Vue——生命周期

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/vue/3.1.2/vue.global.js"></script>
 
</head>
<body>
 
<div id="app">
    <p ref="p1">{{num}}</p>
    <input type="text" v-model="num">
</div>
 
<script>
 
    vm = Vue.createApp({
        data() {
            return {
                num: 0,
            }
        },
        beforeCreate() {
            console.log("--------data数据被赋值到vm对象之前---------");
            console.log("this", this);
            console.log("num:", this.num);
            console.log("$el", this.$el);
        },
        created() { // 重点掌握，最常用，开发中一般会在这里编写ajax代码，发送http请求获取来自服务端的数据
            console.log("--------data数据被赋值到vm对象之后---------");
            console.log("this", this);
            console.log("num:", this.num);
            console.log("$el", this.$el);
            this.num = 10
        },
        beforeMount() {
            console.log("--------把data数据渲染到HTML模板之前---------");
            console.log("this", this);
            console.log("num:", this.num);
            console.log("$el", this.$el);
        },
        mounted() { // 重点掌握，最常用，开发中一般会在这里编写页面初始化的操作，一般就是根据条件/状态，进行页面跳转，改变页面的特效。
            console.log("--------把data数据渲染到HTML模板之后---------");
            console.log("this", this);
            console.log("num:", this.num);
            console.log("$el", this.$el.parentElement);
        },
        beforeUpdate() {
            console.log("--------data数据发生改变以后，同步到HTML模板之前，此时data和模板的数据是不一致的---------");
            console.log("this", this);
            console.log("num:", this.num);
            console.log("$el", this.$el.parentElement);
        },
        updated() {
            console.log("--------data数据发生改变以后，同步到HTML模板之后，此时data和模板中的数据保持一致---------");
            alert(123)
            console.log("this", this);
            console.log("num:", this.num);
            console.log("$el", this.$el.parentElement.innerHTML);
        }
 
    }).mount('#app')
</script>
 
</body>
</html>