xxx

basic/7/index.html

@@ -0,0 +1,41 @@
+<!--
+ * @Author: chenxuan
+ * @Date: 2022-01-15 19:51:19
+ * @LastEditTime: 2022-01-15 19:56:39
+ * @LastEditors: chenxuan
+-->
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document</title>
+</head>
+<body>
+    <div id="app"></div>
+	<script src="../package/old/react.development.js"></script>
+    <script src="../package/old/react-dom.development.js"></script>
+    <script src="../package/old/babel.min.js"></script>
+    <script type="text/babel">
+    	class Time extends React.Component{
+            state={date:new Date()}
+            render(){
+                return (
+                    <div>
+                        <h1>hello!</h1>
+                        <input type="text"/>
+                        <span>现在是：{this.state.date.toTimeString()}</span>
+                    </div>
+                )
+            }
+            componentDidMount(){
+                setInterval(()=>{
+                    this.setState({date:new Date()})
+                },1000)
+            }
+        }
+        ReactDOM.render(<Time/>,document.getElementById('app'))
+    </script>
+</body>
+</html>

basic/7/read.text

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+1、diffing算法
+2、循环时key的作用
+   在更像时起着重要作用
+3、index作为key的问题   
+   造成不必要的更新，资源浪费
+   含有输入框的节点可能会导致错乱