Reactjs 反应：TypeError:existingChildren.set不是函数

我试图在axios的success函数中调用setState，出现以下错误：

Uncaught TypeError: existingChildren.set is not a function
    at mapRemainingChildren (react-dom.development.js:6824)
    at reconcileChildrenArray (react-dom.development.js:7320)
    at reconcileChildFibers (react-dom.development.js:7672)
    at reconcileChildrenAtExpirationTime (react-dom.development.js:7788)
    at reconcileChildren (react-dom.development.js:7771)
    at updateHostComponent (react-dom.development.js:8024)
    at beginWork (react-dom.development.js:8257)
    at performUnitOfWork (react-dom.development.js:10244)
    at workLoop (react-dom.development.js:10308)
    at HTMLUnknownElement.callCallback (react-dom.development.js:540)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:579)
    at invokeGuardedCallback (react-dom.development.js:436)
    at renderRoot (react-dom.development.js:10386)
    at performWorkOnRoot (react-dom.development.js:11000)
    at performWork (react-dom.development.js:10952)
    at requestWork (react-dom.development.js:10861)
    at scheduleWorkImpl (react-dom.development.js:10744)
    at scheduleWork (react-dom.development.js:10706)
    at Object.enqueueSetState (react-dom.development.js:6204)
    at App../node_modules/react/cjs/react.development.js.Component.setState 
 (react.development.js:226)
    at App.js:86
    at <anonymous>

我假设这与我呈现组件的方式有关，而这是导致问题的原因

render() {
    return (
      <div className="app">
        <Header />
        <BreadCrumb
          data={this.state.breadCrumb}
          setCountryView={this.setCountryView.bind(this)}
        />
        <Switch>
          <Route
            exact
            path="/"
            component={() =>
              <Home
                setMapView={this.setMapView.bind(this)}
                mapData={this.state.mapData}
              />}
          />
          <Route path="/country/:country" component={Country} />
        </Switch>
      </div>
    );

render（）{
返回(
}
/>
);

---

非常感谢您的建议。

将

then（函数（响应）{

更改为

then（响应）{

我仍然会得到相同的错误..箭头函数只是一个语法糖，对吧？没有箭头函数会改变

这个

得到边界的方式也很抱歉，刚刚注意到您的

绑定（这个）

更改

（函数（response）{

到

然后（response=>{

仍然我得到了相同的错误..箭头函数只是一个语法糖，对吗？没有箭头函数改变

这个

得到边界的方式也很抱歉，只是注意到了你的

.bind（this）

render() {
    return (
      <div className="app">
        <Header />
        <BreadCrumb
          data={this.state.breadCrumb}
          setCountryView={this.setCountryView.bind(this)}
        />
        <Switch>
          <Route
            exact
            path="/"
            component={() =>
              <Home
                setMapView={this.setMapView.bind(this)}
                mapData={this.state.mapData}
              />}
          />
          <Route path="/country/:country" component={Country} />
        </Switch>
      </div>
    );