基于JavaScript实现评论框展开和隐藏功能

<divclass="nr-comment"><divclass="nr-comment-con"><divclass="nr-comment-nav"><divclass="comment-number"><span>493</span><span>条评论</span></div><divclass="comment-sort">切换为时间排序</div></div><divclass="comment-content"><divclass="com-users"><divclass="comment-user"><span>知乎用户</span><divclass="comment-user-content">这个爬虫真的好强大！</div></div><divclass="comment-time"><div>2017.10.01 21:32:30</div><buttonclass="btn btn-primary btn-sm btn-reply">回复</button></div></div><divclass="user-reply"><duvclass="reply-in"><inputtype="text"value=""name=""placeholder="请输入评论内容" /></duv><divclass="reply-buttons"><buttontype="button"class="btn btn-primary btn-comment btn-sm">评论</button><buttontype="button"class="btn btn-default btn-cancel btn-sm">取消</button></div></div></div><divclass="comment-content"><divclass="com-users"><divclass="comment-user"><span>知乎用户</span><divclass="comment-user-content">这个爬虫真的好强大！</div></div><divclass="comment-time"><div>2017.10.01 21:32:30</div><buttonclass="btn btn-primary btn-sm btn-reply">回复</button></div></div><divclass="user-reply"><duvclass="reply-in"><inputtype="text"value=""name=""placeholder="请输入评论内容" /></duv><divclass="reply-buttons"><buttontype="button"class="btn btn-primary btn-comment btn-sm">评论</button><buttontype="button"class="btn btn-default btn-cancel btn-sm">取消</button></div></div></div><divclass="comment-content"><divclass="com-users"><divclass="comment-user"><span>知乎用户</span><divclass="comment-user-content">这个爬虫真的好强大！</div></div><divclass="comment-time"><div>2017.10.01 21:32:30</div><buttonclass="btn btn-primary btn-sm btn-reply">回复</button></div></div><divclass="user-reply"><duvclass="reply-in"><inputtype="text"value=""name=""placeholder="请输入评论内容" /></duv><divclass="reply-buttons"><buttontype="button"class="btn btn-primary btn-comment btn-sm">评论</button><buttontype="button"class="btn btn-default btn-cancel btn-sm">取消</button></div></div></div><divclass="comment-content"><divclass="com-users"><divclass="comment-user"><span>知乎用户</span><divclass="comment-user-content">这个爬虫真的好强大！</div></div><divclass="comment-time"><div>2017.10.01 21:32:30</div><buttonclass="btn btn-primary btn-sm btn-reply">回复</button></div></div><divclass="user-reply"><duvclass="reply-in"><inputtype="text"value=""name=""placeholder="请输入评论内容" /></duv><divclass="reply-buttons"><buttontype="button"class="btn btn-primary btn-sm btn-comment">评论</button><buttontype="button"class="btn btn-default btn-sm btn-cancel">取消</button></div></div></div><divclass="comment-ipt"><inputtype="text"placeholder="输入你的评论"><buttontype="submit"class="btn btn-sm btn-primary">评论</button></div></div></div>

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