fix(Pagination): improve page size change handling and current page validation

Author: RSS1102

packages/components/pagination/pagination.tsx

@@ -1,4 +1,4 @@
-import { defineComponent, computed, ref, watch, toRefs, getCurrentInstance } from 'vue';
+import { defineComponent, computed, ref, watch, toRefs, getCurrentInstance, nextTick } from 'vue';
 import { isNaN, isObject } from 'lodash-es';
 import {
   PageFirstIcon as TdPageFirstIcon,
@@ -183,37 +183,46 @@ export default defineComponent({
     };
 
     const onSelectorChange: (e: string) => void = (e) => {
-      if (props.disabled) {
-        return;
-      }
-      const pageSize: number = parseInt(e, 10);
-      let pageCount = 1;
-      if (pageSize > 0) {
-        pageCount = Math.max(Math.ceil(props.total / pageSize), 1);
-      }
+      if (props.disabled) return;
 
-      let isIndexChange = false;
+      const pageSize: number = parseInt(e, 10);
+      const newPageCount = pageSize > 0 ? Math.max(Math.ceil(props.total / pageSize), 1) : 1;
 
-      if (innerCurrent.value > pageCount) {
-        isIndexChange = true;
-      }
+      // 当前页在变更 pageSize 之后是否会超出新的页码范围
+      const prevCurrent = innerCurrent.value;
 
       /**
        * 分页大小变化事件
        * @param {Number} pageSize 分页大小
        * @param {Number} index 当前页
        */
       const pageInfo = {
-        current: isIndexChange ? pageCount : innerCurrent.value,
-        previous: innerCurrent.value,
+        current: prevCurrent,
+        previous: prevCurrent,
         pageSize,
       };
+
       setInnerPageSize(pageSize, pageInfo);
-      if (isIndexChange) {
-        toPage(pageCount, pageInfo);
-      } else {
-        props.onChange?.(pageInfo);
-      }
+
+      nextTick(() => {
+        // 使用外部受控的 props.current，如果没有则使用 prevCurrent
+        const finalCurrent = props.current ?? prevCurrent;
+        const willExceed = finalCurrent > newPageCount;
+        const finalPageInfo = {
+          ...pageInfo,
+          current: finalCurrent,
+        };
+
+        if (willExceed) {
+          // 当前页超出新页码范围时，跳转到最后一页
+          toPage(newPageCount, finalPageInfo);
+        } else if (finalCurrent !== prevCurrent) {
+          toPage(finalCurrent, finalPageInfo);
+        } else {
+          // 正常触发 onChange
+          props.onChange?.(finalPageInfo);
+        }
+      });
     };
 
     const onJumperChange = (val: number) => {