var mountOrder = 1;
export function Component(instance, vnode) {
    //防止用户在构造器生成JSX
   
    this._mountOrder = mountOrder++;
    this._instance = instance;
    this.__pendingCallbacks = [];
    this.__pendingStates = [];
    this._currentElement = vnode;
    this.__lifeStage = 0; //判断生命周期
}