add comments

src/components/State/Parent2/Child2/index.js

@@ -30,24 +30,7 @@ class Child2 extends Component {
     // })
   }
   render() {
-    return <div className={'p2-child'}>
-      Child2 ClassComponent
-      <p>
-        <button onClick={this.add}>+</button>
-        {this.state.count}
-      </p>
-      <div className={'sub-child-wrapper'}>
-        <SubChild1/>
-        <SubChild2/>
-      </div>
-      {
-        this.state.domList.map(item => {
-          return <div key={item}>
-            item
-          </div>
-        })
-      }
-    </div>
+    return <h1 onClick={this.add}>{this.state.count}</h1>
   }
 }
 

src/components/State/index.js

@@ -1,12 +1,12 @@
 import React from 'react'
 import Parent1 from './Parent1'
-import Parent2 from './Parent2'
+import Child2 from './Parent2/Child2'
 import './index.css'
 const State = () => {
   return <div className={'state-component'}>
     {/*<h2>State Change</h2>*/}
     {/*<Parent1/>*/}
-    <Parent2/>
+    <Child2/>
   </div>
 }
 

src/react/v16.13.1/react-reconciler/src/ReactFiberWorkLoop.new.js

@@ -1192,6 +1192,13 @@ export function discreteUpdates<A, B, C, D, R>(
   c: C,
   d: D,
 ): R {
+  /*
+  * fn: dispatchEvent
+  * a: 'click'
+  * b: 1
+  * c: App组件的原生DOM节点
+  * d: 事件对象
+  * */
   const prevExecutionContext = executionContext;
   executionContext |= DiscreteEventContext;
   try {