Frontend Developer 面试题与答案

问题 6. What is the purpose of the 'webpack' module bundler in frontend development?

'Webpack' is a module bundler that takes assets, such as JavaScript, CSS, and images, and transforms them into a format that can be efficiently served to the browser. It also enables code splitting and other optimizations.

问题 7. Explain the concept of 'event bubbling' in JavaScript.

'Event bubbling' is the process where the event starts from the target element and bubbles up the DOM hierarchy until it reaches the root. It allows for delegating event handling to a common ancestor.

问题 8. What is the purpose of the 'transition' property in CSS?

The 'transition' property in CSS is used to create smooth transitions between property values over a specified duration. It is commonly used for animations and effects.

Example:

```css
/* Example of using transition */
.element {
  transition: width 0.5s ease-in-out;
}
```

问题 9. Explain the concept of 'polyfill' in web development.

A 'polyfill' is a piece of code (usually JavaScript) that provides modern functionality on older browsers that do not support that feature. It 'fills in' the gaps to ensure compatibility.

问题 10. What is the role of the 'viewport' meta tag in HTML?

The 'viewport' meta tag in HTML is used to control the layout viewport of the browser, ensuring that the webpage is displayed correctly on various devices by setting the initial scale, width, and zoom level.

Example:

```html

```