020:尚硅谷watch监视情况4学习示例

src/components/Person.vue

@@ -1,10 +1,16 @@
 <template>
 <div class="person">
-    <h2>姓名:{{ person.name }}</h2>
-    <h2>年龄: {{ person.age  }}</h2>
-    <button @click="changeName">Add Sun</button>
-    <button @click="changePerson">Change Person</button>
-    
+<h1>情况4示例</h1>
+<h2>姓名：{{ person.name }}</h2>
+<h2>年龄：{{ person.age }}</h2>
+<h2>汽车：{{ person.car.c1 }}---{{ person.car.c2 }} </h2>
+<button @click="changeName">更改姓名</button>
+<button @click="changeAge">更改年龄</button>
+<button @click="changeCarc1">更改汽车品牌1</button>
+<button @click="changeCarc2">更改汽车品牌2</button>
+<button @click="changeCar">更改所有汽车</button>
+
+
     
 </div>
 
@@ -13,19 +19,42 @@
     <script setup lang="ts">
 
     import { reactive, watch } from 'vue'
-    let person = reactive({name: 'John', age: 30})
-    function changeName(){
-        person.name += '~'
-        person.age += 100
-        console.log(person.name);
-    }
-    function changePerson(){
-        Object.assign(person, {name: 'Mary', age: 20})
-    }
-    watch(person, (newValue, oldValue) => {
-        console.log('person的值发生了变化', newValue, oldValue);
-       
+    let person = reactive({
+        name: 'John',
+        age: 25,
+        car: {
+            c1: '奔驰',
+            c2: '宝马'
+        }
+
     })
+
+    function changeName(){
+        person.name += 'Jane'
+    }
+    function changeAge(){
+        person.age += 30
+
+    }
+    function changeCarc1(){
+        person.car.c1 = '大众'
+        
+    }
+    function changeCarc2(){
+        person.car.c2 = '奥迪'
+    }
+    function changeCar(){
+        person.car = {
+            c1: '保时捷',
+            c2: '法拉利'
+        }
+    }
+    watch(()=>person.age, (newValue, oldValue) => {
+        console.log('person changed:', newValue, oldValue)
+    })
+    watch(()=>person.car, (newValue, oldValue) => {
+        console.log('汽车变化了:', newValue, oldValue)
+    },{deep:true})
    
 
     </script>