text: import React from 'react';
  import Helmet from 'react-helmet';
  
  class PageTitle extends React.Component{
    render(){
      return (
        <Helmet 
          htmlAttributes = {{'lang': 'zh'}} 
          title={this.props.title} 
          meta={[
              {'name': 'test_name', 'content': 'test_content'}
          ]}/>
      );
    }
  }
  export default PageTitle;