cache vnodes length (vuejs#5125)

mingmingwon · yyx990803 · commit 2afaac2b397b · 2017-03-08T10:24:25.000+08:00
diff --git a/src/core/vdom/vnode.js b/src/core/vdom/vnode.js
@@ -89,8 +89,9 @@ export function cloneVNode (vnode: VNode): VNode {
 }
 
 export function cloneVNodes (vnodes: Array<VNode>): Array<VNode> {
-  const res = new Array(vnodes.length)
-  for (let i = 0; i < vnodes.length; i++) {
+  const len = vnodes.length
+  const res = new Array(len)
+  for (let i = 0; i < len; i++) {
     res[i] = cloneVNode(vnodes[i])
   }
   return res

Original file line number	Diff line number	Diff line change
`@@ -89,8 +89,9 @@ export function cloneVNode (vnode: VNode): VNode {`
`89`	`89`	`}`
`90`	`90`
`91`	`91`	`export function cloneVNodes (vnodes: Array<VNode>): Array<VNode> {`
`92`		`- const res = new Array(vnodes.length)`
`93`		`- for (let i = 0; i < vnodes.length; i++) {`
	`92`	`+ const len = vnodes.length`
	`93`	`+ const res = new Array(len)`
	`94`	`+ for (let i = 0; i < len; i++) {`
`94`	`95`	`res[i] = cloneVNode(vnodes[i])`
`95`	`96`	`}`
`96`	`97`	`return res`