ant-design-vue/components/cascader/demo/search.md

#### 搜索 可以直接搜索选项并选择。 > `Cascader[showSearch]` 暂不支持服务端搜索，更多信息见 [#5547](https://github.com/ant-design/ant-design/issues/5547) #### Search Search and select options directly. > Now, `Cascader[showSearch]` doesn't support search on server, more info [#5547](https://github.com/ant-design/ant-design/issues/5547)

<template>
  <a-cascader :options="options" :showSearch="{filter}" @change="onChange" placeholder="Please select" />
</template>
<script>
export default {
  data() {
    return {
      options: [{
        value: 'zhejiang',
        label: 'Zhejiang',
        children: [{
          value: 'hangzhou',
          label: 'Hangzhou',
          children: [{
            value: 'xihu',
            label: 'West Lake',
          }, {
            value: 'xiasha',
            label: 'Xia Sha',
            disabled: true,
          }],
        }],
      }, {
        value: 'jiangsu',
        label: 'Jiangsu',
        children: [{
          value: 'nanjing',
          label: 'Nanjing',
          children: [{
            value: 'zhonghuamen',
            label: 'Zhong Hua men',
          }],
        }],
      }]
    }
  },
  methods: {
    onChange(value, selectedOptions) {
      console.log(value, selectedOptions);
    },
    filter(inputValue, path) {
      return (path.some(option => (option.label).toLowerCase().indexOf(inputValue.toLowerCase()) > -1));
    },
  }
}
</script>