Vue.js（4）- 生命周期

当new的时候，就创建了一个vue实例，这个实例就是vue框架的入口，也是VM层
<!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>
  <script src="./vue-2.5.16.js"></script>
</head>

<body>
  <div id="app">
    <input type="text" v-model="message">
    <h2>{{message}}</h2>
  </div>
  <script>
    var vm = new Vue({
      el: "#app",
      data: {
        message: 'my words'
      },
      beforeCreate() {
        console.group("beforeCreate");
        console.log("%c%s", "color:red", "el     : " + this.$el); 
        console.log("%c%s", "color:red", "data   : " + this.$data);  
        console.log("%c%s", "color:red", "message: " + this.message)
      },
      created() {
        console.group("created");
        console.log("%c%s", "color:red", "el     : " + this.$el); 
        console.log("%c%s", "color:red", "data   : " + this.$data);  
        console.log("%c%s", "color:red", "message: " + this.message)
      },
      beforeMount() {
        console.group("beforeMount");
        console.log("%c%s", "color:red", "el     : " + this.$el); 
        console.log("%c%s", "color:red", "data   : " + this.$data);  
        console.log("%c%s", "color:red", "message: " + this.message)
      },
      mounted() {
        console.group("mounted");
        console.log("%c%s", "color:red", "el     : " + this.$el); 
        console.log("%c%s", "color:red", "data   : " + this.$data);  
        console.log("%c%s", "color:red", "message: " + this.message)
      },
      beforeUpdate() {
        console.group("beforeUpdate");
        console.log("%c%s", "color:red", "el     : " + this.$el); 
        console.log("%c%s", "color:red", "data   : " + this.$data);  
        console.log("%c%s", "color:red", "message: " + this.message)
      },
      updated() {
        console.group("updated");
        console.log("%c%s", "color:red", "el     : " + this.$el); 
        console.log("%c%s", "color:red", "data   : " + this.$data);  
        console.log("%c%s", "color:red", "message: " + this.message)
      },
      beforeDestroy() {
        console.group("beforeDestroy");
        console.log("%c%s", "color:red", "el     : " + this.$el); 
        console.log("%c%s", "color:red", "data   : " + this.$data);  
        console.log("%c%s", "color:red", "message: " + this.message)
      },
      destroyed() {
        console.group("destroyed");
        console.log("%c%s", "color:red", "el     : " + this.$el); 
        console.log("%c%s", "color:red", "data   : " + this.$data);  
        console.log("%c%s", "color:red", "message: " + this.message)
      },
    })
  </script>
</body>

</html>