require.js遵循AMD规范，通过define定义模块，require异步加载模块,一个js文件即一个模块。
一、模块加载require
1.加载符合AMD规范模块
HTML:
<script src="js/require.js" data-main="js/main"></script>
MAIN.JS
require.config({
baseUrl: "js/lib",
paths: {
"jquery": "jquery.min"
}
});
require(['jquery'], function ($){ // some code here });
2.加载不符合AMD规范模块
require.config({ shim: { 'underscore':{ exports: '_' }, 'backbone': { deps: ['underscore', 'jquery'], exports: 'Backbone' } } });
二、模块定义define
define(['math', 'graph'], function ( math, graph ) { return { plot: function(x, y){ return graph.drawPie(math.randomGrid(x,y)); } } }; );
三、require+jquery+domready
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script src="js/require.js"></script> </head> <body> <div id="333">123124</div> <script> require.config({ paths: {"jquery": "js/lib/jquery-1.11.1.min", "domReady": "js/lib/domReady" } }); require(["domReady!", "jquery"], function() { //alert('22') change(); }); function change(){ $('#333').text('5555'); } </script> </body> </html>
原文地址：
http://javascript.ruanyifeng.com/tool/requirejs.html
http://www.ruanyifeng.com/blog/2012/11/require_js.html