```python
class ShoppingCart:
def __init__(self):
self.items = []
def add_item(self, item):
self.items.append(item)
def remove_item(self, item):
if item in self.items:
self.items.remove(item)
def display_cart(self):
if not self.items:
print("购物车为空。")
else:
print("购物车中的商品：")
for index, item in enumerate(self.items, start=1):
print(f"{index
