el-popconfirm 嵌套 el-button confirm失效

官方示例el-popconfirm @confirm 失效，无法触发

 <el-popconfirm title="确定删除吗？"
                   @confirm="handleDel(scope.row)">
  	<el-button slot="reference"
             type="text"
             :disabled="isSuperAdmin(scope.row)"
             size="small">删除</el-button>
</el-popconfirm>

官方文档错误，改@confirm为@onConfirm