修复多店未开启等级会员不显示会员码问题

问题描述：

等级会员未开启时，用户会员码不显示。

解决方法：

pages/users/user_member_code/index.vue，找到这个文件，修改 getlevelInfo 方法。

			getlevelInfo: function() {
				getlevelInfo().then(res => {
					const {
						level_info,
						level_list,
						task,
						user
					} = res.data;
					this.levelInfo = level_info;
					level_list.forEach(item => {
						switch (item.grade) {
							case 1:
								item.background = ['#091D2B', '#000F18'];
								break;
							case 2:
								item.background = ['#131A1D', '#040809'];
								break;
							case 3:
								item.background = ['#4B351C', '#14100C'];
								break;
							case 4:
								item.background = ['#1D172B', '#17151E'];
								break;
							case 5:
								item.background = ['#0F0D07', '#0F0D07'];
								break;
							default:
								break;
						}
					})
					this.VipList = level_list;
					const index = level_list.findIndex(item => item.grade == level_info.grade);
					if (index !== -1) {
						this.currentLevel = level_list[index];
					}
					this.nextLevel = level_list[index + 1];
					this.nowLevel = level_info;
				});
			},