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Match-id-abcf03478cbcdf950f7350df7f2e23add28411d0

This commit is contained in:
* 2022-11-08 10:29:40 +08:00 committed by *
parent 9075dbe1b2
commit 805f59c8fe
2 changed files with 147 additions and 250 deletions
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51
libs/horizon/src/renderer/TreeBuilder.ts
View File

@ -81,7 +81,7 @@ function collectDirtyNodes(vNode: VNode, parent: VNode): void {
if (parent.dirtyNodes === null) { if (parent.dirtyNodes === null) {
parent.dirtyNodes = dirtyNodes; parent.dirtyNodes = dirtyNodes;
} else { } else {
parent.dirtyNodes.push(...dirtyNodes); parent.dirtyNodes.push(...vNode.dirtyNodes);
dirtyNodes.length = 0; dirtyNodes.length = 0;
} }
vNode.dirtyNodes = null; vNode.dirtyNodes = null;
@ -100,7 +100,7 @@ function collectDirtyNodes(vNode: VNode, parent: VNode): void {
// 尝试完成当前工作单元，然后移动到下一个兄弟工作单元。如果没有更多的同级，请返回父vNode。 // 尝试完成当前工作单元，然后移动到下一个兄弟工作单元。如果没有更多的同级，请返回父vNode。
function bubbleVNode(vNode: VNode): void { function bubbleVNode(vNode: VNode): void {
let node: VNode | null = vNode; let node = vNode;
do { do {
const parent = node.parent; const parent = node.parent;
@ -179,18 +179,14 @@ function isEqualByIndex(idx: number, pathArrays: string[][]) {
function getChildByIndex(vNode: VNode, idx: number) { function getChildByIndex(vNode: VNode, idx: number) {
let node = vNode.child; let node = vNode.child;
for (let i = 0; i < idx; i++) { for (let i = 0; i < idx; i++) {
if (node !== null) {
node = node.next; node = node.next;
} else {
return null;
}
} }
return node; return node;
} }
// 从多个更新节点中，计算出开始节点。即：找到最近的共同的父辈节点 // 从多个更新节点中，计算出开始节点。即：找到最近的共同的父辈节点
export function calcStartUpdateVNode(treeRoot: VNode) { export function calcStartUpdateVNode(treeRoot: VNode) {
const toUpdateNodes = Array.from(treeRoot.toUpdateNodes!); const toUpdateNodes = Array.from(treeRoot.toUpdateNodes);
if (toUpdateNodes.length === 0) { if (toUpdateNodes.length === 0) {
return treeRoot; return treeRoot;
@ -219,12 +215,12 @@ export function calcStartUpdateVNode(treeRoot: VNode) {
// 得到相等的路径 // 得到相等的路径
const startNodePath = pathArrays[0].slice(0, commonPathEndIndex); const startNodePath = pathArrays[0].slice(0, commonPathEndIndex);
let node: VNode | null = treeRoot; let node = treeRoot;
for (let i = 1; i < startNodePath.length; i++) { for (let i = 1; i < startNodePath.length; i++) {
const pathIndex = Number(startNodePath[i]); const pathIndex = Number(startNodePath[i]);
node = getChildByIndex(node, pathIndex); node = getChildByIndex(node, pathIndex)!;
// 路径错误时，回退到从根更新 // 路径错误时，回退到从根更新
if (node === null) { if (node == null) {
return treeRoot; return treeRoot;
} }
} }
@ -243,7 +239,7 @@ function buildVNodeTree(treeRoot: VNode) {
setStartVNode(startVNode); setStartVNode(startVNode);
// 清空toUpdateNodes // 清空toUpdateNodes
treeRoot.toUpdateNodes!.clear(); treeRoot.toUpdateNodes.clear();
if (startVNode.tag !== TreeRoot) { if (startVNode.tag !== TreeRoot) {
// 不是根节点 // 不是根节点
@ -351,10 +347,16 @@ function renderFromRoot(treeRoot) {
// 2. 提交变更 // 2. 提交变更
submitToRender(treeRoot); submitToRender(treeRoot);
popCurrentRoot(); popCurrentRoot();
if (window.__HORIZON_DEV_HOOK__) {
// 与Devtool通信 const hook = window.__HORIZON_DEV_HOOK__;
sendRootToDevTool(treeRoot); // injector.js 可能在 Horizon 代码之后加载，此时无 __HORIZON_DEV_HOOK__ 全局变量
// Horizon 代码初次加载时不会初始化 helper
if (!hook.isInit) {
injectUpdater();
}
hook.addIfNotInclude(treeRoot);
hook.send(treeRoot);
}
return null; return null;
} }
@ -401,25 +403,6 @@ export function launchUpdateFromVNode(vNode: VNode) {
} }
} }
declare global {
interface Window {
__HORIZON_DEV_HOOK__: any;
}
}
function sendRootToDevTool(treeRoot) {
if (window.__HORIZON_DEV_HOOK__) {
const hook = window.__HORIZON_DEV_HOOK__;
// injector.js 可能在 Horizon 代码之后加载，此时无 __HORIZON_DEV_HOOK__ 全局变量
// Horizon 代码初次加载时不会初始化 helper
if (!hook.isInit) {
injectUpdater();
}
hook.addIfNotInclude(treeRoot);
hook.send(treeRoot);
}
}
// ============================== HorizonDOM使用 ============================== // ============================== HorizonDOM使用 ==============================
export function runDiscreteUpdates() { export function runDiscreteUpdates() {
if (checkMode(ByAsync) || checkMode(InRender)) { if (checkMode(ByAsync) || checkMode(InRender)) {

274
libs/horizon/src/renderer/diff/nodeDiffComparator.ts
View File

@ -34,13 +34,6 @@ enum DiffCategory {
ARR_NODE = 'ARR_NODE', ARR_NODE = 'ARR_NODE',
} }
type AppendVNode = (vnode: VNode) => void;
interface DiffRightSideResult {
rightIdx: number;
rightEndOldNode: VNode;
rightNewNode: VNode | null;
}
// 检查是不是被 FRAGMENT 包裹 // 检查是不是被 FRAGMENT 包裹
function isNoKeyFragment(child: any) { function isNoKeyFragment(child: any) {
return child != null && child.type === TYPE_FRAGMENT && child.key === null; return child != null && child.type === TYPE_FRAGMENT && child.key === null;
@ -118,12 +111,19 @@ function getNodeType(newChild: any): string | null {
} }
// 设置vNode的flag // 设置vNode的flag
function setVNodeAdditionFlag(newNode: VNode) { function setVNodeAdditionFlag(newNode: VNode, lastPosition: number): number {
if (newNode.isCreated) { let position = lastPosition;
if (newNode.isCreated || newNode.eIndex < lastPosition) {
// 位置 小于 上一个复用的位置 // 位置 小于 上一个复用的位置
// 标记为新增 // 标记为新增
FlagUtils.setAddition(newNode); FlagUtils.setAddition(newNode);
} else {
// 复用
position = newNode.eIndex;
} }
return position;
} }
// 获取新节点 // 获取新节点
@ -231,75 +231,74 @@ function getOldNodeFromMap(nodeMap: Map<string | number, VNode>, newIdx: number,
return null; return null;
} }
/** // diff数组类型的节点，核心算法
* 左端新老节点对比 function diffArrayNodesHandler(parentNode: VNode, firstChild: VNode | null, newChildren: Array<any>): VNode | null {
* @param firstNode 第一个VNode let resultingFirstChild: VNode | null = null;
* @param newChildren 新的JSX children
* @param parentNode 父节点 let prevNewNode: VNode | null = null;
* @param appendNode 添加节点
*/ let oldNode = firstChild;
function diffLeftSide(firstNode: VNode | null, newChildren: Array<any>, parentNode: VNode, appendNode: AppendVNode) {
let nextOldNode: VNode | null = null; let nextOldNode: VNode | null = null;
let theLastPosition = 0;
// 从左边开始的位置 // 从左边开始的位置
let leftIdx = 0; let leftIdx = 0;
// 1. 从左侧开始比对currentVNode和newChildren，若不能复用则跳出循环
for (; firstNode !== null && leftIdx < newChildren.length; leftIdx++) { function appendNode(newNode: VNode) {
if (firstNode.eIndex > leftIdx) { if (prevNewNode === null) {
// 当新旧节点位置不一，则将缓存当前的旧节点，放到下一次对比 resultingFirstChild = newNode;
nextOldNode = firstNode; newNode.cIndex = 0;
firstNode = null;
} else { } else {
nextOldNode = firstNode.next; prevNewNode.next = newNode;
newNode.cIndex = prevNewNode.cIndex + 1;
}
markVNodePath(newNode);
prevNewNode = newNode;
} }
let canBeReuse;
let newNode;
// 1. 从左侧开始比对currentVNode和newChildren，若不能复用则跳出循环
for (; oldNode !== null && leftIdx < newChildren.length; leftIdx++) {
if (oldNode.eIndex > leftIdx) {
// 当新旧节点位置不一，则将缓存当前的旧节点，放到下一次对比
nextOldNode = oldNode;
oldNode = null;
} else {
nextOldNode = oldNode.next;
}
canBeReuse = checkCanReuseNode(oldNode, newChildren[leftIdx], leftIdx);
// 不能复用，break // 不能复用，break
if (!checkCanReuseNode(firstNode, newChildren[leftIdx], leftIdx)) { if (!canBeReuse) {
firstNode = firstNode ?? nextOldNode; oldNode = oldNode ?? nextOldNode;
break; break;
} }
const newNode = getNewNode(parentNode, newChildren[leftIdx], firstNode); newNode = getNewNode(parentNode, newChildren[leftIdx], oldNode);
// 没有生成新节点，break // 没有生成新节点，break
if (!newNode) { if (!newNode) {
firstNode = firstNode ?? nextOldNode; oldNode = oldNode ?? nextOldNode;
break; break;
} }
// diff过程中，需要将现有的节点清除掉，如果是创建，则不需要处理（因为没有现存节点） // diff过程中，需要将现有的节点清除掉，如果是创建，则不需要处理（因为没有现存节点）
if (firstNode && newNode.isCreated) { if (oldNode && newNode.isCreated) {
deleteVNode(parentNode, firstNode); deleteVNode(parentNode, oldNode);
} }
setVNodeAdditionFlag(newNode); theLastPosition = setVNodeAdditionFlag(newNode, theLastPosition);
newNode.eIndex = leftIdx; newNode.eIndex = leftIdx;
appendNode(newNode); appendNode(newNode);
firstNode = nextOldNode; oldNode = nextOldNode;
} }
return { leftEndOldNode: firstNode, leftIdx };
}
/**
* 右端新老节点对比
* @param leftEndOldNode 左端对比完成后第一个不同的老节点
* @param leftIdx 左端diff完成后Index
* @param newChildren 新的JSX children
* @param parentNode 父节点
*/
function diffRightSide(
leftEndOldNode: VNode | null,
leftIdx: number,
newChildren: Array<any>,
parentNode: VNode
): DiffRightSideResult {
let newNode;
let canBeReuse = false;
let rightIdx = newChildren.length; let rightIdx = newChildren.length;
let rightEndOldNode; // 老节点中最右边匹配的节点引用 abcde --> abfde 则rightEndOldNode = c; let rightEndOldNode; // 老节点中最右边匹配的节点引用 abcde --> abfde 则rightEndOldNode = c;
let rightNewNode: VNode | null = null; // 最右边匹配的节点引用 abcde --> abfde 则rightNewNode = d; let rightNewNode: VNode | null = null; // 最右边匹配的节点引用 abcde --> abfde 则rightNewNode = d;
// 从后往前，新资源的位置还没有到最末端，旧的vNode也还没遍历完，则可以考虑从后往前开始 // 从后往前，新资源的位置还没有到最末端，旧的vNode也还没遍历完，则可以考虑从后往前开始
if (rightIdx > leftIdx && leftEndOldNode !== null) { if (rightIdx > leftIdx && oldNode !== null) {
const rightRemainingOldChildren = transRightChildrenToArray(leftEndOldNode); const rightRemainingOldChildren = transRightChildrenToArray(oldNode);
let rightOldIndex: number | null = rightRemainingOldChildren.length - 1; let rightOldIndex: number | null = rightRemainingOldChildren.length - 1;
// 2. 从右侧开始比对currentVNode和newChildren，若不能复用则跳出循环 // 2. 从右侧开始比对currentVNode和newChildren，若不能复用则跳出循环
@ -334,69 +333,34 @@ function diffRightSide(
deleteVNode(parentNode, rightOldNode); deleteVNode(parentNode, rightOldNode);
} }
setVNodeAdditionFlag(newNode); setVNodeAdditionFlag(newNode, theLastPosition);
newNode.eIndex = rightIdx - 1; newNode.eIndex = rightIdx - 1;
rightOldIndex--; rightOldIndex--;
rightEndOldNode = rightOldNode; rightEndOldNode = rightOldNode;
} }
} }
return { rightIdx, rightEndOldNode, rightNewNode }; // 3. 新节点已经处理完成
} if (leftIdx === rightIdx) {
/**
* 添加所有右端Diff完成的节点
* @param leftEndOldNode 左端对比完成后第一个不同的老节点
* @param parentNode 父节点
* @param firstChild 第一个VNode
* @param newChildren 新的JSX children
* @param diffRightSideResult 右端diff结果
* @param appendNode 添加节点
*/
function appendRightSideNode(
leftEndOldNode: VNode | null,
parentNode: VNode,
firstChild: VNode | null,
newChildren: Array<any>,
diffRightSideResult: DiffRightSideResult,
appendNode: AppendVNode
) {
const { rightEndOldNode, rightNewNode } = diffRightSideResult;
// 清除中间残留的节点
if (firstChild && parentNode.tag === DomComponent && newChildren.length === 0) { if (firstChild && parentNode.tag === DomComponent && newChildren.length === 0) {
FlagUtils.markClear(parentNode); FlagUtils.markClear(parentNode);
parentNode.clearChild = firstChild; parentNode.clearChild = firstChild;
} else { } else {
deleteVNodes(parentNode, leftEndOldNode, rightEndOldNode); deleteVNodes(parentNode, oldNode, rightEndOldNode);
} }
if (rightNewNode) { if (rightNewNode) {
appendNode(rightNewNode); appendNode(rightNewNode);
setVNodesCIndex(rightNewNode, rightNewNode.cIndex + 1); setVNodesCIndex(rightNewNode, prevNewNode.cIndex + 1);
} }
}
/** return resultingFirstChild;
* 添加左右端比较完成后剩余新节点和右侧节点 }
* @param leftEndOldNode 左端对比完成后第一个不同的老节点
* @param parentNode 父节点 // 4. 新节点还有一部分，但是老节点已经没有了
* @param newChildren 新的JSX children if (oldNode === null) {
* @param leftIdx 左端diff完成后Index
* @param diffRightSideResult 右端diff结果
* @param appendNode 添加节点
*/
function appendAllRestNode(
leftEndOldNode: VNode | null,
parentNode: VNode,
newChildren: Array<any>,
leftIdx: number,
diffRightSideResult: DiffRightSideResult,
appendNode: AppendVNode
) {
let isDirectAdd = false; let isDirectAdd = false;
const { rightIdx, rightNewNode } = diffRightSideResult; // TODO: 是否可以扩大至非dom类型节点
// 如果dom节点在上次添加前没有节点，说明本次添加时，可以直接添加到最后，不需要通过 getSiblingDom 函数找到 before 节点 // 如果dom节点在上次添加前没有节点，说明本次添加时，可以直接添加到最后，不需要通过 getSiblingDom 函数找到 before 节点
if ( if (
parentNode.tag === DomComponent && parentNode.tag === DomComponent &&
@ -407,7 +371,7 @@ function appendAllRestNode(
} }
const isAddition = parentNode.tag === DomPortal || !parentNode.isCreated; const isAddition = parentNode.tag === DomPortal || !parentNode.isCreated;
for (; leftIdx < rightIdx; leftIdx++) { for (; leftIdx < rightIdx; leftIdx++) {
const newNode = getNewNode(parentNode, newChildren[leftIdx], null); newNode = getNewNode(parentNode, newChildren[leftIdx], null);
if (newNode !== null) { if (newNode !== null) {
if (isAddition) { if (isAddition) {
@ -425,34 +389,16 @@ function appendAllRestNode(
appendNode(rightNewNode); appendNode(rightNewNode);
setVNodesCIndex(rightNewNode.next, rightNewNode.cIndex + 1); setVNodesCIndex(rightNewNode.next, rightNewNode.cIndex + 1);
} }
}
return resultingFirstChild;
}
/** // 5. 新节点还有一部分，但是老节点也还有一部分
* 双端对比完成，新老节点都有剩余时，构造LIS（最长递增子序列）
* 属于LIS的新节点直接复用，否则新增
* @param leftEndOldNode 左端对比完成后第一个不同的老节点
* @param parentNode 父节点
* @param newChildren 新的JSX children
* @param leftIdx 左端diff完成后Index
* @param diffRightSideResult 右端diff结果
* @param appendNode 添加节点
*/
function appendNodeWithLIS(
leftEndOldNode: VNode,
parentNode: VNode,
newChildren: Array<any>,
leftIdx: number,
diffRightSideResult: DiffRightSideResult,
appendNode: AppendVNode
) {
const { rightIdx, rightNewNode, rightEndOldNode } = diffRightSideResult;
// 把剩下的currentVNode转成Map // 把剩下的currentVNode转成Map
const leftChildrenMap = transLeftChildrenToMap(leftEndOldNode, rightEndOldNode); const leftChildrenMap = transLeftChildrenToMap(oldNode, rightEndOldNode);
// 通过贪心算法+二分法获取最长递增子序列 // 通过贪心算法+二分法获取最长递增子序列
const eIndexes: Array<number> = []; // 记录 eIndex 值 const eIndexes: Array<number> = []; // 记录 eIndex 值
const subsequence: Array<number> = []; // 记录最长子序列在eIndexes中的 index 值 const result: Array<number> = []; // 记录最长子序列在eIndexes中的 index 值
const preIndex: Array<number> = []; // 贪心算法在替换的过程中会使得数组不正确，通过记录preIndex找到正确值 const preIndex: Array<number> = []; // 贪心算法在替换的过程中会使得数组不正确，通过记录preIndex找到正确值
const reuseNodes: (VNode | null)[] = []; // 记录复用的 VNode const reuseNodes: (VNode | null)[] = []; // 记录复用的 VNode
let i = 0; let i = 0;
@ -460,7 +406,7 @@ function appendNodeWithLIS(
let last; let last;
for (; leftIdx < rightIdx; leftIdx++) { for (; leftIdx < rightIdx; leftIdx++) {
oldNodeFromMap = getOldNodeFromMap(leftChildrenMap, leftIdx, newChildren[leftIdx]); oldNodeFromMap = getOldNodeFromMap(leftChildrenMap, leftIdx, newChildren[leftIdx]);
const newNode = getNewNode(parentNode, newChildren[leftIdx], oldNodeFromMap); newNode = getNewNode(parentNode, newChildren[leftIdx], oldNodeFromMap);
if (newNode !== null) { if (newNode !== null) {
if (newNode.isCreated) { if (newNode.isCreated) {
// 新VNode，直接打上标签新增，不参与到复用，旧的VNode会在后面打上delete标签 // 新VNode，直接打上标签新增，不参与到复用，旧的VNode会在后面打上delete标签
@ -471,27 +417,27 @@ function appendNodeWithLIS(
if (oldNodeFromMap !== null) { if (oldNodeFromMap !== null) {
const eIndex = newNode.eIndex; const eIndex = newNode.eIndex;
eIndexes.push(eIndex); eIndexes.push(eIndex);
last = eIndexes[subsequence[subsequence.length - 1]]; last = eIndexes[result[result.length - 1]];
if (eIndex > last || last === undefined) { if (eIndex > last || last === undefined) {
// 大的 eIndex直接放在最后 // 大的 eIndex直接放在最后
preIndex[i] = subsequence[subsequence.length - 1]; preIndex[i] = result[result.length - 1];
subsequence.push(i); result.push(i);
} else { } else {
let start = 0; let start = 0;
let end = subsequence.length - 1; let end = result.length - 1;
let middle; let middle;
// 二分法找到需要替换的值 // 二分法找到需要替换的值
while (start < end) { while (start < end) {
middle = Math.floor((start + end) / 2); middle = Math.floor((start + end) / 2);
if (eIndexes[subsequence[middle]] > eIndex) { if (eIndexes[result[middle]] > eIndex) {
end = middle; end = middle;
} else { } else {
start = middle + 1; start = middle + 1;
} }
} }
if (eIndex < eIndexes[subsequence[start]]) { if (eIndex < eIndexes[result[start]]) {
preIndex[i] = subsequence[start - 1]; preIndex[i] = result[start - 1];
subsequence[start] = i; result[start] = i;
} }
} }
i++; i++;
@ -504,13 +450,13 @@ function appendNodeWithLIS(
} }
// 向前回溯找到正确的结果 // 向前回溯找到正确的结果
let length = subsequence.length; let length = result.length;
let prev = subsequence[length - 1]; let prev = result[length - 1];
while (length-- > 0) { while (length-- > 0) {
subsequence[length] = prev; result[length] = prev;
prev = preIndex[subsequence[length]]; prev = preIndex[result[length]];
} }
subsequence.forEach(idx => { result.forEach(idx => {
// 把需要复用的节点从 restNodes 中清理掉，因为不需要打 add 标记，直接复用 dom 节点 // 把需要复用的节点从 restNodes 中清理掉，因为不需要打 add 标记，直接复用 dom 节点
reuseNodes[idx] = null; reuseNodes[idx] = null;
}); });
@ -528,45 +474,7 @@ function appendNodeWithLIS(
appendNode(rightNewNode); appendNode(rightNewNode);
setVNodesCIndex(rightNewNode.next, rightNewNode.cIndex + 1); setVNodesCIndex(rightNewNode.next, rightNewNode.cIndex + 1);
} }
}
// diff数组类型的节点，核心算法
function diffArrayNodesHandler(parentNode: VNode, firstChild: VNode | null, newChildren: Array<any>): VNode | null {
let resultingFirstChild: VNode | null = null;
let prevNewNode: VNode | null = null;
function appendNode(newNode: VNode) {
if (prevNewNode === null) {
resultingFirstChild = newNode;
newNode.cIndex = 0;
} else {
prevNewNode.next = newNode;
newNode.cIndex = prevNewNode.cIndex + 1;
}
markVNodePath(newNode);
prevNewNode = newNode;
}
// 1. 左端新老节点对比
const { leftEndOldNode, leftIdx } = diffLeftSide(firstChild, newChildren, parentNode, appendNode);
// 2. 右端新老节点对比
const diffRightSideResult = diffRightSide(leftEndOldNode, leftIdx, newChildren, parentNode);
// 3. 新节点已经处理完成
if (leftIdx === diffRightSideResult.rightIdx) {
appendRightSideNode(leftEndOldNode, parentNode, firstChild, newChildren, diffRightSideResult, appendNode);
return resultingFirstChild;
}
// 4. 新节点还有一部分，但是老节点已经没有了
if (leftEndOldNode === null) {
appendAllRestNode(leftEndOldNode, parentNode, newChildren, leftIdx, diffRightSideResult, appendNode);
return resultingFirstChild;
}
// 5. 新节点还有一部分，但是老节点也还有一部分
appendNodeWithLIS(leftEndOldNode, parentNode, newChildren, leftIdx, diffRightSideResult, appendNode);
return resultingFirstChild; return resultingFirstChild;
} }
@ -590,10 +498,10 @@ function diffIteratorNodesHandler(
newChildrenIterable: Iterable<any> newChildrenIterable: Iterable<any>
): VNode | null { ): VNode | null {
const iteratorFn = getIteratorFn(newChildrenIterable); const iteratorFn = getIteratorFn(newChildrenIterable);
const iteratorObj: Iterator<any> = iteratorFn.call(newChildrenIterable); const iteratorObj = iteratorFn.call(newChildrenIterable);
// 把iterator转测数组 // 把iterator转测数组
const childrenArray: any[] = []; const childrenArray = [];
let result = iteratorObj.next(); let result = iteratorObj.next();
while (!result.done) { while (!result.done) {
childrenArray.push(result.value); childrenArray.push(result.value);
@ -604,7 +512,7 @@ function diffIteratorNodesHandler(
} }
// 新节点是字符串类型 // 新节点是字符串类型
function diffStringNodeHandler(parentNode: VNode, newChild: any, firstChildVNode: VNode | null, isComparing: boolean) { function diffStringNodeHandler(parentNode: VNode, newChild: any, firstChildVNode: VNode, isComparing: boolean) {
let newTextNode: VNode | null = null; let newTextNode: VNode | null = null;
// 第一个vNode是Text，则复用 // 第一个vNode是Text，则复用
@ -628,7 +536,13 @@ function diffStringNodeHandler(parentNode: VNode, newChild: any, firstChildVNode
} }
// 新节点是对象类型 // 新节点是对象类型
function diffObjectNodeHandler(parentNode: VNode, firstChild: VNode | null, newChild: any, isComparing: boolean) { function diffObjectNodeHandler(
parentNode: VNode,
firstChild: VNode | null,
newChild: any,
firstChildVNode: VNode,
isComparing: boolean
) {
let canReuseNode: VNode | null = null; let canReuseNode: VNode | null = null;
// 通过key比对是否有可以reuse // 通过key比对是否有可以reuse
@ -645,7 +559,7 @@ function diffObjectNodeHandler(parentNode: VNode, firstChild: VNode | null, newC
} }
let resultNode: VNode | null = null; let resultNode: VNode | null = null;
let startDelVNode: VNode | null = firstChild; let startDelVNode = firstChildVNode;
if (newChild.vtype === TYPE_COMMON_ELEMENT) { if (newChild.vtype === TYPE_COMMON_ELEMENT) {
if (canReuseNode) { if (canReuseNode) {
// 可以复用 // 可以复用
@ -740,7 +654,7 @@ export function createChildrenByDiff(
// 5. newChild是对象类型 // 5. newChild是对象类型
if (isObjectType(newChild)) { if (isObjectType(newChild)) {
const newVNodes = diffObjectNodeHandler(parentNode, firstChild, newChild, isComparing); const newVNodes = diffObjectNodeHandler(parentNode, firstChild, newChild, firstChild, isComparing);
if (newVNodes) { if (newVNodes) {
return newVNodes; return newVNodes;
} }