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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.0.3/vue.js"></script>
<body>
  <div id="app">
  <h1>{{ count }}</h1>
  <button @click="updateEvent">Update</button>
</div>
<button id="del">Del</button>
</body>
</html>
 
var vm = new Vue({
    el: '#app',
    data: {
      count: 0,
    },
    methods: {
      updateEvent: function () {
        this.count += 1;
      },
    },
    beforeCreate: function () {
      // 元件實體剛被建立,屬性計算之前。(取不到實體中的data)
      console.log('beforeCreate - this.count: ', this.count);
      console.log('beforeCreate - this.$el: ', this.$el);  //$el指的html中的dom,也就是html 21行到24行這部分
    },
//     created: function () {
//       // 元件實體已建立,屬性已綁定,但 DOM 還沒生成。
//       console.log('created - this.count: ', this.count);  //可以取得實體資料
//       console.log('created - this.$el: ', this.$el);
//     },
//     beforeMount: function () {
//       // 模板 (template) 編譯或掛載至 HTML 之前
//       console.log('beforeMount - this.$el: ', this.$el);
//     },
//     mounted: function () {
//       // 模板 (template) 編譯或掛載至 HTML 之後
//       console.log('mounted - this.$el: ', this.$el);
//     },
//     beforeUpdate: function () {
//       // 元件被更新之前
//       console.log('beforeUpdate: ', 
//       this.$el.querySelector('h1').innerText, //這邊就是取得html 21行的h1
//       this.count);
//     },
//     updated: function () {
//       // 元件被更新之後
//       console.log('updated: ', 
//       this.$el.querySelector('h1').innerText, 
//       this.count);
//     },
//     beforeDestroy: function () {
//       // 移除 vue instance 之前
//       console.log('beforeDestroy');
//     },
//     destroyed: function () {
//       // 移除 vue instance 之後
//       console.log('destroyed');
//     },
  });
  document.getElementById('del').addEventListener('click', function () {
    vm.$destroy(); //vm指的是new Instance(vue實體)
  });
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