交换式企业网络主要是通过交换机进行数据之间传输，但要跨越到外网，也离不开路由器的加持 

设计技术：VLAN、STP、单臂路由、HSRP、静态路由、NAT、ACL 、GRE 、PPP

拓扑搭建

 设备的扩展

在二层设备AS-1、AS-2、AS-3配置VLAN、VTP

Switch>enable 
Switch#configure 
Switch(config)#hostname AS-1
AS-1(config)#vlan 10
AS-1(config-vlan)#vlan 20
AS-1(config-vlan)#vlan 30
AS-1(config-vlan)#vlan 40
AS-1(config-vlan)#vlan 99
AS-1(config-vlan)#exit
AS-1(config)#vtp mode server 
AS-1(config)#vtp version 2
AS-1(config)#vtp domain CCNA
AS-1(config)#vtp password cisco

Switch>enable 
Switch#configure 
Switch(config)#hostname AS-2
AS-2(config)#vtp mode client 
AS-2(config)#vtp domain CCNA
Changing VTP domain name from NULL to CCNA
AS-2(config)#vtp password cisco

Switch>enable 
Switch#configure 
Switch(config)#hostname AS-3
AS-3(config)#vtp mode client 
AS-3(config)#vtp domain CCNA
AS-3(config)#vtp password cisco

查看VTP状态

二层设备AS-1、AS-2、AS-3配置VLAN接口、管理IP、网关

AS-1(config)#interface range gigabitEthernet 0/1-2
AS-1(config-if-range)#switchport mode trunk 
AS-1(config-if-range)#switchport trunk allowed vlan 10,20,30,40,99
AS-1(config-if-range)#exit
AS-1(config)#interface vlan 99
AS-1(config-if)#ip address 10.1.99.1 255.255.255.0
AS-1(config-if)#no shutdown 
AS-1(config-if)#exit
AS-1(config)#ip default-gateway 10.0.99.254
AS-1(config)#interface fastEthernet 0/1
AS-1(config-if)#switchport mode access 
AS-1(config-if)#switchport access vlan 10
AS-1(config-if)#exit
AS-1(config)#interface fastEthernet 0/2
AS-1(config-if)#switchport mode access 
AS-1(config-if)#switchport access vlan 20
AS-1(config-if)#exit
AS-1(config)#interface fastEthernet 0/3
AS-1(config-if)#switchport mode access 
AS-1(config-if)#switchport access vlan 30
AS-1(config-if)#exit
AS-1(config)#interface fastEthernet 0/4
AS-1(config-if)#switchport mode access 
AS-1(config-if)#switchport access vlan 40
AS-1(config-if)#exit

AS-3(config)#interface range gigabitEthernet 0/1-2
AS-3(config-if-range)#switchport mode trunk 
AS-3(config-if-range)#switchport trunk allowed vlan 10,20,30,40,99
AS-3(config-if-range)#exit
AS-3(config)#interface vlan 99
AS-3(config-if)#ip address 10.0.99.3 255.255.255.0
AS-3(config-if)#exit
AS-3(config)#ip default-gateway 10.0.99.254
AS-3(config)#interface fastEthernet 0/1
AS-3(config-if)#switchport mode access 
AS-3(config-if)#switchport access vlan 10
AS-3(config-if)#exit
AS-3(config)#interface fastEthernet 0/2
AS-3(config-if)#switchport mode access 
AS-3(config-if)#switchport access vlan 20
AS-3(config-if)#exit
AS-3(config)#interface fastEthernet 0/3
AS-3(config-if)#switchport mode access 
AS-3(config-if)#switchport access vlan 30
AS-3(config-if)#exit
AS-3(config)#interface fastEthernet 0/4
AS-3(config-if)#switchport mode access 
AS-3(config-if)#switchport access vlan 40
AS-3(config-if)#exit

二层设备AS-4、AS-5配置VLAN、Trunk

Switch>enable 
Switch#configure 
Switch(config)#hostname AS-4
AS-4(config)#interface range fastEthernet 0/23-24,g0/1
AS-4(config-if-range)#switchport mode trunk 

AS-4(config-if-range)#switchport trunk allowed vlan 4,5,6,7
AS-4(config-if-range)#exit
AS-4(config)#vlan 4
AS-4(config-vlan)#vlan 5
AS-4(config-vlan)#vlan 6
AS-4(config-vlan)#vlan 7
AS-4(config-vlan)#exit
AS-4(config)#interface gigabitEthernet 0/1
AS-4(config-if)#switchport mode trunk 
AS-4(config-if)#switchport trunk allowed vlan 4,5,6,7
AS-4(config-if)#exit
AS-4(config)#interface fastEthernet 0/1
AS-4(config-if)#switchport mode access 
AS-4(config-if)#switchport access vlan 5
AS-4(config-if)#exit
AS-4(config)#interface fastEthernet 0/2
AS-4(config-if)#switchport mode access 
AS-4(config-if)#switchport access vlan 6
AS-4(config-if)#exit
AS-4(config)#interface gigabitEthernet 0/2
AS-4(config-if)#switchport mode access 
AS-4(config-if)#switchport access vlan 7
AS-4(config-if)#exit
AS-4(config)#interface vlan 4
AS-4(config-if)#ip address 10.8.4.1 255.255.255.0
AS-4(config-if)#no shutdown 
AS-4(config-if)#exit
AS-4(config)#ip default-gateway 10.8.4.254

Switch>enable 
Switch#conf
Switch(config)#hostname AS-5
AS-5(config)#interface range fastEthernet 0/23-24
AS-5(config-if-range)#switchport mode trunk 
AS-5(config-if-range)#switchport trunk allowed vlan 4,5,6,7
AS-5(config-if-range)#vlan 4
AS-5(config-vlan)#vlan 5
AS-5(config-vlan)#vlan 6
AS-5(config-vlan)#vlan 7
AS-5(config-vlan)#exit
AS-5(config)#interface fastEthernet 0/1
AS-5(config-if)#switchport mode access 
AS-5(config-if)#switchport access vlan 5
AS-5(config-if)#exit
AS-5(config)#interface fastEthernet 0/2
AS-5(config-if)#switchport mode access 
AS-5(config-if)#switchport access vlan 6
AS-5(config-if)#exit
AS-5(config)#interface vlan 4
AS-5(config-if)#ip address 10.8.4.2 255.255.255.0
AS-5(config-if)#no shutdown 
AS-5(config-if)#exit
AS-5(config)#ip default-gateway 10.8.4.254

配置三层设备DS-1、DS-2

Switch>enable 
Switch#configure 
Switch(config)#hostname DS-1
DS-1(config)#ip routing
DS-1(config)#interface gigabitEthernet 1/0/2
DS-1(config-if)#no switchport 
DS-1(config-if)#ip address 10.0.13.1 255.255.255.0
DS-1(config-if)#exit
DS-1(config)#interface gigabitEthernet 1/0/1
DS-1(config-if)#switchport mode trunk 
DS-1(config-if)#switchport trunk allowed vlan 10,20,30,40,99
DS-1(config-if)#exit
DS-1(config)#vlan 10
DS-1(config-vlan)#vlan 20
DS-1(config-vlan)#vlan 30
DS-1(config-vlan)#vlan 40
DS-1(config-vlan)#vlan 99
DS-1(config-vlan)#exit
DS-1(config)#interface vlan 99
DS-1(config-if)#ip address 10.1.10.253 255.255.255.0
DS-1(config-if)#exit
DS-1(config)#interface vlan 20
DS-1(config-if)#ip address 10.2.20.253 255.255.255.0
DS-1(config-if)#exit
DS-1(config)#interface vlan 30
DS-1(config-if)#ip address 10.3.30.253 255.255.255.0
DS-1(config-if)#exit
DS-1(config)#interface vlan 40
DS-1(config-if)#ip address 10.4.40.253 255.255.255.0
DS-1(config-if)#exit
DS-1(config)#interface vlan 99
DS-1(config-if)#ip address 10.0.99.253 255.255.255.0
DS-1(config-if)#exit
DS-1(config)#interface vlan 10
DS-1(config-if)#ip address 10.1.10.253 255.255.255.0
DS-1(config-if)#exit
DS-1(config)#interface loopback 0
DS-1(config-if)#ip address 10.1.1.1 255.255.255.255

Switch>enable 
Switch#configure 
Switch(config)#hostname DS-2
DS-2(config)#ip routing
DS-2(config)#interface gigabitEthernet 1/0/2
DS-2(config-if)#no switchport 
DS-2(config-if)#ip address 10.0.23.2 255.255.255.0	
DS-2(config-if)#exit
DS-2(config)#interface gigabitEthernet 1/0/1
DS-2(config-if)#switchport mode trunk 
DS-2(config-if)#switchport trunk allowed vlan 10,20,30,40,99
DS-2(config-if)#exit
DS-2(config)#vlan 10
DS-2(config-vlan)#vlan 20
DS-2(config-vlan)#vlan 30
DS-2(config-vlan)#vlan 40
DS-2(config-vlan)#vlan 99
DS-2(config-vlan)#exit
DS-2(config)#interface vlan 10
DS-2(config-if)#ip address 10.1.10.252 255.255.255.0
DS-2(config-if)#exit
DS-2(config)#interface vlan 20
DS-2(config-if)#ip address 10.2.20.252 255.255.255.0
DS-2(config-if)#exit
DS-2(config)#interface vlan 30
DS-2(config-if)#ip address 10.3.30.252 255.255.255.0
DS-2(config-if)#exit
DS-2(config)#interface vlan 40
DS-2(config-if)#ip address 10.4.40.252 255.255.255.0
DS-2(config-if)#exit
DS-2(config)#interface vlan 99
DS-2(config-if)#ip address 10.0.99.252 255.255.255.0
DS-2(config-if)#exit
DS-2(config)#interface loopback 0
DS-2(config-if)#ip address 10.2.2.2 255.255.255.255

路由配置

Router>enable 
Router#configure 
Router(config)#hostname R-Edge
R-Edge(config)#exit
R-Edge#vlan database 
% Warning: It is recommended to configure VLAN from config mode,
  as VLAN database mode is being deprecated. Please consult user
  documentation for configuring VTP/VLAN in config mode.

R-Edge(vlan)#vlan 100
VLAN 100 added:
    Name: VLAN0100
R-Edge(vlan)#vlan 200
VLAN 200 added:
    Name: VLAN0200
R-Edge(vlan)#exit
APPLY completed.
Exiting....
R-Edge#configure 
R-Edge(config)#interface range gigabitEthernet 0/1/0-1
R-Edge(config-if-range)#switchport mode access 
R-Edge(config-if-range)#switchport access vlan 100
R-Edge(config-if-range)#exit
R-Edge(config)#interface range gigabitEthernet 0/1/2-3
R-Edge(config-if-range)#switchport mode access 
R-Edge(config-if-range)#switchport access vlan 200
R-Edge(config-if-range)#exit
R-Edge(config)#interface serial 0/2/0
R-Edge(config-if)#ip address 218.12.17.1 255.255.255.252
R-Edge(config-if)#no shutdown 
R-Edge(config-if)#exit
R-Edge(config)#interface gigabitEthernet 0/0/0
R-Edge(config-if)#ip address 10.0.13.3 255.255.255.0
R-Edge(config-if)#no shutdown 
R-Edge(config-if)#exit
R-Edge(config)#interface gigabitEthernet 0/0/1
R-Edge(config-if)#ip address 10.0.23.3 255.255.255.0
R-Edge(config-if)#no shutdown 
R-Edge(config-if)#exit
R-Edge(config)#interface loopback 0
R-Edge(config-if)#ip address 10.3.3.3 255.255.255.255
R-Edge(config-if)#exit
R-Edge(config)#interface vlan 10
R-Edge(config-if)#exit
R-Edge(config)#interface vlan 100
R-Edge(config-if)#ip address 10.5.100.254 255.255.255.0
R-Edge(config-if)#exit
R-Edge(config)#interface vlan 200
R-Edge(config-if)#ip address 10.6.200.254 255.255.255.0
R-Edge(config-if)#exit

Router>enable 
Router#configure 
Router(config)#hostname ISP
ISP(config)#interface serial 0/0/0
ISP(config-if)#ip address 218.12.17.2 255.255.255.252
ISP(config-if)#clock rate 128000
ISP(config-if)#no shutdown 
ISP(config-if)#exit
ISP(config)#interface gigabitEthernet 0/2/0
ISP(config-if)#ip address 218.12.18.2 255.255.255.252
ISP(config-if)#no shutdown 
ISP(config-if)#exit
ISP(config)#interface loopback 0
ISP(config-if)#ip address 200.200.200.200 255.255.255.255
ISP(config-if)#exit

在DS-1、DS-2上配置HSRP

DS-1(config-if)#standby 10 ip 10.1.10.254
DS-1(config-if)#standby 10 priority 105
DS-1(config-if)#standby 10 preempt 
DS-1(config-if)#standby 10 track gigabitEthernet 1/0/2
DS-1(config-if)#exit
DS-1(config)#interface vlan 20
DS-1(config-if)#standby 20 ip 10.2.20.254
DS-1(config-if)#standby 20 pree
DS-1(config-if)#standby 20 preempt 
DS-1(config-if)#exit
DS-1(config)#interface vlan 30
DS-1(config-if)#standby 30 ip 10.3.30.254
DS-1(config-if)#standby 30 preempt 
DS-1(config-if)#standby 30 track gigabitEthernet 1/0/2
DS-1(config-if)#exit
DS-1(config)#interface vlan 40
DS-1(config-if)#standby 40 ip 10.4.40.254
DS-1(config-if)#standby 40 preempt 
DS-1(config-if)#exit
DS-1(config)#interface vlan 99
DS-1(config-if)#standby 99 ip 10.0.99.254
DS-1(config-if)#standby 99 priority 105
DS-1(config-if)#standby 99 track gigabitEthernet 1/0/2
DS-1(config-if)#no shutdown 
DS-1(config-if)#exit

DS-2(config)#interface vlan 10
DS-2(config-if)#standby 10 ip 10.1.10.254
DS-2(config-if)#standby 10 preempt 
DS-2(config-if)#exit
DS-2(config)#interface vlan 20
DS-2(config-if)#standby 20 ip 10.2.20.254
DS-2(config-if)#standby 20 priority 105
DS-2(config-if)#standby 20 preempt 
DS-2(config-if)#standby 20 track gigabitEthernet 1/0/2
DS-2(config-if)#exit
DS-2(config)#interface vlan 30
DS-2(config-if)#standby 30 ip 10.3.30.254
DS-2(config-if)#standby 30 preempt 
DS-2(config-if)#exit
DS-2(config)#interface vlan 40
DS-2(config-if)#standby 40 ip 10.4.40.254
DS-2(config-if)#standby 40 priority 105
DS-2(config-if)#standby 40 preempt 
DS-2(config-if)#standby 40 track gigabitEthernet 1/0/2
DS-2(config-if)#exit
DS-2(config)#interface vlan 99
DS-2(config-if)#standby 99 ip 10.0.99.254 
DS-2(config-if)#standby 99 preempt 

配置生成树PVST

AS-4(config)#spanning-tree mode pvst 
AS-4(config)#spanning-tree vlan 4,5 root primary 
AS-4(config)#spanning-tree vlan 6,7 root secondary 

AS-5(config)#spanning-tree mode pvst 
AS-5(config)#spanning-tree vlan 4,5 root primary 
AS-5(config)#spanning-tree vlan 6,7 root secondary

L-Router上配置单臂路由

Router>enable 
Router#configure 
Router(config)#hostname L-Router
L-Router(config)#interface gigabitEthernet 0/0
L-Router(config-if)#no shutdown 
L-Router(config-if)#no ip address 
L-Router(config)#interface gigabitEthernet 0/0.4
L-Router(config-subif)#encapsulation dot1Q 4
L-Router(config-subif)#ip address 10.8.4.254 255.255.255.0
L-Router(config-subif)#exit
L-Router(config)#interface gigabitEthernet 0/0.5
L-Router(config-subif)#encapsulation dot1Q 5
L-Router(config-subif)#ip address 10.8.5.254 255.255.255.0
L-Router(config-subif)#exit
L-Router(config)#interface gigabitEthernet 0/0.6
L-Router(config-subif)#encapsulation dot1Q 6
L-Router(config-subif)#ip address 10.8.6.254 255.255.255.0
L-Router(config-subif)#exit
L-Router(config)#interface gigabitEthernet 0/0.7
L-Router(config-subif)#encapsulation dot1Q 7
L-Router(config-subif)#ip address 10.8.7.254 255.255.255.0
L-Router(config-subif)#exit
L-Router(config)#interface gigabitEthernet 0/0/0
L-Router(config-if)#ip address 218.12.8.1 255.255.255.252
L-Router(config-if)#no shutdown 
L-Router(config-if)#exit

DS-1、DS-2上配置DHCP服务

DS-1(config)#ip dhcp pool VLAN10
DS-1(dhcp-config)#network 10.1.10.0 255.255.255.0
DS-1(dhcp-config)#default-router 10.1.10.254
DS-1(dhcp-config)#dns-server 10.5.100.252
DS-1(dhcp-config)#exit
DS-1(config)#ip dhcp pool VLAN20
DS-1(dhcp-config)#network 10.2.20.0 255.255.255.0
DS-1(dhcp-config)#default-router 10.2.20.254
DS-1(dhcp-config)#dns-server 10.5.100.252
DS-1(dhcp-config)#exit
DS-1(config)#ip dhcp pool VLAN30
DS-1(dhcp-config)#network 10.3.30.0 255.255.255.0
DS-1(dhcp-config)#default-router 10.3.30.254
DS-1(dhcp-config)#dns-server 10.5.100.252
DS-1(dhcp-config)#exit
DS-1(config)#ip dhcp pool VLAN40
DS-1(dhcp-config)#network 10.4.40.0 255.255.255.0
DS-1(dhcp-config)#default-router 10.4.40.254
DS-1(dhcp-config)#dns-server 10.5.100.252
DS-1(dhcp-config)#exit
DS-1(config)#ip dhcp excluded-address 10.1.10.101 10.1.10.254
DS-1(config)# no ip dhcp excluded-address 10.1.10.101 10.1.10.254
DS-1(config)#ip dhcp excluded-address 10.1.10.99 10.1.10.254
DS-1(config)#ip dhcp excluded-address 10.2.20.99 10.2.20.254
DS-1(config)#ip dhcp excluded-address 10.3.30.99 10.3.30.254
DS-1(config)#ip dhcp excluded-address 10.4.40.99 10.4.40.254

DS-2(config)#ip dhcp pool VLAN10
DS-2(dhcp-config)#network 10.1.10.0 255.255.255.0
DS-2(dhcp-config)#default-router 10.1.10.254
DS-2(dhcp-config)#dns-server 10.5.100.252
DS-2(dhcp-config)#exit
DS-2(config)#ip dhcp pool VLAN20
DS-2(dhcp-config)#network 10.2.20.0 255.255.255.0
DS-2(dhcp-config)#default-router 10.2.20.254
DS-2(dhcp-config)#dns-server 10.5.100.252
DS-2(dhcp-config)#exit
DS-2(config)#ip dhcp pool VLAN30
DS-2(dhcp-config)#network 10.3.30.0 255.255.255.0
DS-2(dhcp-config)#default-router 10.3.30.254
DS-2(dhcp-config)#dns-server 10.5.100.252
DS-2(dhcp-config)#exit
DS-2(config)#ip dhcp pool VLAN40
DS-2(dhcp-config)#network 10.4.40.0 255.255.255.0
DS-2(dhcp-config)#default-router 10.3.30.254
DS-2(dhcp-config)#no de
DS-2(dhcp-config)#no default-router 10.3.30.254
DS-2(dhcp-config)#default-router 10.4.40.254
DS-2(dhcp-config)#dns-server 10.5.100.252
DS-2(dhcp-config)#exit

L-Router配置DHCP中继

L-Router(config)#interface gigabitEthernet 0/0.5
L-Router(config-subif)#ip helper-address 10.8.7.253
L-Router(config-subif)#exit
L-Router(config)#interface gigabitEthernet 0/0.6
L-Router(config-subif)#ip helper-address 10.8.7.253

添加静态静态路由

R-Edge(config)#ip route 10.0.0.0 255.248.0.0 10.0.13.1
R-Edge(config)#ip route 10.0.0.0 255.248.0.0 10.0.23.2
R-Edge(config)#ip route 0.0.0.0 0.0.0.0 serial 0/2/0

L-Router(config)#ip route 0.0.0.0 0.0.0.0 218.12.8.2

DS-1(config)#ip route 0.0.0.0 0.0.0.0 10.0.13.3

DS-2(config)#ip route 0.0.0.0 0.0.0.0 10.0.23.3

R-Edge、L-Router配置NAT

R-Edge(config)#ip access-list standard 1
R-Edge(config-std-nacl)#permit 10.0.0.0 0.7.255.255
R-Edge(config-std-nacl)#exit
R-Edge(config)#ip nat inside source list 1 interface serial 0/2/0
R-Edge(config)#ip nat inside source static tcp 10.5.100.253 80 218.12.17.1 80
R-Edge(config)#interface gigabitEthernet 0/0/0
R-Edge(config-if)#ip nat inside 
R-Edge(config-if)#exit
R-Edge(config)#interface gigabitEthernet 0/0/1
R-Edge(config-if)#ip nat inside 
R-Edge(config-if)#exit
R-Edge(config)#interface vlan 100
R-Edge(config-if)#ip nat inside 
R-Edge(config-if)#exit
R-Edge(config)#interface vlan 200
R-Edge(config-if)#ip nat inside 
R-Edge(config-if)#exit
R-Edge(config)#interface serial 0/2/0
R-Edge(config-if)#ip nat outside 
R-Edge(config-if)#exit

L-Router(config)#ip nat inside source list 2 interface gigabitEthernet 0/0/0 overload 
L-Router(config)#interface gigabitEthernet 0/0/0
L-Router(config-if)#ip nat outside 
L-Router(config-if)#exit
L-Router(config)#interface gigabitEthernet 0/0.4
L-Router(config-subif)#ip nat inside 
L-Router(config-subif)#exit
L-Router(config)#interface gigabitEthernet 0/0.5
L-Router(config-subif)#ip nat inside 
L-Router(config-subif)#exit
L-Router(config)#interface gigabitEthernet 0/0.6
L-Router(config-subif)#ip nat inside 
L-Router(config-subif)#exit
L-Router(config)#interface gigabitEthernet 0/0.7
L-Router(config-subif)#ip nat inside 
L-Router(config-subif)#exit

配置PPP协议CHAP认证

R-Edge(config)#username ISP password cisco
R-Edge(config)#interface serial 0/2/0
R-Edge(config-if)#encapsulation ppp
R-Edge(config-if)#ppp authentication chap

ISP(config)#username R-Edge password cisco
ISP(config)#interface serial 0/0/0
ISP(config-if)#encapsulation ppp
ISP(config-if)#ppp authentication chap

配置GRE 

R-Edge(config)#interface tunnel 10
R-Edge(config-if)#ip address 10.10.10.1 
R-Edge(config-if)#ip address 10.10.10.1 255.255.255.252
R-Edge(config-if)#tunnel source serial 0/2/0

L-Router(config)#interface tunnel 10
L-Router(config-if)#ip address 10.10.10.2 255.255.255.252
L-Router(config-if)#tunnel source gigabitEthernet 0/0/0
L-Router(config-if)#tunnel destination 218.12.17.1

R-Edge(config)#ip route 10.8.4.0 255.255.255.0 10.10.10.2
R-Edge(config)#ip route 10.8.5.0 255.255.255.0 10.10.10.2
R-Edge(config)#ip route 10.8.6.0 255.255.255.0 10.10.10.2
R-Edge(config)#ip route 10.8.7.0 255.255.255.0 10.10.10.2

L-Router(config)#ip route 10.0.0.0 255.248.0.0 10.10.10.1

DHCP、DNS、FTP

依次使用PC的DHCP，自动获取IP

 任意的连通性测试

注意：我们在路由器上是做了ACL的

 PC61 访问WEB服务器

 我们测试完连接性，我们还可以配置一下远程访问控制

DS-1、DS-2上配置Telnet

DS-1(config)#enable secret cisco
DS-1(config)#username admin secret cisco
DS-1(config)#line vty 0 5
DS-1(config-line)#transport input telnet 
DS-1(config-line)#login local 

S-2(config)#enable secret cisoc
DS-2(config)#username admin secret cisco
DS-2(config)#line vty 0 5
DS-2(config-line)#transport input telnet 
DS-2(config-line)#login local 

AS-1 AS-2 AS-3上配置Telnet

AS-1(config)#enable secret cisco
AS-1(config)#username admin secret cisco
AS-1(config)#line vty 0 5
AS-1(config-line)#transport input telnet 
AS-1(config-line)#login local 

AS-2、AS-3后面路由器都是同样的操作！！

测试远程登录

 那后边的也是可以这样测试。登录的时候我们是配置环回地址的，所以我们登录对应的换环回就行了

OK，这个项目大概就是这样了，还可以叫很多东西在上面，大家可以自己尝试一下哦！