detail.jsx文件import React from 'react'import DetailHeader from '../components/detail-header.jsx'import DetailContent from '../components/detail-content.jsx'import { connect } from 'react-redux'const detail = React.createClass({  render() {    let id  = this.props.params.id    return (      <div className="container">        <DetailHeader id={id}/>        <DetailContent id={id}/>        **{this.props.children}**      </div>    )  }})export default detailthis.props.children在這里指的是什么呢