An extremely simple requirejs implementation method
I have written about the source code analysis of require and sea in my previous blog. What I want to share today is a very simple core code (about 60 lines without comments and blank lines), without fault tolerance judgment.
require.js
require function implementation can be summarized in one sentence:
Load the require modules in sequence, then monitor the onload event of the script, determine that all modules are loaded successfully, and execute the require callback. If there is only one parameter and it is not an array, It is to return the module after loading successfully.
//标记已经加载成功的个数 var REQ_TOTAL = 0; //模块导出 window.exports = {}; //记录各个模块的顺序 var exp_arr = []; //判断是否数组 function isArray(param) { return param instanceof Array; } //require 真正实现 function require(arr, callback) { var req_list; if(isArray(arr)) { req_list = arr; } else { req_list = [arr]; } var req_len = req_list.length; //模块逐个加载 for(var i=0;i<req_len;i++) { var req_item = req_list[i]; var $script = createScript(req_item, i); var $node = document.querySelector('head'); (function($script) { //检测script 的onload事件 $script.onload = function() { REQ_TOTAL++; var script_index = $script.getAttribute('index'); exp_arr[script_index] = exports; window.exports = {}; //所有链接加载成功后,执行callback if(REQ_TOTAL == req_len) { callback && callback.apply(exports, exp_arr); } } $node.appendChild($script); })($script); } } //创建一个script标签 function createScript(src, index) { var $script = document.createElement('script'); $script.setAttribute('src', src); $script.setAttribute('index', index); return $script; }
Then I wrote 2 js files for the export module, and only wrote the simplest exports implementation
define.js
exports.define = { topic: 'my export', desc: 'this is other way to define ', sayHello: function() { console.log('topic ' + this.topic + this.desc); } }
define2.js
exports.define = { name: 'xm', age: 22, info: function() { console.log('topic ' + this.name + this.age); } }
Then test The demo is very simple
//测试demo require(['../res/define.js', '../res/define2.js'], function(def, def2) { def.define.sayHello(); def2.define.info(); });

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Detailed explanation of JavaScript string replacement method and FAQ This article will explore two ways to replace string characters in JavaScript: internal JavaScript code and internal HTML for web pages. Replace string inside JavaScript code The most direct way is to use the replace() method: str = str.replace("find","replace"); This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g: str = str.replace(/fi

Simple JavaScript functions are used to check if a date is valid. function isValidDate(s) { var bits = s.split('/'); var d = new Date(bits[2] '/' bits[1] '/' bits[0]); return !!(d && (d.getMonth() 1) == bits[1] && d.getDate() == Number(bits[0])); } //test var

This article discusses how to use jQuery to obtain and set the inner margin and margin values of DOM elements, especially the specific locations of the outer margin and inner margins of the element. While it is possible to set the inner and outer margins of an element using CSS, getting accurate values can be tricky. // set up $("div.header").css("margin","10px"); $("div.header").css("padding","10px"); You might think this code is

This article explores ten exceptional jQuery tabs and accordions. The key difference between tabs and accordions lies in how their content panels are displayed and hidden. Let's delve into these ten examples. Related articles: 10 jQuery Tab Plugins

Discover ten exceptional jQuery plugins to elevate your website's dynamism and visual appeal! This curated collection offers diverse functionalities, from image animation to interactive galleries. Let's explore these powerful tools: Related Posts: 1

http-console is a Node module that gives you a command-line interface for executing HTTP commands. It’s great for debugging and seeing exactly what is going on with your HTTP requests, regardless of whether they’re made against a web server, web serv

This tutorial shows you how to integrate a custom Google Search API into your blog or website, offering a more refined search experience than standard WordPress theme search functions. It's surprisingly easy! You'll be able to restrict searches to y

The following jQuery code snippet can be used to add scrollbars when the div content exceeds the container element area. (No demonstration, please copy it directly to Firebug) //D = document //W = window //$ = jQuery var contentArea = $(this), wintop = contentArea.scrollTop(), docheight = $(D).height(), winheight = $(W).height(), divheight = $('#c
