1.
@selection-change="handleSelectionChange"
2.在data中增加數組：
multipleSelection: [],
3.
handleSelectionChange(val) {
this.multipleSelection = val;
if (this.multipleSelection.length > 1) {
//如果選擇了多條數據審核按鈕變為'批量審核通過'
this.examineBtn = "批量審核通過";
}
},