From ede5b5ed819ab6c8b1676624dba4676a2b734bd5 Mon Sep 17 00:00:00 2001
From: zhangenming <282126346@qq.com>
Date: Sun, 5 Mar 2023 22:39:26 +0800
Subject: [PATCH 1/4] Update renderList.ts

---
 packages/runtime-core/src/helpers/renderList.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/runtime-core/src/helpers/renderList.ts b/packages/runtime-core/src/helpers/renderList.ts
index 1655d555fb3..a21c7521ef0 100644
--- a/packages/runtime-core/src/helpers/renderList.ts
+++ b/packages/runtime-core/src/helpers/renderList.ts
@@ -60,8 +60,9 @@ export function renderList(
   const cached = (cache && cache[index!]) as VNode[] | undefined
 
   if (isArray(source) || isString(source)) {
-    ret = new Array(source.length)
-    for (let i = 0, l = source.length; i < l; i++) {
+    const len = source.length
+    ret = new Array(len)
+    for (let i = 0; i < len; i++) {
       ret[i] = renderItem(source[i], i, undefined, cached && cached[i])
     }
   } else if (typeof source === 'number') {

From 2a53a2412b489a189047972b529810f8d99e85cd Mon Sep 17 00:00:00 2001
From: zhangenming <282126346@qq.com>
Date: Sun, 5 Mar 2023 22:54:36 +0800
Subject: [PATCH 2/4] do a refactore by the way

---
 packages/runtime-core/src/helpers/renderList.ts | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/packages/runtime-core/src/helpers/renderList.ts b/packages/runtime-core/src/helpers/renderList.ts
index a21c7521ef0..502a84cec75 100644
--- a/packages/runtime-core/src/helpers/renderList.ts
+++ b/packages/runtime-core/src/helpers/renderList.ts
@@ -56,12 +56,11 @@ export function renderList(
   cache?: any[],
   index?: number
 ): VNodeChild[] {
-  let ret: VNodeChild[]
+  let ret: VNodeChild[] = []
   const cached = (cache && cache[index!]) as VNode[] | undefined
 
   if (isArray(source) || isString(source)) {
     const len = source.length
-    ret = new Array(len)
     for (let i = 0; i < len; i++) {
       ret[i] = renderItem(source[i], i, undefined, cached && cached[i])
     }
@@ -69,7 +68,6 @@ export function renderList(
     if (__DEV__ && !Number.isInteger(source)) {
       warn(`The v-for range expect an integer value but got ${source}.`)
     }
-    ret = new Array(source)
     for (let i = 0; i < source; i++) {
       ret[i] = renderItem(i + 1, i, undefined, cached && cached[i])
     }
@@ -80,14 +78,11 @@ export function renderList(
       )
     } else {
       const keys = Object.keys(source)
-      ret = new Array(keys.length)
       for (let i = 0, l = keys.length; i < l; i++) {
         const key = keys[i]
         ret[i] = renderItem(source[key], key, i, cached && cached[i])
       }
     }
-  } else {
-    ret = []
   }
 
   if (cache) {

From 0ed06afe685dc661c25205b11d314296f2ba1a37 Mon Sep 17 00:00:00 2001
From: zhangenming <282126346@qq.com>
Date: Sun, 5 Mar 2023 23:18:13 +0800
Subject: [PATCH 3/4] Update renderList.ts

---
 packages/runtime-core/src/helpers/renderList.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/runtime-core/src/helpers/renderList.ts b/packages/runtime-core/src/helpers/renderList.ts
index 502a84cec75..a5c5c0665b2 100644
--- a/packages/runtime-core/src/helpers/renderList.ts
+++ b/packages/runtime-core/src/helpers/renderList.ts
@@ -56,7 +56,7 @@ export function renderList(
   cache?: any[],
   index?: number
 ): VNodeChild[] {
-  let ret: VNodeChild[] = []
+  const ret: VNodeChild[] = []
   const cached = (cache && cache[index!]) as VNode[] | undefined
 
   if (isArray(source) || isString(source)) {

From 316aa6581074976684837fc99fc8e28f21dd1041 Mon Sep 17 00:00:00 2001
From: zhangenming <282126346@qq.com>
Date: Sun, 5 Mar 2023 23:38:01 +0800
Subject: [PATCH 4/4] revert

---
 packages/runtime-core/src/helpers/renderList.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/runtime-core/src/helpers/renderList.ts b/packages/runtime-core/src/helpers/renderList.ts
index a5c5c0665b2..a5453a4029c 100644
--- a/packages/runtime-core/src/helpers/renderList.ts
+++ b/packages/runtime-core/src/helpers/renderList.ts
@@ -56,7 +56,7 @@ export function renderList(
   cache?: any[],
   index?: number
 ): VNodeChild[] {
-  const ret: VNodeChild[] = []
+  let ret: VNodeChild[] = []
   const cached = (cache && cache[index!]) as VNode[] | undefined
 
   if (isArray(source) || isString(source)) {
@@ -88,5 +88,6 @@ export function renderList(
   if (cache) {
     cache[index!] = ret
   }
+  
   return ret
 }