vue3中的shallowReactive和shallowRef

14_src_shallowRef和shallowReactive/App.vue

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+<template>
+  <!--vue3的组件模版结构可以没有根标签-->
+  <button @click="isShowDemo = !isShowDemo">{{ isShowDemo ? '隐藏' : '显示'}}</button>
+  <Demo v-if="isShowDemo"/>
+</template>
+
+<script>
+import Demo from "./components/Demo";
+import { ref } from "vue";
+export default {
+  name: 'App',
+  components: {Demo},
+  setup(){
+    let isShowDemo = ref(true);
+    return {
+      isShowDemo
+    }
+  }
+}
+</script>
+
+<style>
+#app {
+  font-family: Avenir, Helvetica, Arial, sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  text-align: center;
+  color: #2c3e50;
+  margin-top: 60px;
+}
+</style>

14_src_shallowRef和shallowReactive/components/Demo.vue

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+<template>
+  <h2>当前的y是:{{ x.y }}</h2>
+  <button @click="x = {y : 888}">点我替换x</button>
+  <button @click="x.y++">点我y+1</button>
+  <hr/>
+  <h4>{{ person }}</h4>
+  <h2>姓名:{{ name }}</h2>
+  <h2>年龄:{{ age }}</h2>
+  <h2>薪资:{{ job.j1.salary }}K</h2>
+  <button @click="name = name + '~'">修改姓名</button>
+  <button @click="age++">增长年龄</button>
+  <button @click="job.j1.salary++">增长薪资</button>
+</template>
+
+<script>
+import {ref,reactive, toRefs, shallowReactive, shallowRef} from 'vue';
+export default {
+  name: 'Demo',
+  setup(){
+    //shallowReactive只考虑对象类型的第一层数据响应式
+    // let person = shallowReactive({
+    //   name: '张三',
+    //   age: 18,
+    //   job:{
+    //     j1:{
+    //       salary: 20
+    //     }
+    //   }
+    // });
+
+    let person = reactive({
+      name: '张三',
+      age: 18,
+      job:{
+        j1:{
+          salary: 20
+        }
+      }
+    });
+
+    // let x = ref(0);
+
+    //传递基本类型来说,ref与shallowRef基本是没什么区别的
+    // let x = shallowRef(0);
+    //但注意对象类型shallowRef不去处理，而ref底层回去借助reactive生成proxy对象(getter/setter)
+    //但注意不管是shallowR还是非shallow, 第一层都是响应式的(不如下面的x依然是响应式数据)
+    let x = shallowRef({ y: 0 });
+
+    console.log(x);
+
+    // let x = ref({ y: 0 })
+
+    return {
+      person,
+      ...toRefs(person),
+      x,
+    };
+
+  }
+}
+</script>
+
+<style>
+</style>
+

14_src_shallowRef和shallowReactive/main.js

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+//引入不再是Vue构造函数了，引入的是一个名为createApp的工厂函数
+//注意在这里无法像vue2那样去书写了，(这里并不兼容)
+import { createApp } from 'vue'
+import App from './App.vue'
+
+//创建应用实例对象---app类似于vue2中vm,但app比vm更轻
+const app = createApp(App);
+// console.log(app);
+//挂载
+app.mount('#app');
+
+// setTimeout(() => {
+//     app.unmount("#app");
+// },2000)
+
+// //vue2写法
+// const vm = new Vue({
+//     render: h=> h(App)
+// });
+// vm.$mount('#app')