fix #1543

examples/routers/page.vue

@@ -1,8 +1,20 @@
 <template>
-    <Page :total="100" show-sizer show-elevator show-total></Page>
+    <div>
+        <Page :total="total" show-sizer show-elevator show-total></Page>
+        <Button type="primary" @click="subject">- 1</Button>
+    </div>
 </template>
 <script>
     export default {
-
+        data () {
+            return {
+                total: 21
+            }
+        },
+        methods: {
+            subject() {
+                this.total -= 1;
+            }
+        }
     }
 </script>

src/components/page/page.vue

@@ -135,6 +135,12 @@
             };
         },
         watch: {
+            total (val) {
+                let maxPage = Math.ceil(val / this.currentPageSize);
+                if (maxPage < this.currentPage && maxPage > 0) {
+                    this.currentPage = maxPage;
+                }
+            },
             current (val) {
                 this.currentPage = val;
             },