init (graduate from prototype)

packages/runtime-dom/src/modules/props.ts

@@ -0,0 +1,18 @@
+import { VNode, ChildrenFlags } from '@vue/core'
+
+export function patchDOMProp(
+  el: any,
+  key: string,
+  value: any,
+  prevVNode: VNode,
+  unmountChildren: any
+) {
+  if (key === 'innerHTML' || key === 'textContent') {
+    if (prevVNode && prevVNode.children) {
+      unmountChildren(prevVNode.children, prevVNode.childFlags)
+      prevVNode.children = null
+      prevVNode.childFlags = ChildrenFlags.NO_CHILDREN
+    }
+  }
+  el[key] = value
+}