text: import React from 'react'
  import PropTypes from "prop-types";
  export default class VoteFooter extends React.Component{
      static contextTypes={
          callBack:PropTypes.func
      }
      constructor(props,context){
          super(props,context)
      }
      render(){
          let {callBack} = this.context
          return(
              <div className="panel-footer">
                  <button className="btn btn-success" onClick={()=>{callBack('support')}}>支持</button>
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                  <button className="btn btn-danger" onClick={()=>{callBack('against')}}>反对</button>
              </div>
          )
      }
  }
  