解决vue 更改计算属性后select选中值不更改的问题

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先上代码：

复制代码

//...
<body>
  <div id="qwe">
    <select v-model="selected">
      <option v-for="item in da" :value="item.value">{{item.value}}</option>
    </select>
    <span>{{selected}}</span>
  </div>
  <script>
    var dt = [{
      value: '111',
      label: 'aaa'
    }, {
      value: '222',
      label: 'bbb'
    }, {
      value: '333',
      label: 'ccc'
    }, {
      value: '444',
      label: 'ddd'
    }, {
      value: '555',
      label: 'fff'
    }];
    var vm = new Vue({
      el: '#qwe',
      data: {
        options: [{
          value: '选项1',
          label: '黄金糕'
        }, {
          value: '选项2',
          label: '双皮奶'
        }, {
          value: '选项3',
          label: '蚵仔煎'
        }, {
          value: '选项4',
          label: '龙须面'
        }, {
          value: '选项5',
          label: '北京烤鸭'
        }],
        selected: ''
      },
      computed: {
        da: function () {
          var _self = this;
          return _self.options.filter(function (item) {
            return +item.value.split('')[2] > 2;
          });
        }
      }
    })
  </script>
</body>
</html>

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//...
<body>
  <div id="qwe">
    <select v-model="selected">
      <option v-for="item in da" :value="item.value">{{item.value}}</option>
    </select>
    <span>{{selected}}</span>
  </div>
  <script>
    var dt = [{
      value: '111',
      label: 'aaa'
    }, {
      value: '222',
      label: 'bbb'
    }, {
      value: '333',
      label: 'ccc'
    }, {
      value: '444',
      label: 'ddd'
    }, {
      value: '555',
      label: 'fff'
    }];
    var vm = new Vue({
      el: '#qwe',
      data: {
        options: [{
          value: '选项1',
          label: '黄金糕'
        }, {
          value: '选项2',
          label: '双皮奶'
        }, {
          value: '选项3',
          label: '蚵仔煎'
        }, {
          value: '选项4',
          label: '龙须面'
        }, {
          value: '选项5',
          label: '北京烤鸭'
        }],
        selected: ''
      },
      computed: {
        da: function () {
          var _self = this;
          return _self.options.filter(function (item) {
            return +item.value.split('')[2] > 2;
          });
        }
      }
    })
  </script>
</body>
</html>