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>
console
var Main = {
    data() {
      return {
        options4: [],
        value9: [],
        list: [],
        loading: false,
        states: ["Alabama", "Alaska", "Arizona",
        "Arkansas", "California", "Colorado",
        "Connecticut", "Delaware", "Florida",
        "Georgia", "Hawaii", "Idaho", "Illinois",
        "Indiana", "Iowa", "Kansas", "Kentucky",
        "Louisiana", "Maine", "Maryland",
        "Massachusetts", "Michigan", "Minnesota",
        "Mississippi", "Missouri", "Montana",
        "Nebraska", "Nevada", "New Hampshire",
        "New Jersey", "New Mexico", "New York",
        "North Carolina", "North Dakota", "Ohio",
        "Oklahoma", "Oregon", "Pennsylvania",
        "Rhode Island", "South Carolina",
        "South Dakota", "Tennessee", "Texas",
        "Utah", "Vermont", "Virginia",
        "Washington", "West Virginia", "Wisconsin",
        "Wyoming"]
      }
    },
    mounted() {
      this.list = this.states.map(item => {
        return { value: item, label: item };
      });
    },
    methods: {
      remoteMethod(query) {
        if (query !== '') {
          this.loading = true;
          setTimeout(() => {
            this.loading = false;
            this.options4 = this.list.filter(item => {
              return item.label.toLowerCase()
                .indexOf(query.toLowerCase()) > -1;
            });
          }, 200);
        } else {
          this.options4 = [];
        }
      }
    }
  }
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')
<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@1.3.1/lib/index.js"></script>
<div id="app">
<template>
  <el-select v-model="value9" multiple filterable="" remote placeholder="Please enter a keyword" :remote-method="remoteMethod" :loading="loading">
    <el-option v-for="item in options4" :key="item.value" :label="item.label" :value="item.value">
    </el-option>
  </el-select>
</template>
</div>
@import url("//unpkg.com/element-ui@1.3.1/lib/theme-default/index.css");