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访问报<Router> may have only one child element错误

2

11:40 Uncaught Error: A may have only one child element at invariant (11:40) at Router.componentWillMount (95:72) at eval (412:347) at measureLifeCyclePerf (412:75) at ReactCompositeComponentWrapper.performInitialMount (412:346) at ReactCompositeComponentWrapper.mountComponent (412:257) at Object.mountComponent...