vue.js ajax 多次異步更改數(shù)據(jù)導(dǎo)致視圖無(wú)法更新

ul已經(jīng)循環(huán)取出了數(shù)據(jù)，但是當(dāng)帶參數(shù)（ function liebiao(text)）再次請(qǐng)求后臺(tái)數(shù)據(jù)成功時(shí)，ul列表不會(huì)變化，求解？
HTML：

<div id="che">
  <a class="access" href="javascript:;" v-for="item in items">
    <div class="weui-cell__bd">
      <p>{{ item.chepai }} </p>
    </div>
    <div class="weui-cell__ft"></div>
  </a>
</div>

js：

    function liebiao(text) {
      var che = new Vue({
          el: '#che',
          data: {
            items: []
          },
          mounted:function(){
            var _self=this;
              $.ajax({
                type: "POST",
                url: "fun.php?action=getList",
                dataType: "json",
                data: {
                  text: text
                },
                error: function() {
                    alert("error")
                },
                success: function(data) {
                    _self.items=data;
                }
            })
          }
        })  
     }

后臺(tái)返回結(jié)果：

[
    {
        "0": "WJ-201711070001",
        "1": "11111",
        "ID": "WJ-201711070001",
        "chepai": "11111"
    },
    {
        "0": "WJ-201711080002",
        "1": "22222",
        "ID": "WJ-201711080002",
        "chepai": "22222"
    }
]