修复bug

center/orderdetails.vue

@@ -726,8 +726,8 @@
 			rebook(){
 				uni.$u.route('pages/ticketlist',{performId:this.orderDetails.performId,orderId:this.orderDetails.id,fromPage:'rebook'})
 			},
-			upgrade(item){
-				uni.$u.route('pages/ticketlist',{performId:item.orderDetails.performId,orderId:item.orderDetails.id,fromPage:'rebook',isUpgrade:true})
+			upgrade(){
+				uni.$u.route('pages/ticketlist',{performId:this.orderDetails.performId,orderId:this.orderDetails.id,fromPage:'rebook',isUpgrade:true})
 			},
 			// 显示退款信息弹窗
 			showRefundInfoPopup(item) {