双RelexDOM双花括号错误

Question

什么原因导致此错误？

Syntax error: Unexpected token, expected , 
{ Object.keys(form_routes).map((key,index) => <Route path={key} component={{ form_routes[key] }}></Route>) } 

在{{ form_routes[key] }}

充分相关的代码：

const form_routes = { 
    'start': "Start", 
    'part1': "Part1", 
    'part2': "Part2", 
    'part3': "Part3", 
    'part4': "Part4", 
    'part5': "Part5", 
    'part6': "Part6" 
} 

ReactDOM.render(
    <Provider store={store}> 
     <Router history={hashHistory} render={applyMiddleware(useRelativeLinks())}> 
     <Route path="/" component={App}> 
      <IndexRedirect to='/search'/> 
      <Route path='main' component={MainMenu}/> 
      <Route path='search' component={Search}/> 
      <Route path='form' component={Form}> 
       <IndexRedirect to='start'/> 
       { Object.keys(form_routes).map((key,index) => <Route path={key} component={{ form_routes[key] }}></Route>) } 
      </Route> 
     </Route> 
     </Router> 
    </Provider>, 
    root 
); 

作品如果纯：

<Route path='start' component={Start}></Route> 
<Route path='part1' component={Part1}></Route> 
<Route path='part2' component={Part2}></Route> 
<Route path='part3' component={Part3}></Route> 
<Route path='part4' component={Part4}></Route> 
<Route path='part5' component={Part5}></Route> 
<Route path='part6' component={Part6}></Route> 

Answer 1

component={...}应该包含一个表达式。你给的表达式是{ form_routes[key] }，这是一个无效的对象初始值设定项。这会触发相同的错误：

console.log({ form_routes[key] }); 

您可能只是想要component={ form_routes[key] }。