实现AMD规范

废话不说，直接上代码：

//由于require依赖程序时要取模块依赖，所以所有的依赖应该有一个共同的载体，也就是对象，可以通过对象访问到这些依赖
let factories = {

}


function define(mod, dependences, factory){
	factory.dependences = dependences;
	factories[mod] = factory;

}

function require(mods, callback){
	let result = mods.map(function(mod){
		let factory = factories[mod];
		let dependences = factory.dependences;
		let exports;
		//当依赖又有其他依赖时，递归调用require
		require(dependences, function(){
			exports = factory.apply(null, arguments)
		})

		return exports
	})

	callback.apply(null, result)
}


define('name', ['tel'], function(tel){
	return '珠峰'+tel
})

define('age', [], function(){
	return 9
})

define('tel', [], function(){
	return '13698563957'
})


require(['name','age'], function(name, age){
   console.log(name,age)
})