Tungsten Fabric知识库丨测试2000个vRouter节点部署
时间:2022-07-25
本文章向大家介绍Tungsten Fabric知识库丨测试2000个vRouter节点部署，主要内容包括其使用实例、应用技巧、基本知识点总结和需要注意事项，具有一定的参考价值，需要的朋友可以参考一下。
作者：Tatsuya Naganawa 译者：TF编译组
原文链接：
https://github.com/tnaganawa/tungstenfabric-docs/blob/master/TungstenFabricKnowledgeBase.md
由于GCP允许启动多达5k个节点:)，因此vRouter的规模测试程序主要针对该平台来介绍。
·话虽如此，AWS也可以使用相同的程序
第一个目标是2k个vRouter节点，但是据我尝试，这不是最大值，可以通过更多的控制节点或添加CPU/MEM来达到更大的数值。
在GCP中，可以使用多个子网创建VPC，将控制平面节点分配为172.16.1.0/24，而vRouter节点分配为10.0.0.0/9。（默认子网为/12，最多可达到4k个节点）
默认情况下，并非所有实例都可以具有全局IP，因此需要为vRouter节点定义Cloud NAT才能访问Internet。（我将全局IP分配给控制平面节点，因为节点数量不会那么多）
所有节点均由instance-group创建，并且禁用了auto-scaling，并分配了固定编号。所有节点都为了降低成本而配置了抢占模式（vRouter为$0.01/1hr（n1-standard-1），控制平面节点为$0.64/1hr（n1-standard-64））
总体程序描述如下：
1.使用此程序设置control/config x 5，analytics x 3，kube-master x 1。
这一步最多需要30分钟。
使用了2002版本。JVM_EXTRA_OPTS：设置为“-Xms128m -Xmx20g”。
需要补充一点的是，XMPP_KEEPALIVE_SECONDS决定了XMPP的可扩展性，我将其设置为3。因此，在vRouter节点故障之后，control组件需要9秒才能识别出它来。（默认情况下设置为10/30）对于IaaS用例，我认为这是一个中等的选择，但如果这个值需要较低，则需要有更多的CPU。
为了后续使用，这里还创建了虚拟网络vn1（10.1.0.0/12，l2/l3）。
·https://github.com/tnaganawa/tungctl/blob/master/samples.yaml#L3
2.使用此程序设置一个kube-master。
·https://github.com/tnaganawa/tungstenfabric-docs/blob/master/TungstenFabricPrimer.md#kubeadm
这一步最多需要20分钟。
对于cni.yaml，使用以下URL。
XMPP_KEEPALIVE_SECONDS：“3”已经添加到env中。
由于GCP上的vRouter问题，
vrouter-agent容器已打补丁，并且yaml需要更改。
- name: contrail-vrouter-agent
image: "tnaganawa/contrail-vrouter-agent:2002-latest" ### 这一行改变了set-label.sh和kubectl apply -f cni.yaml此时已完成。
3.启动vRouter节点，并使用以下命令转储ips。
(for GCP)
gcloud --format="value(networkInterfaces[0].networkIP)" compute instances list
(for AWS, this command can be used)
aws ec2 describe-instances --query 'Reservations[*].Instances[*].PrivateIpAddress' --output text | tr 't' 'n' 这大约需要10-20分钟。
4.在vRouter节点上安装Kubernetes，然后等待它安装vRouter节点。
(/tmp/aaa.pem is the secret key for GCP)
sudo yum -y install epel-release
sudo yum -y install parallel
sudo su - -c "ulimit -n 8192; su - centos"
cat all.txt | parallel -j3500 scp -i /tmp/aaa.pem -o StrictHostKeyChecking=no install-k8s-packages.sh centos@{}:/tmp
cat all.txt | parallel -j3500 ssh -i /tmp/aaa.pem -o StrictHostKeyChecking=no centos@{} chmod 755 /tmp/install-k8s-packages.sh
cat all.txt | parallel -j3500 ssh -i /tmp/aaa.pem -o StrictHostKeyChecking=no centos@{} sudo /tmp/install-k8s-packages.sh
### 该命令需要最多200个并行执行，如果不执行该命令，会导致kubeadm连接超时
cat all.txt | parallel -j200 ssh -i /tmp/aaa.pem -o StrictHostKeyChecking=no centos@{} sudo kubeadm join 172.16.1.x:6443 --token we70in.mvy0yu0hnxb6kxip --discovery-token-ca-cert-hash sha256:13cf52534ab14ee1f4dc561de746e95bc7684f2a0355cb82eebdbd5b1e9f3634kubeadm加入大约需要20-30分钟。vRouter安装大约需要40-50分钟。（基于Cloud NAT性能，在VPC中添加docker注册表会缩短docker pull time）。
5.之后，可以使用replica: 2000创建first-containers.yaml，并检查容器之间的ping。要查看BUM行为，vn1也可以与具有2k replica的容器一起使用。
·https://github.com/tnaganawa/tungstenfabric-docs/blob/master/8-leaves-contrail-config.txt#L99
创建容器最多需要15-20分钟。
[config results]
2200 instances are created, and2188 kube workers are available.
(some are restarted andnot available, since those instance are preemptive VM)
[centos@instance-group-1-srwq ~]$ kubectl get node | wc -l
2188
[centos@instance-group-1-srwq ~]$
When vRouters are installed, some more nodes are rebooted, and2140 vRouters become available.
Every 10.0s: kubectl get pod --all-namespaces | grep contrail | grep Running | wc -l Sun Feb 1617:25:162020
2140
After start creating 2k containers, 15 minutes is needed before 2k containers are up.
Every 5.0s: kubectl get pod -n myns11 | grep Running | wc -l Sun Feb 1617:43:062020
1927
ping between containers works fine:
$ kubectl get pod -n myns11
(snip)
vn11-deployment-68565f967b-zxgl4 1/1 Running 015m 10.0.6.0 instance-group-3-bqv4 <none> <none>
vn11-deployment-68565f967b-zz2f8 1/1 Running 015m 10.0.6.16 instance-group-2-ffdq <none> <none>
vn11-deployment-68565f967b-zz8fk 1/1 Running 016m 10.0.1.61 instance-group-4-cpb8 <none> <none>
vn11-deployment-68565f967b-zzkdk 1/1 Running 016m 10.0.2.244 instance-group-3-pkrq <none> <none>
vn11-deployment-68565f967b-zzqb7 0/1 ContainerCreating 015m <none> instance-group-4-f5nw <none> <none>
vn11-deployment-68565f967b-zzt52 1/1 Running 015m 10.0.5.175 instance-group-3-slkw <none> <none>
vn11-deployment-68565f967b-zztd6 1/1 Running 015m 10.0.7.154 instance-group-4-skzk <none> <none>
[centos@instance-group-1-srwq ~]$ kubectl exec -it -n myns11 vn11-deployment-68565f967b-zzkdk sh
/ #
/ #
/ # ip -o a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
1: lo inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever
1: lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever
36: eth0@if37: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue link/ether 02:fd:53:2d:ea:50 brd ff:ff:ff:ff:ff:ff
36: eth0 inet 10.0.2.244/12 scope global eth0 valid_lft forever preferred_lft forever
36: eth0 inet6 fe80::e416:e7ff:fed3:9cc5/64 scope link valid_lft forever preferred_lft forever
/ # ping 10.0.1.61
PING 10.0.1.61 (10.0.1.61): 56 data bytes
64 bytes from10.0.1.61: seq=0 ttl=64 time=3.635 ms
64 bytes from10.0.1.61: seq=1 ttl=64 time=0.474 ms
^C
--- 10.0.1.61 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.474/2.054/3.635 ms
/ #
There are some XMPP flap .. it might be caused by CPU spike by config-api, or some effect of preemptive VM.
It needs to be investigated further with separating config and control.
(most of other 2k vRouter nodes won't experience XMPP flap though)
(venv) [centos@instance-group-1-h26k ~]$ ./contrail-introspect-cli/ist.py ctr nei -t XMPP -c flap_count | grep -v -w 0
+------------+
| flap_count |
+------------+
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
| 1 |
+------------+
(venv) [centos@instance-group-1-h26k ~]$
[BUM tree]
Send two multicast packets.
/ # ping 224.0.0.1
PING 224.0.0.1 (224.0.0.1): 56 data bytes
^C
--- 224.0.0.1 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss
/ #
/ # ip -o a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
1: lo inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever
1: lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever
36: eth0@if37: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue link/ether 02:fd:53:2d:ea:50 brd ff:ff:ff:ff:ff:ff
36: eth0 inet 10.0.2.244/12 scope global eth0 valid_lft forever preferred_lft forever
36: eth0 inet6 fe80::e416:e7ff:fed3:9cc5/64 scope link valid_lft forever preferred_lft forever
/ #
That container ison this node.
(venv) [centos@instance-group-1-h26k ~]$ ping instance-group-3-pkrq
PING instance-group-3-pkrq.asia-northeast1-b.c.stellar-perigee-161412.internal (10.0.3.211) 56(84) bytes of data.
64 bytes from instance-group-3-pkrq.asia-northeast1-b.c.stellar-perigee-161412.internal (10.0.3.211): icmp_seq=1 ttl=63 time=1.46 ms
It sends overlay packet to some other endpoints (not all 2k nodes),
[root@instance-group-3-pkrq ~]# tcpdump -nn -i eth0 udp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
17:48:51.501718 IP 10.0.3.211.57333 > 10.0.0.212.6635: UDP, length 142
17:48:52.501900 IP 10.0.3.211.57333 > 10.0.0.212.6635: UDP, length 142
and it eventually reach other containers, going through Edge Replicate tree.
[root@instance-group-4-cpb8 ~]# tcpdump -nn -i eth0 udp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
17:48:51.517306 IP 10.0.1.198.58095 > 10.0.5.244.6635: UDP, length 142
17:48:52.504484 IP 10.0.1.198.58095 > 10.0.5.244.6635: UDP, length 142
[resource usage]
controller:
CPU usage is moderate and bound by contrail-control process.
If more vRouter nodes need to be added, more controller nodes can be added.
- separating config and control also should help to reach further stability
top - 17:45:28 up 2:21, 2 users, load average: 7.35, 12.16, 16.33
Tasks: 577 total, 1 running, 576 sleeping, 0 stopped, 0 zombie
%Cpu(s): 14.9 us, 4.2 sy, 0.0 ni, 80.8 id, 0.0 wa, 0.0 hi, 0.1 si, 0.0 st
KiB Mem : 24745379+total, 22992752+free, 13091060 used, 4435200 buff/cache
KiB Swap: 0 total, 0 free, 0 used. 23311113+avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2393019992009871.3m 5.5g 14896 S 10132.31029:04 contrail-contro
239981999200577876831766012364 S 289.10.1320:18.42 contrail-dns
13434 polkitd 20033.6g 1632884968 S 3.30.132:04.85 beam.smp
2669619992008297681849406628 S 2.30.10:22.14 node
9838 polkitd 20025.4g 2.1g 15276 S 1.30.945:18.75 java
1012 root 200000 S 0.30.00:00.26 kworker/18:1
6293 root 20033888245057612600 S 0.30.00:34.39 docker-containe
9912 centos 20038.0g 41730412572 S 0.30.20:25.30 java
1662119992007353283772127252 S 0.30.223:27.40 contrail-api
22289 root 200000 S 0.30.00:00.04 kworker/16:2
24024 root 200259648419925064 S 0.30.00:28.81 contrail-nodemg
48459 centos 20016032827081536 R 0.30.00:00.33 top
61029 root 200000 S 0.30.00:00.09 kworker/4:2
1 root 20019368067804180 S 0.00.00:02.86 systemd
2 root 200000 S 0.00.00:00.03 kthreadd
[centos@instance-group-1-rc34 ~]$ free -h
total used free shared buff/cache available
Mem: 235G 12G 219G 9.8M 3.9G 222G
Swap: 0B 0B 0B
[centos@instance-group-1-rc34 ~]$
[centos@instance-group-1-rc34 ~]$ df -h .
/dev/sda1 10G 5.1G 5.0G 51% /
[centos@instance-group-1-rc34 ~]$
analytics:
CPU usage is moderate and bound by contrail-collector process.
If more vRouter nodes need to be added, more analytics nodes can be added.
top - 17:45:59 up 2:21, 1 user, load average: 0.84, 2.57, 4.24
Tasks: 515 total, 1 running, 514 sleeping, 0 stopped, 0 zombie
%Cpu(s): 3.3 us, 1.3 sy, 0.0 ni, 95.4 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 24745379+total, 24193969+free, 3741324 used, 1772760 buff/cache
KiB Swap: 0 total, 0 free, 0 used. 24246134+avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
63341999200760420095828810860 S 327.80.4493:31.11 contrail-collec
4904 polkitd 2002974242714441676 S 14.60.110:42.34 redis-server
4110 root 20034621209515634660 S 1.00.01:21.32 dockerd
9 root 200000 S 0.30.00:04.81 rcu_sched
29 root 200000 S 0.30.00:00.05 ksoftirqd/4
8553 centos 20016030826081536 R 0.30.00:00.07 top
1 root 20019356466564180 S 0.00.00:02.77 systemd
2 root 200000 S 0.00.00:00.03 kthreadd
4 root 0-20000 S 0.00.00:00.00 kworker/0:0H
5 root 200000 S 0.00.00:00.77 kworker/u128:0
6 root 200000 S 0.00.00:00.17 ksoftirqd/0
7 root rt 0000 S 0.00.00:00.38 migration/0
[centos@instance-group-1-n4c7 ~]$ free -h
total used free shared buff/cache available
Mem: 235G 3.6G 230G 8.9M 1.7G 231G
Swap: 0B 0B 0B
[centos@instance-group-1-n4c7 ~]$
[centos@instance-group-1-n4c7 ~]$ df -h .
/dev/sda1 10G 3.1G 6.9G 32% /
[centos@instance-group-1-n4c7 ~]$
kube-master:
CPU usage is small.
top - 17:46:18 up 2:22, 2 users, load average: 0.92, 1.32, 2.08
Tasks: 556 total, 1 running, 555 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1.2 us, 0.5 sy, 0.0 ni, 98.2 id, 0.1 wa, 0.0 hi, 0.1 si, 0.0 st
KiB Mem : 24745379+total, 23662128+free, 7557744 used, 3274752 buff/cache
KiB Swap: 0 total, 0 free, 0 used. 23852964+avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5177 root 20036058523.1g 41800 S 78.11.3198:42.92 kube-apiserver
5222 root 20010.3g 633316410812 S 55.00.3109:52.52 etcd
5198 root 20084694865166831284 S 8.30.3169:03.71 kube-controller
5549 root 20047536649652834260 S 5.00.04:45.54 kubelet
3493 root 20047595087186416040 S 0.70.01:52.67 dockerd-current
5197 root 20050080030705617724 S 0.70.16:43.91 kube-scheduler
19933 centos 20016034026481528 R 0.70.00:00.07 top
1083 root 0-20000 S 0.30.00:20.19 kworker/0:1H
35229 root 200000 S 0.30.00:15.08 kworker/0:2
1 root 20019380868844212 S 0.00.00:03.59 systemd
2 root 200000 S 0.00.00:00.03 kthreadd
4 root 0-20000 S 0.00.00:00.00 kworker/0:0H
5 root 200000 S 0.00.00:00.55 kworker/u128:0
6 root 200000 S 0.00.00:01.51 ksoftirqd/0
[centos@instance-group-1-srwq ~]$ free -h
total used free shared buff/cache available
Mem: 235G 15G 217G 121M 3.2G 219G
Swap: 0B 0B 0B
[centos@instance-group-1-srwq ~]$
[centos@instance-group-1-srwq ~]$ df -h /
/dev/sda1 10G 4.6G 5.5G 46% /
[centos@instance-group-1-srwq ~]$
[centos@instance-group-1-srwq ~]$ free -h
total used free shared buff/cache available
Mem: 235G 15G 217G 121M 3.2G 219G
Swap: 0B 0B 0B
[centos@instance-group-1-srwq ~]$
[centos@instance-group-1-srwq ~]$ df -h /
/dev/sda1 10G 4.6G 5.5G 46% /
[centos@instance-group-1-srwq ~]$
附：erm-vpn
启用erm-vpn后，vrouter会将多播流量发送到最多4个节点上，以避免入口（ingress）复制到所有节点。控制器以生成树的方式，将多播数据包发送到所有节点。
·https://tools.ietf.org/html/draft-marques-l3vpn-mcast-edge-00
·https://review.opencontrail.org/c/Juniper/contrail-controller/+/256
为了说明此功能，我创建了一个具有20个kubernete worker的集群，并部署了20个副本。
·没有使用default-k8s-pod-network，因为它是仅支持l3转发的模式。这里手动定义了vn1（10.0.1.0/24）
在此设置中，以下的命令将转储下一跳（下一跳将发送overlay BUM流量）。
·vrf 2在每个worker节点上都有vn1的路由
·all.txt上具有20个节点的IP
·当BUM数据包从“ Introspect Host”上的容器发送时，它们以单播overlay的方式发送到“dip”地址
[root@ip-172-31-12-135 ~]# for i in $(cat all.txt); do ./contrail-introspect-cli/ist.py --host $i vr route -v 2 --family layer2 ff:ff:ff:ff:ff:ff -r | grep -w -e dip -e Introspect | sort -r | uniq ; done
Introspect Host: 172.31.15.27
dip: 172.31.7.18
Introspect Host: 172.31.4.249
dip: 172.31.9.151
dip: 172.31.9.108
dip: 172.31.8.233
dip: 172.31.2.127
dip: 172.31.10.233
Introspect Host: 172.31.14.220
dip: 172.31.7.6
Introspect Host: 172.31.8.219
dip: 172.31.3.56
Introspect Host: 172.31.7.223
dip: 172.31.3.56
Introspect Host: 172.31.2.127
dip: 172.31.7.6
dip: 172.31.7.18
dip: 172.31.4.249
dip: 172.31.3.56
Introspect Host: 172.31.14.255
dip: 172.31.7.6
Introspect Host: 172.31.7.6
dip: 172.31.2.127
dip: 172.31.14.255
dip: 172.31.14.220
dip: 172.31.13.115
dip: 172.31.11.208
Introspect Host: 172.31.10.233
dip: 172.31.4.249
Introspect Host: 172.31.15.232
dip: 172.31.7.18
Introspect Host: 172.31.9.108
dip: 172.31.4.249
Introspect Host: 172.31.8.233
dip: 172.31.4.249
Introspect Host: 172.31.8.206
dip: 172.31.3.56
Introspect Host: 172.31.7.142
dip: 172.31.3.56
Introspect Host: 172.31.15.210
dip: 172.31.7.18
Introspect Host: 172.31.11.208
dip: 172.31.7.6
Introspect Host: 172.31.13.115
dip: 172.31.9.151
Introspect Host: 172.31.7.18
dip: 172.31.2.127
dip: 172.31.15.27
dip: 172.31.15.232
dip: 172.31.15.210
Introspect Host: 172.31.3.56
dip: 172.31.8.219
dip: 172.31.8.206
dip: 172.31.7.223
dip: 172.31.7.142
dip: 172.31.2.127
Introspect Host: 172.31.9.151
dip: 172.31.13.115
[root@ip-172-31-12-135 ~]# 举例来说，我尝试从worker 172.31.7.18上的一个容器向一个多播地址（$ ping 224.0.0.1）发送ping信息，它向dip列表中的计算节点发送了4个数据包。
[root@ip-172-31-7-18 ~]# tcpdump -nn -i eth0 -v udp port 6635
15:02:29.883608 IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto UDP (17), length 170)
172.31.7.18.63685 > 172.31.2.127.6635: UDP, length 142
15:02:29.883623 IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto UDP (17), length 170)
172.31.7.18.63685 > 172.31.15.27.6635: UDP, length 142
15:02:29.883626 IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto UDP (17), length 170)
172.31.7.18.63685 > 172.31.15.210.6635: UDP, length 142
15:02:29.883629 IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto UDP (17), length 170)
172.31.7.18.63685 > 172.31.15.232.6635: UDP, length 142未定义为直接下一跳的其它节点（172.31.7.223）也接收了多播数据包，尽管它的延迟有所增加。
·在这种情况下，需要额外增加2个跃点：172.31.7.18-> 172.31.2.127-> 172.31.3.56-> 172.31.7.223
[root@ip-172-31-7-223 ~]# tcpdump -nn -i eth0 -v udp port 6635
15:02:29.884070 IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto UDP (17), length 170)
172.31.3.56.56541 > 172.31.7.223.6635: UDP, length 142原文链接： https://github.com/tnaganawa/tungstenfabric-docs/blob/master/TungstenFabricKnowledgeBase.md
往期精选
Tungsten Fabric知识库丨vRouter内部运行探秘 Tungsten Fabric知识库丨更多组件内部探秘 Tungsten Fabric知识库丨 构建、安装与公有云部署
Tungsten Fabric入门宝典系列文章—— 1.首次启动和运行指南 2.TF组件的七种“武器” 3.编排器集成 4.关于安装的那些事（上） 5.关于安装的那些事（下） 6.主流监控系统工具的集成 7.开始第二天的工作 8.8个典型故障及排查Tips 9.关于集群更新的那些事 10.说说L3VPN及EVPN集成 11.关于服务链、BGPaaS及其它 12.关于多集群和多数据中心 13.多编排器用法及配置
- 报警系统QuickAlarm之报警规则解析
- 报警系统QuickAlarm之报警规则的设定与加载
- 报警系统QuickAlarm之报警执行器的设计与实现
- 如何在Kerberos与非Kerberos的CDH集群BDR不可用时复制数据
- 一个可扩展的报警系统Quick-Alarm
- 如何借助GitHub搭建属于自己的maven仓库
- Java可以如何实现文件变动的监听
- 如何在CDH中安装Kudu&Spark2&Kafka
- 秒懂 javascript 拖拽上传文件
- 一款轻量级树形控件EasyTreeview
- 大白话谈 Git
- 打造一个属于自己的 server
- 一款不可多得的火柴时钟
- 常见端口转发工具的使用方式（二）
- JavaScript 教程
- JavaScript 编辑工具
- JavaScript 与HTML
- JavaScript 与Java
- JavaScript 数据结构
- JavaScript 基本数据类型
- JavaScript 特殊数据类型
- JavaScript 运算符
- JavaScript typeof 运算符
- JavaScript 表达式
- JavaScript 类型转换
- JavaScript 基本语法
- JavaScript 注释
- Javascript 基本处理流程
- Javascript 选择结构
- Javascript if 语句
- Javascript if 语句的嵌套
- Javascript switch 语句
- Javascript 循环结构
- Javascript 循环结构实例
- Javascript 跳转语句
- Javascript 控制语句总结
- Javascript 函数介绍
- Javascript 函数的定义
- Javascript 函数调用
- Javascript 几种特殊的函数
- JavaScript 内置函数简介
- Javascript eval() 函数
- Javascript isFinite() 函数
- Javascript isNaN() 函数
- parseInt() 与 parseFloat()
- escape() 与 unescape()
- Javascript 字符串介绍
- Javascript length属性
- javascript 字符串函数
- Javascript 日期对象简介
- Javascript 日期对象用途
- Date 对象属性和方法
- Javascript 数组是什么
- Javascript 创建数组
- Javascript 数组赋值与取值
- Javascript 数组属性和方法