vue implements select method without changing the selected value

This article mainly shares with you an article that solves the problem that the selected value does not change after vue changes the calculated attribute. It has a good reference value and I hope it will be helpful to everyone. Let’s follow the editor to take a look, I hope it can help everyone.

First the code:

//...

  <p>
    <select>
      <option>{{item.value}}</option>
    </select>
    <span>{{selected}}</span>
  </p>
  <script>
    var dt = [{
      value: &#39;111&#39;,
      label: &#39;aaa&#39;
    }, {
      value: &#39;222&#39;,
      label: &#39;bbb&#39;
    }, {
      value: &#39;333&#39;,
      label: &#39;ccc&#39;
    }, {
      value: &#39;444&#39;,
      label: &#39;ddd&#39;
    }, {
      value: &#39;555&#39;,
      label: &#39;fff&#39;
    }];
    var vm = new Vue({
      el: &#39;#qwe&#39;,
      data: {
        options: [{
          value: &#39;选项1&#39;,
          label: &#39;黄金糕&#39;
        }, {
          value: &#39;选项2&#39;,
          label: &#39;双皮奶&#39;
        }, {
          value: &#39;选项3&#39;,
          label: &#39;蚵仔煎&#39;
        }, {
          value: &#39;选项4&#39;,
          label: &#39;龙须面&#39;
        }, {
          value: &#39;选项5&#39;,
          label: &#39;北京烤鸭&#39;
        }],
        selected: &#39;&#39;
      },
      computed: {
        da: function () {
          var _self = this;
          return _self.options.filter(function (item) {
            return +item.value.split(&#39;&#39;)[2] > 2;
          });
        }
      }
    })
  </script>

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