From 10f93cf70da3048052bd925dddc8af4d7068ce74 Mon Sep 17 00:00:00 2001
From: winerlu <winerlu@tencent.com>
Date: Sat, 16 Jan 2021 13:17:45 +0800
Subject: [PATCH] fix(table): fix column insertion disorder BUG

fix #1285
---
 packages/table/src/store/index.ts | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/packages/table/src/store/index.ts b/packages/table/src/store/index.ts
index 238a4214a3..574bb4719f 100644
--- a/packages/table/src/store/index.ts
+++ b/packages/table/src/store/index.ts
@@ -48,7 +48,15 @@ function useStore(): Store {
       const array = unref(states._columns)
 
       if (!parent) {
-        array.splice(index, 0, column)
+        if (array.length > index && (array[index] !== undefined)) {
+          array.splice(index, 0, column)
+          const nearlyEmptyIndex = array.findIndex((item, i) => i > index && item === undefined)
+          if (nearlyEmptyIndex > -1) {
+            array.splice(nearlyEmptyIndex, 1)
+          }
+        } else {
+          array[index] = column
+        }
         states._columns.value = array
       } else {
         if (parent && !parent.children) {
@@ -62,7 +70,6 @@ function useStore(): Store {
         states.selectable.value = column.selectable
         states.reserveSelection.value = column.reserveSelection
       }
-
       if (instance.$ready) {
         instance.store.updateColumns() // hack for dynamics insert column
         instance.store.scheduleLayout()