概览

源码解析

function createRenderer(options){
  return baseCreateRenderer(options)
}

function baseCreateRenderer(options,createHydrationFns){
  const target = shared.getGlobalThis();
  target.__VUE__ = true;
  let isFlushing = false;
  const render=(vnode,container,namespace)=>{
   if(vnode == null){
     if(container._vnode){
       unmount(container._vnode,null,null,true) 
     }    
   }else{
     patch(container._vnode||null,vnode,container,null,null,null,namespace)
   }
   container._vnode = vnode;
   if(!isFlushing){
      isFlushing = true;
      flushPreFlushCbs();
      flushPostFlushCbs();
      isFlushing = false;  
   }
  }

  return {
    render,
    hydrate,
    createApp:createAppAPI(render,hydrate)
  }
}