layui关闭弹窗刷新页面

 layer.open({
                                type: 2,
                                area: [‘800px‘,‘750px‘],
                                fix: false,
                                //不固定
                                maxmin: true,
                                shade: 0.3,
                                title: "标题",
                                content: url,
                                btn: [‘关闭‘],
                                // 弹层外区域关闭
                                shadeClose: true,
                                cancel: function(index){
                                    return true;
                                 },
                              end: function(){
                                  //window.history.back(-3);
                                 // window.location.href="/business/exam/onlineExam";
                                  parent.location.reload()
                              }
                            });