React

React.Element

{
“$$typeof”: Symbol(reactType),
“key”:null,
“ref”:null,
“type”: constructor,
“props”:{},
“_owner”:null,
“_self”: null,
“_store”:{},
“_source”: {},
“_store”: {},
}

ReactDOM.render

call: legacyRenderSubtreeIntoContainer
判断是合法container

!!(node && (node.nodeType === ELEMENT_NODE || node.nodeType === DOCUMENT_NODE || node.nodeType === DOCUMENT_FRAGMENT_NODE || node.nodeType === COMMENT_NODE && node.nodeValue === ' react-mount-point-unstable '))

call: legacyCreateRootFromDOMContainer // root = container._reactRootContainer = legacyCreateRootFromDOMContainer(container, forceHydrate);

new ReactRoot
call createContainer
call createFiberRoot
call createHostRootFiber
call createFiber
new FiberNode
goto legacyRenderSubtreeIntoContainer // 回到legacyRenderSubtreeIntoContainer继续执行
call unbatchedUpdates
root.render
new ReactWork
call updateContainer
call updateContainerAtExpirationTime
call getContextForSubtree
call scheduleRootUpdate
call createUpdate