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排错

如何获得上一次路径？

js

<Route component={App}>
  {/* ... 其它 route */}
</Route>

const App = React.createClass({
  getInitialState() {
    return { showBackButton: false }
  },

  componentWillReceiveProps(nextProps) {
    const routeChanged = nextProps.location !== this.props.location
    this.setState({ showBackButton: routeChanged })
  }
})