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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 id="app">
​
    <h4>Watch</h4>
    <p>使用 trigger 來觸發三秒後旋轉 box、並在三秒後改變回來</p>
    <div class="box" :class="{'rotate': trigger }"></div>
    <hr>
    <button class="btn btn-outline-primary" @click="openTrigger">Counter</button>
  </div>
  
  
  <!-- development version, includes helpful console warnings -->
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
​
</body>
</html>
 
var app = new Vue({
  el: '#app',
  data: {
    trigger: false,
  },
  methods: {
    openTrigger: function() {
      var vm = this;
      vm.trigger = true
    },
    closeTrigger: function() {
      var vm = this;
      setTimeout(function() { 
        vm.trigger = false
      }, 3000);
    }
  },
  watch: {
    // 監聽 trigger 這個變數是否有變化
    trigger: function() {
      this.closeTrigger();
    }
  },
​
});
Output

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