Web Developer 面试题与答案

问题 21. What is the significance of the 'viewport' meta tag in HTML?

The 'viewport' meta tag controls the layout and scaling of the webpage on mobile devices, ensuring proper rendering on various screen sizes.

Example:

问题 22. What are RESTful APIs, and how do they work?

RESTful APIs (Representational State Transfer) are web APIs that adhere to the principles of REST, utilizing standard HTTP methods for communication.

问题 23. What is the purpose of the 'defer' attribute in a script tag?

The 'defer' attribute delays the execution of a script until the HTML parsing is complete.

Example:

问题 24. Explain the concept of 'hoisting' in JavaScript.

Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their containing scope during the compilation phase.

Example:

console.log(x); // undefined
var x = 5;

问题 25. How can you optimize the performance of a website?

Performance optimization techniques include minimizing HTTP requests, using asynchronous loading, optimizing images, and employing caching strategies.