VUE element组件生成的全选框如何获取值

//先声明
const Selection = ref([]);//获取
const handleSelectCodeForTicket = (val) => {console.log(val);// values.value = val;Selection.value = [];val.forEach((v) => {Selection.value.push(v);});console.log(Selection.value);
};

<el-table @selection-change="handleSelectCodeForTicket">
</el-table>