refactor: rename variable

Author: yyx990803

src/core/vdom/patch.js

@@ -369,7 +369,7 @@ export function createPatchFunction (backend) {
     let newEndIdx = newCh.length - 1
     let newStartVnode = newCh[0]
     let newEndVnode = newCh[newEndIdx]
-    let oldKeyToIdx, idxInOld, elmToMove, refElm
+    let oldKeyToIdx, idxInOld, vnodeToMove, refElm
 
     // removeOnly is a special flag used only by <transition-group>
     // to ensure removed elements stay in correct relative positions
@@ -407,18 +407,18 @@ export function createPatchFunction (backend) {
         if (isUndef(idxInOld)) { // New element
           createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm)
         } else {
-          elmToMove = oldCh[idxInOld]
+          vnodeToMove = oldCh[idxInOld]
           /* istanbul ignore if */
-          if (process.env.NODE_ENV !== 'production' && !elmToMove) {
+          if (process.env.NODE_ENV !== 'production' && !vnodeToMove) {
             warn(
               'It seems there are duplicate keys that is causing an update error. ' +
               'Make sure each v-for item has a unique key.'
             )
           }
-          if (sameVnode(elmToMove, newStartVnode)) {
-            patchVnode(elmToMove, newStartVnode, insertedVnodeQueue)
+          if (sameVnode(vnodeToMove, newStartVnode)) {
+            patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue)
             oldCh[idxInOld] = undefined
-            canMove && nodeOps.insertBefore(parentElm, elmToMove.elm, oldStartVnode.elm)
+            canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm)
           } else {
             // same key but different element. treat as new element
             createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm)