console 命令行工具 X clear
console
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <!-- import CSS -->
  <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
</head>
<body>
  <div id="app">
    <el-button @click="visible = true">Button</el-button>
    <el-dialog :visible.sync="visible" title="Hello world">
      <p>Try Element</p>
    </el-dialog>


    <section class="p-10">
    <el-select v-model="value" placeholder="请选择" filterable :filter-method="dataFilter">
      <el-option v-for="item in options" :key="item.value" :label="item.label" :value="item.value" />
    </el-select>
  </section>
  </div>
</body>
  <!-- import Vue before Element -->
  <script src="https://unpkg.com/vue/dist/vue.js"></script>
  <!-- import JavaScript -->
  <script src="https://unpkg.com/element-ui/lib/index.js"></script>
  <script>
    new Vue({
      el: '#app',
      data: function() {
        return { visible: false,
        optionsCopy: [{
          value: '1',
          label: 'meat'
        }, {
          value: '2',
          label: 'drink'
        }, {
          value: '3',
          label: 'food'
        }, {
          value: '4',
          label: '龙须面'
        }, {
          value: '5',
          label: '北京烤鸭'
        }],
        options: [{
          value: '1',
          label: 'meat'
        }, {
          value: '2',
          label: 'drink'
        }, {
          value: '3',
          label: 'food'
        }, {
          value: '4',
          label: '龙须面'
        }, {
          value: '5',
          label: '北京烤鸭'
        }],
        value: '' }
      },
      methods: {
      dataFilter(val) {
        this.value = val;
        if (val) { //val存在
          this.options = this.optionsCopy.filter((item) => {
            if (!!~item.label.indexOf(val) || !!~item.label.toUpperCase().indexOf(val.toUpperCase())) {
              return true
            }
          })
        } else { //val为空时，还原数组
          this.options = this.optionsCopy;
        }
      }
    }
    })
  </script>
</html>