Fixed: Fix the issue of exporting selected table data.

src/components/Table/DataTable/compenents/el-data-table/el-data-table.vue

@@ -5,6 +5,11 @@
       <slot name="no-data" />
     </template>
     <template v-else>
+      <!--
+        过滤 selection 相关事件的透传，避免父组件收到 el-table 原生的"当前页" selection，
+        导致跨页选择（persistSelection）被覆盖，只剩当页数据。
+        选择事件统一走 selectStrategy，在内部维护全量 selected 并向外 emit。
+      -->
       <el-table
         ref="table"
         v-loading="loading"
@@ -12,7 +17,7 @@
         :row-class-name="rowClassName"
         v-bind="tableAttrs"
         @select="selectStrategy.onSelect"
-        v-on="$listeners"
+        v-on="forwardListeners"
         @selection-change="selectStrategy.onSelectionChange"
         @select-all="selectStrategy.onSelectAll($event, canSelect)"
         @sort-change="onSortChange"
@@ -803,6 +808,16 @@ export default {
     selectStrategy() {
       return getSelectStrategy(this)
     },
+    // 过滤会与内部选择策略冲突的事件，避免父组件只拿到当前页 selection
+    forwardListeners() {
+      const listeners = { ...this.$listeners }
+      delete listeners['selection-change']
+      delete listeners['select']
+      delete listeners['select-all']
+      // 外层如需监听 selection 变化，请监听本组件透出的 selection-change，
+      // 该事件来自选择策略，已汇总跨页后的全量 selected
+      return listeners
+    },
     searchLocatedSlotKeys() {
       return getLocatedSlotKeys(this.$slots, 'search:')
     },

src/components/Table/DataTable/compenents/el-data-table/utils/select-strategy.js

@@ -79,6 +79,9 @@ class StrategyPersistSelection extends StrategyAbstract {
   onSelect(selection, row) {
     const isChosen = selection.indexOf(row) > -1
     this.toggleRowSelection(row, isChosen)
+    // el-table 原生 selection-change 仅包含当前页。为保证跨页勾选有效，
+    // 在内部策略维护完 selected 后，向外部同步"全量已选"。
+    this.elDataTable.$emit('selection-change', this.elDataTable.selected)
   }
 
   /**
@@ -149,11 +152,15 @@ class StrategyPersistSelection extends StrategyAbstract {
 
     this.elDataTable.$emit('toggle-row-selection', isSelected, row)
     this.updateElTableSelection()
+    // 切换后同步全量 selection（跨页）
+    this.elDataTable.$emit('selection-change', this.elDataTable.selected)
   }
 
   clearSelection() {
     this.elDataTable.selected = []
     this.updateElTableSelection()
+    // 清空后也同步给外部，保持外层状态一致
+    this.elDataTable.$emit('selection-change', this.elDataTable.selected)
   }
 
   /**