生命周期钩子函数

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <span id="num">{{num}}</span>
        <button @click="num++">赞!</button>
        <h2>{{name}},有{{num}}个人点赞</h2>
    </div>

    <script src="../node_modules/vue/dist/vue.js"></script>
    
    <script>
        let app = new Vue({
            el: "#app",
            data: {
                name: "张三",
                num: 100
            },
            methods: {
                show() {
                    return this.name;
                },
                add() {
                    this.num++;
                }
            },
            beforeCreate() {
                console.log("=========beforeCreate=============");
                console.log("数据模型未加载:" + this.name, this.num);
                console.log("方法未加载:" + this.show());
                console.log("html模板未加载:" + document.getElementById("num"));
            },
            created: function () {
                console.log("=========created=============");
                console.log("数据模型已加载:" + this.name, this.num);
                console.log("方法已加载:" + this.show());
                console.log("html模板已加载:" + document.getElementById("num"));
                console.log("html模板未渲染:" + document.getElementById("num").innerText);
            },
            beforeMount() {
                console.log("=========beforeMount=============");
                console.log("html模板未渲染:" + document.getElementById("num").innerText);
            },
            mounted() {
                console.log("=========mounted=============");
                console.log("html模板已渲染:" + document.getElementById("num").innerText);
            },
            beforeUpdate() {
                console.log("=========beforeUpdate=============");
                console.log("数据模型已更新:" + this.num);
                console.log("html模板未更新:" + document.getElementById("num").innerText);
            },
            updated() {
                console.log("=========updated=============");
                console.log("数据模型已更新:" + this.num);
                console.log("html模板已更新:" + document.getElementById("num").innerText);
            }
        });
    </script>
</body>

</html>

  

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