
require.config({
		paths:{
			jquery: "lib/jquery-1.8.0",
			underscore:"lib/underscore",
			backbone:"lib/backbone",
			todo: "models/todo",
			todo_view: "views/todo_view"
		},
		// 依存関係、外部に出す変数を設定する
		//exportsはnode.jsのmodule.exportsと同じ考え.
		shim:{
			// "backbone" refer to paths["backbone"]
			"backbone":{
				// set dependency module.
				deps:["underscore","jquery"],
				// It's same as exports = Backbone
				exports: "Backbone"
			},
			// exports _.
			"underscore":{
				exports: "_"
			}
		}
});

<!doctype html>
<html>
	<head>
		<meta charset="utf-8">
		<script data-main="app/config" src="app/lib/require.js"></script>
		<script>
			// call main.js.
			require(["main"]);
		</script>
		</meta>
	</head>
	<body>
	</body>
</html>

main.js

define(["jquery","underscore","backbone"],function($,_,Backbone){

	// write some great code!


});