code Specifications:
    • Success (200), failure (400/500), etc.
  • Negotiation method:
    • Develop interface documentation in collaboration with the backend team.
  • New employee training:
    • Provide detailed documentation and sample code.

7. Mini Programs and MVVM 🔗︎

Mini Program Research 🔗︎

  • Why do it:
    • The mini program ecosystem is becoming increasingly important, so it is necessary to plan ahead.
  • Is it simple?:
    • It appears simple on the surface, but issues such as performance optimization and compatibility still require in-depth research.

MVVM Pattern 🔗︎

  • Definition:
    • Model-View-ViewModel, data-driven view updates.
  • Advantages and Disadvantages:
    • Advantages: Decouples the view from the logic, making maintenance easier.
    • Disadvantages: May cause performance issues in complex scenarios.

8. Login Functionality Implementation 🔗︎

Remember Login Functionality 🔗︎

  • Implementation Method:
    • Use localStorage or cookie to store user identifiers.
  • Security:
    • Encrypt sensitive information before storage.

Unified Login and Authorized Login 🔗︎

  • Considerations:
    • User experience, security, integration with third-party platforms.

9. Project Experience 🔗︎

Campus and Work Projects 🔗︎

  • Campus Projects:
    • Describe the most representative projects and their highlights.
  • Work Projects:
    • Describe the most challenging projects and their solutions.

Team Learning and Roles 🔗︎

  • Problem-Solving Approach:
    • Analyze the root cause of the problem and draw on team experience.
  • Lessons Learned:
    • Technical or managerial insights gained from team members.
  • Team Roles:
    • Developer, Technical Lead, etc.

10. Data Analysis System 🔗︎

Functional Breakdown 🔗︎

  • Requirement Understanding:
    • Clarify the objectives and user requirements of data analysis.
  • Technical Implementation:
    • Data visualization, chart libraries (e.g., ECharts), frontend-backend separation architecture.

11. Business Direction and Job Grade System 🔗︎

Business Direction 🔗︎

  • Past Business Capabilities:
    • Describe the businesses you have participated in and their results.
  • Desired Direction:
    • Describe the business areas you wish to pursue (e.g., big data, AI, etc.).

Job Grade System 🔗︎

  • Department Characteristics:
    • Describe the department’s core business and technology stack.

12. Team Collaboration and Project Management 🔗︎

Team Member Distribution 🔗︎

  • Role Responsibilities:
    • Frontend, backend, testing, product manager, etc.
  • Version Iteration:
    • Agile development process with regular version releases.

Project Delay Handling 🔗︎

  • Response Measures:
    • Priority adjustments, overtime work, and communication coordination.

13. Other Department Business 🔗︎

Cross-Department Collaboration 🔗︎

  • Other Department Operations:
    • Describe the operational characteristics of other teams within the company.

14. Front-End Optimization and Debugging 🔗︎

requestAnimationFrame vs setTimeout 🔗︎

  • Why use requestAnimationFrame:
    • More efficient, synchronized with screen refresh rate, suitable for animation scenarios.

First-Screen Optimization 🔗︎

  • Alternatives to SSR:
    • Skeleton screens, lazy loading, on-demand loading, etc.

Frontend Standard Implementation 🔗︎

  • Issues and Solutions:
    • Difficulty in promoting standards and insufficient enforcement; use tools (such as ESLint) for automated checks.

15. Source Code and Webpack Optimization 🔗︎

Source Code Reading 🔗︎

  • React Virtual DOM Optimization:
    • Tree comparison algorithms, Diff optimization.
  • Performance Changes in New React Versions:
    • Concurrent Mode, Suspense, etc.

Webpack Optimization 🔗︎

  • Challenges:
    • Large bundle size, slow build speed.
  • Optimization Methods:
    • Tree Shaking, code splitting, caching mechanisms.

16. Debugging and Sourcemap 🔗︎

Sourcemap 🔗︎

  • Definition:
    • Maps compiled code back to source code for easier debugging.
  • Use Cases:
    • Error tracking in production environments.