vue中的element UI使用es6实现自定义参数传递

<el-radio-group v-model="radio3" size="small" @change="e=>Handlechange(e,1)">
  <el-radio-button label="上海"></el-radio-button>
  <el-radio-button label="北京"></el-radio-button>
  <el-radio-button label="广州"></el-radio-button>
  <el-radio-button label="深圳"></el-radio-button>
</el-radio-group>

Handlechange(e,num){
  alert(JSON.stringify(e)+"-----"+num)
}