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响应式原理
2021-05-20 12:09:55 +0800
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响应式原理

官方响应式原理图

核心函数说明

手写源码，函数模块调用流程图

observe

  • 在对象上添加__ob__属性，这个属性指向一个Observer侦测对象

Observer

  • 侦测类，作用是将对象的每一层转为响应式
  • dep类的实例在此类中实例化，用来收集依赖Watcher的实例

defineReactive

  • 两个核心getter和setter
  • 在getter中收集依赖（主要看Dep.target是否不为空，不为空就说明目前有依赖，多个依赖竞争Dep.target）
  • 在setter中触发依赖

parsePath

  • 将字符串路径，例如'a.b.c.d'，转为能够在原对象上读取此路径对应的值的函数

array

  • 改写Array.prototype上的七个函数，让它们变为响应式

改写流程图

  • 在arrayMethods定义七个一模一样的api，并重写覆盖Array.prototype上的这七个api。再将数组实例的原型设置为arrayMethods

github源码地址

手写数据响应式原理

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