content: import React, { Component } from 'react';
  import { IndexLink, Link } from 'react-router';
  
  import Subheader from 'material-ui/Subheader';
  import IconButton from 'material-ui/IconButton';
  import NavigationClose from 'material-ui/svg-icons/hardware/keyboard-arrow-left';
  
  import Nav from '../../../components/Nav/Nav';
  
  const style = {
      root: {
          position: 'absolute',
          width: '100%'
      }
  }
  
  class Signal extends Component {
  
      componentWillMount() {
          console.log('I am Signal');
      }
  
      render() {
          return (
              <div style={style.root}>
                  <Nav parentUrl={'/'} parentName={'首页'} nowName={'信号控制'}></Nav>
                  <h1>Signal</h1>
              </div>
          );
      }
  }
  
  export default Signal;