SOURCE

> Uncaught ReferenceError: Vue is not defined

var vm = new Vue({
  el: '#app',
  data: {
    url: 'https://www.baidu.com/'
  },
  methods:{
    doSomething: function(){
      alert('doSomething')
    }
  }
})

<div id="app">
  <!-- v-bind用法 -->
  <!-- 完整语法 -->
  <a v-bind:href="url">1</a>
  <!-- 缩写 -->
  <br /><a :href="url">1</a>
  
  <!-- v-on用法 -->
  <!-- 完整语法 -->
  <br /><a v-on:click="doSomething">2</a>
  <!-- 缩写 -->
  <br /><a @click="doSomething">2</a>
</div>