SOURCE

new Vue ({
  el:"#app",
  data : {
    sss : '',
    checked : '',
    select : ''
  },
  methods: {
    checked : function () {
       if(checked) 
          alert("s");
    }
  }
})

<div id="app">
  <div v-bind:style="{'width':'200px','height':sss+'px','background':select}">111</div>
  <span>高度:{{sss}}</span>
  <textarea name="" v-model="sss" id="" cols="30" rows="10"></textarea>
  <!-- 输入框 -->
  <input type="checkbox" id="checkbox" v-model="checked">
  <span>{{checked}}</span>
 <!--  下拉列表 -->
  <select name="" id="" v-model="select" >
    <option v-model="">red</option>
    <option v-model="">blue</option>
  </select>
</div>