Choose link or import: study their differences and commonalities

Explore the similarities and differences between link and import: Which should you choose?

When writing code, we often need to introduce functions, variables, etc. defined in other modules or files. There are many different ways to achieve this in different programming languages. In this article, we'll explore two common methods in JavaScript: link and import. We will discuss the characteristics and usage of these two methods in detail and give suggestions suitable for different situations.

1. link (link)

In HTML, we can use the link tag to link to external CSS style sheets. We can introduce external CSS files by adding the tag at the head of the HTML file. For example:

<link rel="stylesheet" href="styles.css">

In this example, we are linking a CSS file called styles.css into our HTML file. In this way, we can beautify our web pages by defining styles in CSS files. But the link tag can be used not only to introduce CSS files, but also to introduce other types of files, such as JavaScript files.

<link rel="stylesheet" href="styles.css">

By using the link tag, we can link external files into our HTML files so that they can be loaded and used in the browser.

2. import (import)

In JavaScript, we can use the import statement to introduce functions, variables, etc. defined in other modules or files. The import statement is a new feature introduced in ES6.

For example, we can define a function in a JavaScript file and then use it in another file:

// utils.js 文件
export function add(a, b) {
  return a + b;
}

// main.js 文件
import { add } from './utils.js';
console.log(add(1, 2)); // 输出: 3

By using the import statement, we can introduce one file into another file function or variable defined in . This makes our code more modular and organizeable. Especially useful in larger projects.

3. Comparison of similarities and differences

Now let’s compare the similarities and differences between link and import.

Same points:

• can be used to introduce external files or modules.
• You can use functions, variables, etc. defined in external files or modules in the main file.

Differences:

• link is an HTML tag used to introduce external files into HTML files, suitable for introducing CSS, icons, HTML modules, etc.; while import is Statements used to introduce other modules or files into JavaScript files, suitable for introducing JavaScript modules.
• link is used in HTML files and involves the browser's rendering and loading process, while import is used in JavaScript files and involves the loading and execution of JS modules.
• link can be used anywhere in the HTML file, while import must be used in the top-level scope of JavaScript.

4. Choose the appropriate method

Between selecting link and import, we should decide which method to use based on specific needs.

If we need to introduce external CSS, icons, HTML modules, etc., or need to use external files in different locations of HTML, then using link is the most appropriate choice.

If we need to introduce functions, variables, etc. defined in other JavaScript modules or files, or need to modularize the code to make the project easier to maintain and expand, then using import is the best choice.

In short, we need to choose link and import according to specific needs so that we can better organize and manage our projects when writing code. This way, our code will be clearer, maintainable, and easier to collaborate on.

In actual development, link and import are often used at the same time to meet different needs. Proper use of link and import can improve our development efficiency and code quality, and better complete our work.

Through this article, we have explored and compared link and import. We hope that readers can use it flexibly in practice and choose the method that suits their own projects.

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