elementui elcascader懒加载

地理位置懒加载；
<el-cascader
ref="cascaderLoc"
@visible-change="changeBgClass"
v-model="form.assetLoc"
:option="optionsAssetLoc"
:props="locationProp"
emitPayh="true"
@change="getLocNodes"
filyerable
clearable
>
</el-cascader>
2.data中配置
optionsAssetLoc:[],
locationProps:{
    checkStrictly:true,//严格遵循父子节点互不关联
    value:"value",
    lazy:true,
    lazyLoad:function lazyLoad(node,resolve){
                const{data,level,path}=node;
                if(!data||(data&&data.haschild==false)||(data&&data.leaf==true)){
                  return resolve([])
               }
                let code=data.value;
                //调用请求获取数据
                this.vm.getLocationOption(code,path,node).then(
                    {resolve(res)}
                )

   }.bind(this)
}
created(){
    this.getLocationOption();
}
methods:{
    getLocationOption(code,path,node){
        return new Promise(resolve,reject){
            let param {code:code||"",async:false};
            thisObj.callAPIcom(url,param,"post",res=>{
                if(res&&res.resp.code==0){
                     if(this.optionAssetLoc.length==0){
                         res.data[0].locData[0].children=[];
                         this.optionAssetLoc=res.data[0].locData;
                     }else{
                                  let result=res.data[0].locData[0];
                                  if(result.children.length==0){
                                       this.$refs.cascaderLoc.dropDowVisible=false;
                                  }
                                  resolve(result.children)
                             }
                 }
            })
        }

    }






}