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​
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<div class="app">
  
  <div ref="msgDiv">{{msg}}</div>
​
  <div>msg1： {{msg1}} </div>
  <div>msg2： {{msg2}} </div>
  <div>msg3： {{msg3}} </div>
​
  
  <button @click="changeMsg">
    Change the Message
  </button>
  
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.0.3/vue.js"></script>
  <script>
  new Vue({
    el: '.app',
    data: {
      msg: 'Hello Vue.',
      msg1: '',
      msg2: '',
      msg3: ''
    },
    methods: {
      changeMsg() {
        
        this.msg = "Hello world."
        console.log('1. 改變 data.msg = ' + this.msg)
​
        this.msg1 = this.$refs.msgDiv.innerHTML
        console.log('2. data.msg1 取 DOM 內容 = '+ this.msg1)
        
        // $nextTick：在修改數據後，會再次調用的 function
        this.$nextTick(() => {
          this.msg2 = this.$refs.msgDiv.innerHTML
          console.log('3. data.msg2 $nextTick 取 DOM 內容 = '+ this.msg2)
        })
        
        this.msg3 = this.$refs.msgDiv.innerHTML
        console.log('4. data.msg3 取 DOM 內容 = ' + this.msg3)
        // 再次取得 $refs.msgDiv.
      }
    }
  })
  </script>
</div>
</body>
</html>
 
​
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