需求:做一个级联选择器,根据每次选中的id去调下一层的接口

<el-cascader size="small" :props="props"></el-cascader>

<script>
  let id = 0;

  export default {
    data() {
      return {
        props: {
          lazy: true,
          lazyLoad (node, resolve) {
            const { level } = node;
           if (!node.data) {
          service.getCategory(0).then(res => {
          console.log('getCategory', res)
          const nodes = Array.from(res).map(item => {
            return {
              value: item.id,
              label: `${item.name}`,
              leaf: level >= 1
            }
          })
          resolve(nodes)
        })
      } else {
        service.getCategory(node.data.value).then(res => {
          const nodes = Array.from(res).map(item => {
            return {
              value: item.id,
              label: `${item.name}`,
              leaf: level >= 1
            }
          })
          resolve(nodes)
        })
      }
          }
        }
      };
    }
  };
</script>