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RequireJS 简单实现

RequireJS 基本实现原理如下

  1. 紧紧盯住require函数中依赖的模块状态，只有当这些依赖模块状态都为loaded则可以进行回调函数的执行
  2. 当然require函数中的依赖模块本身可能也依赖其他模块，那么这就是一个递归的过程，不断下钻去加载依赖模块的依赖模块，直到找到最简单的模块（没有任何依赖的模块），这样看起来就是一个依赖树，最简单模块就是树的叶子节点，那么它的状态必然是loaded
  3. 当每次脚本加载成功之后我们就进行全局检查，检查当前脚本模块的父亲节点的状态是否是loaded，若不是则检查父亲节点的依赖模块是否全部为loaded，若都为loaded那么父亲节点的状态就可以更新为loaded，我们按照此方法递归检查父亲的父亲节点
  4. 检查到最后，直到根节点状态为loaded，那么依赖模块就全部加载完毕了

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