<div id="demo">
 
 <h2 class="title">自定义下拉框</h2>
 <imitate-select h2-value="第一个 Select" v-bind:list="list1"></imitate-select>
 
 <h2 class="title">自定义下拉框</h2>
 <imitate-select h2-value="第二个 Select" v-bind:list="list2"></imitate-select>
 
</div>

<script>
 // 注册组件【 全局 】
 Vue.component('imitate-select', {
  data: function(){ // 给每一个添加一个自己的对象
   return {
    selectShoe: false,
    val: ''
   }
  },
  props: ['h2Value', 'list'], // 这里的名称一定是驼峰式【如：上面是 h2-value（上面可以是烤串或驼峰式） ，下面必须是 h2Value】
  template: `<section class="main">
      <div class="select">
       <h2 class="fuzhi">{{ h2Value }}</h2>
       <div class="select_header">
        <input type="text" class="select_input" placeholder="模仿Select下拉框" @click="selectShoe = !selectShoe" :value="val" ><i></i>
       </div>
       <select-list v-show="selectShoe" :list="list" @receive="changeHandle"></select-list>
      </div>
     </section>`,
  methods: {
   changeHandle(value){ // 自定义事件
    // alert('我被触发了！值为：' + value)
    this.val = value
   }
  }
 });
 
 Vue.component('select-list', {
  props: ['list'],
  template: `<ul class="select_list">
      <li v-for="item of list" @click="selectHandle(item)">{{ item }}</li>
     </ul>`,
  methods: {
   selectHandle: function (item){
    this.$emit('receive', item)
   }
  }
 });
 
 new Vue({
  el: '#demo',
  data: {
   list1: ['HTML','CSS','Javascript','Vue.js'],
   list2: ['PHP','JAVA','C++','.NET']
  }
 })
</script>