<div id="test">  <select v-model="A">  <option v-for="yx in YX">    {{yx.text}}  </option></select><select name="ZY">  <option v-for="zy in {{ selection }}">    {{zy.text}}  </option></select></div><script>new Vue({  el:'#test',  data:{    YX:[      {        text:'計信院',        ZY:[          {text:'軟件工程'},          {text:'計算機科學與技術'},          {text:"信息安全"},        ]      },      {         text:'商學院',        ZY:[          {text:'旅游管理'},          {text:'工商管理'},          {text:"行政管理"},        ]      },        ]  },  computed:{    selection: {      get: function() {        var obj;        var ZY = eval(this.YX)        for(obj in ZY)        {          if(A == obj.text)            B = obj.ZY        }        return B      }    }  }});</script>