el-select 获取change点击index
<el-select>
<el-option v-for="(item, index) in optionlist" @click.native ="handleSelect(index)"></el-option>
</el-select>
<el-select>
<el-option v-for="(item, index) in optionlist" @click.native ="handleSelect(index)"></el-option>
</el-select>