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

#### 移入展开 通过移入展开下级菜单，点击完成选择。 #### Hover Hover to expand sub menu, click to select option.

<template>
  <a-cascader :options="options" :displayRender="displayRender" expandTrigger="hover" @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: 'jiangsu',
        label: 'Jiangsu',
        children: [{
          value: 'nanjing',
          label: 'Nanjing',
          children: [{
            value: 'zhonghuamen',
            label: 'Zhong Hua Men',
          }],
        }],
      }]
    }
  },
  methods: {
    onChange(value) {
      console.log(value);
    },
    displayRender({ labels }) {
      return labels[labels.length - 1];
    }
  }
}
</script>