详解Vue3中对VDOM的改进

<div>
 <span class="header">I'm header</span>
 <ul>
  <li>第一个静态li</li>
  <li v-for="item in mutableItems" :key="item.key"> {{ item.desc }}</li>
 </ul>
</div>

mutableItems.push({
 key: 'asdf',
 desc: 'a new li item'
})

const _Vue = Vue
const { createVNode: _createVNode } = _Vue

const _hoisted_1 = _createVNode("span", { class: "header" }, "I'm header", -1 / HOISTED /)
const _hoisted_2 = _createVNode("li", null, "第一个静态li", -1 / HOISTED /)

return function render(_ctx, _cache) {
 with (_ctx) {
  const { createVNode: _createVNode, renderList: _renderList, Fragment: _Fragment, openBlock: _openBlock, createBlock: _createBlock, toDisplayString: _toDisplayString } = _Vue

  return (_openBlock(), _createBlock(_Fragment, null, [
   _hoisted_1,
   _createVNode("ul", null, [
    _hoisted_2,
    (_openBlock(true), _createBlock(_Fragment, null, _renderList(state.mutableItems, (item) => {
     return (_openBlock(), _createBlock("li", { key: item.key }, _toDisplayString(item.desc), 1 / TEXT /))
    }), 128 / KEYED_FRAGMENT /))
   ])
  ], 64 / STABLE_FRAGMENT /))
 }
}

const blockStack: (VNode[] | null)[] = []
let currentBlock: VNode[] | null = null
let shouldTrack = 1
// openBlock
export function openBlock(disableTracking = false) {
 blockStack.push((currentBlock = disableTracking ? null : []))
}
export function createBlock(
 type: VNodeTypes | ClassComponent,
 props?: { [key: string]: any } | null,
 children?: any,
 patchFlag?: number,
 dynamicProps?: string[]
): VNode {
 // avoid a block with patchFlag tracking itself
 shouldTrack--
 const vnode = createVNode(type, props, children, patchFlag, dynamicProps)
 shouldTrack++
 // save current block children on the block vnode
 vnode.dynamicChildren = currentBlock || EMPTY_ARR
 // close block
 blockStack.pop()
 currentBlock = blockStack[blockStack.length - 1] || null
 // a block is always going to be patched, so track it as a child of its
 // parent block
 if (currentBlock) {
  currentBlock.push(vnode)
 }
 return vnode
}

// createVNode
function _createVNode(
 type: VNodeTypes | ClassComponent,
 props: (Data & VNodeProps) | null = null,
 children: unknown = null,
 patchFlag: number = 0,
 dynamicProps: string[] | null = null
) {
 /
   一系列代码
 /

 // presence of a patch flag indicates this node needs patching on updates.
 // ponent nodes also should always be patched, because even if the
 // ponent doesn't need to update, it needs to persist the instance on to
 // the next vnode so that it can be properly unmounted later.
 if (
  shouldTrack > 0 &&
  currentBlock &&
  // the EVENTS flag is only for hydration and if it is the only flag, the
  // vnode should not be considered dynamic due to handler caching.
  patchFlag !== PatchFlags.HYDRATE_EVENTS &&
  (patchFlag > 0 ||
   shapeFlag & ShapeFlags.SUSPENSE ||
   shapeFlag & ShapeFlags.STATEFUL_COMPONENT ||
   shapeFlag & ShapeFlags.FUNCTIONAL_COMPONENT)
 ) {
  currentBlock.push(vnode)
 }
}

const result = {
 type: Symbol(Fragment),
 patchFlag: 64,
 children: [
  { type: 'span', patchFlag: -1, ...},
  {
   type: 'ul',
   patchFlag: 0,
   children: [
    { type: 'li', patchFlag: -1, ...},
    {
     type: Symbol(Fragment),
     children: [
      { type: 'li', patchFlag: 1 ...},
      { type: 'li', patchFlag: 1 ...}
     ]
    }
   ]
  }
 ],
 dynamicChildren: [
  {
   type: Symbol(Fragment),
   patchFlag: 128,
   children: [
    { type: 'li', patchFlag: 1 ...},
    { type: 'li', patchFlag: 1 ...}
   ]
  }
 ]
}

function patchElement(n1, n2) {
 let { dynamicChildren } = n2
 // 一系列操作

 if (dynamicChildren) {
  patchBlockChildren (
   n1.dynamicChildren!,
   dynamicChildren,
   el,
   parentComponent,
   parentSuspense,
   areChildrenSVG
  )
 } else if (!optimized) {
  // full diff
  patchChildren(
   n1,
   n2,
   el,
   null,
   parentComponent,
   parentSuspense,
   areChildrenSVG
  )
 }
}