How to use include in js

There is no built-in include function in JavaScript, but similar functionality can be achieved by using an external script tag. Take advantage of dynamically created \ elements. Adopt the modular nature of JavaScript.

include usage in JavaScript

In JavaScript, there is no standard include function. However, there are several ways to achieve similar functionality:

Method 1: Use an external script tag

<code class="html"><script src="path/to/external-script.js"></script></code>

Adding this tag to an HTML document will load the external JavaScript file and execute its contents.

Method 2: Using a dynamically created <script> element

<code class="js">// 创建一个新的 <script> 元素
var script = document.createElement('script');

// 设置源属性
script.src = "path/to/external-script.js";

// 添加脚本到文档头
document.head.appendChild(script);</code>

This will dynamically create and load the script at runtime.

Method 3: Use JavaScript modules

Modules were introduced in ES6, which is a mechanism for encapsulating and reusing code. Modules can import and export each other's content. To import a module, you can use the following syntax:

<code class="js">import {name} from "module-name";</code>

Example:

<code class="js">// 定义一个模块
export function myFunction() {
  console.log("Hello world!");
}</code>

<code class="js">// 导入模块
import {myFunction} from "./module-name";

// 调用模块中的函数
myFunction(); // 输出 "Hello world!"</code>

These methods allow you to include external scripts and modules in JavaScript, enabling code reuse and modules change.

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