- Vue 首次渲染的过程。
- 先初始化Vue的实例成员和静态方法
- 调用构造函数，根据模板或用户自己写的render函数生成渲染函数
- 调用beforeMount钩子函数
- 根据渲染函数生成虚拟DOM,再将虚拟DOM转换成真实DOM，挂载到页面上
- 创建Watcher对象，收集依赖，以便将来数据改变时更新视图
- 调用Mounted钩子函数，初始化结束
- Vue 响应式原理
- 通过Object.defineProperty 和 ES6 的 Proxy 对对象类型的数据进行数据劫持，监听数据的变化
- 在getter函数中收集依赖
- 通过发布订阅模式在数据改变，调用setter时，更新视图
- 虚拟 DOM 中 Key 的作用和好处
- 作用：标记Vnode，结合tagName用来判断新旧节点是否是同一节点
- 好处：当更改视图相关数据时，最小化更新视图，性能更好
- Vue 中模板编译的过程
- 将模板字符串转换成AST抽象语法树
- 对AST进行静态节点标记，在后续转化过程中提供优化
- 通过 generate 将 AST 抽象语法树转换为 render 函数的 js 字符串
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