阅读react源码时产生的疑问

Question

今天读react源码有一个地方不太懂(第一次提问，多多指教)疑问在下方调用方法unmountComponent()处

// 卸载组件 
unmountComponent: function() { 
// 设置状态为 UNMOUNTING this._compositeLifeCycleState = CompositeLifeCycle.UNMOUNTING;
 // 如果存在 componentWillUnmount，则触发 
if (this.componentWillUnmount) { this.componentWillUnmount(); } 
// 更新状态为 null
 this._compositeLifeCycleState = null; 
//**下面调用unmountComponent()不会死循环吗**
this._renderedComponent.unmountComponent(); 
this._renderedComponent = null; ReactComponent.Mixin.unmountComponent.call(this); }

Answer 1

看到最新的这个就好理解了，劳烦了~

  unmountComponent: function (safely) {
    if (!this._renderedComponent) {
      return;
    }

    var inst = this._instance;

    if (inst.componentWillUnmount && !inst._calledComponentWillUnmount) {
      inst._calledComponentWillUnmount = true;

      if (safely) {
        var name = this.getName() + '.componentWillUnmount()';
        ReactErrorUtils.invokeGuardedCallback(name, inst.componentWillUnmount.bind(inst));
      } else {
        if ("development" !== 'production') {
          measureLifeCyclePerf(function () {
            return inst.componentWillUnmount();
          }, this._debugID, 'componentWillUnmount');
        } else {
          inst.componentWillUnmount();
        }
      }
    }

    if (this._renderedComponent) {
      ReactReconciler.unmountComponent(this._renderedComponent, safely);
      this._renderedNodeType = null;
      this._renderedComponent = null;
      this._instance = null;
    }

    // Reset pending fields
    // Even if this component is scheduled for another update in ReactUpdates,
    // it would still be ignored because these fields are reset.
    this._pendingStateQueue = null;
    this._pendingReplaceState = false;
    this._pendingForceUpdate = false;
    this._pendingCallbacks = null;
    this._pendingElement = null;

    // These fields do not really need to be reset since this object is no
    // longer accessible.
    this._context = null;
    this._rootNodeID = 0;
    this._topLevelWrapper = null;

    // Delete the reference from the instance to this internal representation
    // which allow the internals to be properly cleaned up even if the user
    // leaks a reference to the public instance.
    ReactInstanceMap.remove(inst);

    // Some existing components rely on inst.props even after they've been
    // destroyed (in event handlers).
    // TODO: inst.props = null;
    // TODO: inst.state = null;
    // TODO: inst.context = null;
  },