方法一：

参数传递

<el-cascader v-model="value" :options="List"  @expand-change="handleChange($event,'222')" />

<el-cascader v-model="value" :options="List"  @change="handleChange($event,'222')" />

参数接收

handleChange(value, path) => {
        console.log('value', value)
        console.log('path', path)
        )

select一样用法

方法二

<el-cascader v-model="value" :options="List"  @expand-change="(val)=>handleChange(val,'222')" />

<el-cascader v-model="value" :options="List"  @change="(val)=>handleChange(val,'222')" />

接收同上

小记基础