element-ui cascader 省市区 动态加载

缺点：不能赋默认值（目前还没找到方法 ）
解决：原来是返回的默认值和请求的数据类型不一样（code） 如果数据类型一样是可以回显默认值的

props:设置赋值规则

数据格式

[
    {
       code: 省编码,
       name: "省名", cities:[ { code: 市编码, name: "市名", cities:[ { code: 区编码, name: "区名", } ] } ] }, { code: "140000", name: "山西省", cities: [ { code: "140400", name: "长治区", cities:[ { code: "140421", name: "长治县" } ] }, ] } ... ] 

<el-cascader
  v-model="address" :options="options" :props="props" separator="-" ></el-cascader> 

data(){
return{ address:[], options: [], props: { label: "name", value: "code", children: "cities", lazy: true, lazyLoad(node, resolve) { const { level } = node; getProvinces({ code: node.value }).then(res => { if (res.code == 200) { res.data.forEach(el => { el.leaf = level >= 2; }); resolve(res.data); } }); } }, } }