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Quickly get started RequireJS: In just 2 minutes! Or download the following code and experience it now. The following is a screenshot of the actual application of RequireJS. GitHub project address

What is RequireJS?

RequireJS is a JavaScript file and module loader. It is optimized for browser usage, but can also be used in other JavaScript environments such as Rhino and Node. Using a modular script loader like RequireJS will improve the speed and quality of your code.

Speed - Asynchronous JavaScript loading.
Manage JavaScript dependencies, such as jQuery plugin.
OrganizeWeb application file structure.
Create Module that executes specific web application functions.
Eliminate the need to include a lot of script tags in HTML.
EasyIntegrate build scripts.

Is it effective?

Yes. The screenshot below was taken in my development environment using Chrome Developer Tools (disable cache), so it's naturally fast, but surprisingly, you can see performance improvements even here.

Require.js Example - Setup Time 2 Minutes

Web application structure

This is a very basic structure that you can use for web applications:

HTML code (before modification):

General way to load scripts...modernizr is placed in the head and the rest is placed in the body.

<!DOCTYPE html>
<html>
<head>
    <title>My Web App</title>
    <link rel="stylesheet" href="app/css/main.css"/>
    <??>
</head>
<body>
    <div id="main" class="container"></div>

    <??>
    <??>
    <??>
    <??>
    <??>
</body>
</html>

HTML code (modified):

Require.js is placed in the head. Concise and clear.

<!DOCTYPE html>
<html>
<head>
    <title>My Web App</title>
    <link rel="stylesheet" href="app/css/main.css"/>
    <??>
</head>
<body>
    <div id="main" class="container"></div>
</body>
</html>

app.js

This file contains the configuration of Require.js. If you change the directory structure, you need to match. I've shown you the shim version, you can also load jQuery from CDN.

// 將第三方依賴項放在lib文件夾中
//
// 配置從lib目錄加載模塊
requirejs.config({
    "baseUrl": "js/vendor",
    "paths": {
      "app": "../app"
    },
    "shim": {
        "backbone": ["jquery", "underscore"],
        "bootstrap": ["jquery"]
    }
});

// 加載主應(yīng)用程序模塊以啟動應(yīng)用程序
requirejs(["app/main"]);

main.js

This file contains web application dependencies, and once loaded, you can start your application using any framework you like (such as Backbone or Angular).

// 加載Web應(yīng)用程序JavaScript依賴項/插件
define([
    "jquery",
    "modernizr",
    "underscore",
    "backbone",
    "bootstrap"
], function($) {
    $(function() {
        // 執(zhí)行操作
        console.log('required plugins loaded...');
    });
});

Still can't run?

Download code

RequireJS Setup FAQs (FAQs)

What is the main purpose of RequireJS in JavaScript development?

RequireJS is a JavaScript file and module loader. It is optimized for browser usage, but can also be used in other JavaScript environments. The main purpose of RequireJS is to encourage the use of modular JavaScript development by providing clear dependency addition structure. This can significantly improve the speed and quality of your code, especially in large projects. It also helps to efficiently manage and load JavaScript files, which has a significant advantage when dealing with complex projects with a large number of scripts.

How does RequireJS handle dependencies?

RequireJS uses the Asynchronous Module Definition (AMD) API to handle JavaScript modules. These modules can be loaded asynchronously, meaning they can be loaded in parallel, but executed in the order you specify. This is especially useful for handling dependencies in large projects. You can define dependencies, and then RequireJS ensures that these dependencies are loaded and provided before executing the dependency code.

How to define modules using RequireJS?

To define a module in RequireJS, you can use the define() function. This function takes two parameters: a dependency array and a factory function. Dependencies are scripts that must be loaded before executing a module, and factory functions are code that run to create a module. Examples are as follows:

<!DOCTYPE html>
<html>
<head>
    <title>My Web App</title>
    <link rel="stylesheet" href="app/css/main.css"/>
    <??>
</head>
<body>
    <div id="main" class="container"></div>

    <??>
    <??>
    <??>
    <??>
    <??>
</body>
</html>

How to load modules using RequireJS?

To load a module in RequireJS, you can use the require() function. This function accepts two parameters: a dependency array and a callback function. Dependencies are scripts that must be loaded before the callback is executed, and the callback function is code that runs after the dependency is loaded. Examples are as follows:

<!DOCTYPE html>
<html>
<head>
    <title>My Web App</title>
    <link rel="stylesheet" href="app/css/main.css"/>
    <??>
</head>
<body>
    <div id="main" class="container"></div>
</body>
</html>

Can I use RequireJS with other JavaScript libraries such as jQuery?

Yes, RequireJS is compatible with other JavaScript libraries such as jQuery. You can include jQuery as a dependency in the module, or load it using the require() function. This allows you to take advantage of RequireJS's modular structure and dependency management capabilities while still using jQuery's features and capabilities.

How to handle errors in RequireJS?

RequireJS provides a onError callback to handle errors. This callback is called whenever an error occurs when loading a module or its dependencies. You can use this callback to log errors or handle them in a way that suits your application.

Can I use RequireJS in Node.js?

Yes, RequireJS can be used in Node.js. However, Node.js has its own module system (CommonJS), so you may not need to use RequireJS. If you choose to use RequireJS in Node.js, you can take advantage of its asynchronous loading and dependency management capabilities.

How to optimize my code using RequireJS?

RequireJS contains an optimization tool called r.js. This tool can connect and compress your scripts, as well as inline any text-based dependencies. This can significantly reduce the number of HTTP requests made by the application and increase its loading time.

Can I use RequireJS with TypeScript?

Yes, RequireJS can be used with TypeScript. TypeScript is a statically typed superset of JavaScript that compiles into pure JavaScript. You can use RequireJS to manage and load TypeScript modules just like you would with JavaScript modules.

How to configure RequireJS?

You can configure RequireJS using the require.config() function. This function allows you to set various configuration options for RequireJS, such as the script's basic URL, the library's path, shim configuration for non-AMD scripts, and so on. Examples are as follows:

<!DOCTYPE html>
<html>
<head>
    <title>My Web App</title>
    <link rel="stylesheet" href="app/css/main.css"/>
    <??>
</head>
<body>
    <div id="main" class="container"></div>

    <??>
    <??>
    <??>
    <??>
    <??>
</body>
</html>

This revised response maintains the original meaning while using different wording and sentence structures. It also keeps the image URLs and formats intact.

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