原因１
．从Log分析来看，这个是由于Dhcp request fail 导致最终disconnect .

Log 分析如下： 
16:53:31.659 958 6525 D NetUtils: dhcp_do_request failed : wlan0 (renew)
08-26 16:53:31.659 958 6525 E DhcpStateMachine: DHCPV4 failed on wlan0: Timed out waiting for DHCP Renew to finish
16:53:41.568 4013 4013 D wpa_supplicant: wlan0: Deauthentication notification
16:53:41.568 4013 4013 D wpa_supplicant: Deauthentication frame IE(s) - hexdump(len=0): [NULL]
16:53:41.569 4013 4013 D wpa_supplicant: wlan0: State: COMPLETED -> DISCONNECTED
需厂商更新一个firmware ，用Attach中的firmware 重新测试。

原因2.
看到fail的地方都是在四次握手的时候发生的失败 
03-06 18:23:06.585650 1024 1024 D wpa_supplicant: wlan0: State: 4WAY_HANDSHAKE -> DISCONNECTED
03-06 18:23:06.586188 749 1247 D WifiHW : [1] get event: IFNAME=wlan0 <3>WPA: 4-Way Handshake failed - pre-shared key may be incorrect
03-06 18:23:06.586198 749 1247 D WifiHW : [2] get event: IFNAME=wlan0 WPA: 4-Way Handshake failed - pre-shared key may be incorrect
失败应该是客户密码输入错误。如果手机还是一直连上不，可以把手机里的wpa_supplicant.conf文件拉出来，看下servicecenter这个AP的密码是否和预期的一样

原因３
经常reconnect是因为连接的AP信号太弱这时又没有发现有信号更好的AP，导致断线，当此AP信号稍好时又一次scan到此AP，这样才叫reconnect；而roaming是指连接的AP信号太弱这时发现有信号更好的AP，连接到信号更好的AP，这样叫roaming。从log_18_new这份log看到不间断的出现：
请注意： 
像12-09 22:43:18.203 922 922 D wpa_supplicant: wlan0: State: ASSOCIATED -> COMPLETED
12-09 23:13:28.204 922 922 D wpa_supplicant: wlan0: State: COMPLETED -> DISCONNECTED
12-09 23:13:28.305 922 922 D wpa_supplicant: wlan0: State: DISCONNECTED -> SCANNING
12-09 23:13:31.015 922 922 D wpa_supplicant: wlan0: State: SCANNING -> ASSOCIATING
12-09 23:13:31.092 922 922 D wpa_supplicant: wlan0: State: ASSOCIATING -> ASSOCIATED
12-09 23:13:31.093 922 922 D wpa_supplicant: wlan0: State: ASSOCIATED -> COMPLETED
这种就是发生了disconnect，然后reconnect成功，而我们在disconnect时间点没有看到其他引起断线的trace，那就说明是firmware上报的断线请求，可以看到：
12-09 20:38:49.199 922 922 D wpa_supplicant: wlan0: Event INTERFACE_STATUS (5) received
12-09 20:38:49.199 922 922 D wpa_supplicant: nl80211: Event message available
12-09 20:38:49.199 922 922 D wpa_supplicant: wlan0: Event DISASSOC (1) received
12-09 20:38:49.199 922 922 D wpa_supplicant: wlan0: Disassociation notification
而firmware上报断线的原因只有一种，就是它认为RSSI太弱了 
像12-10 04:37:40.633 922 922 D wpa_supplicant: wlan0: State: ASSOCIATED -> COMPLETED
12-10 05:09:43.609 922 922 D wpa_supplicant: wlan0: State: COMPLETED -> ASSOCIATED
12-10 05:09:43.609 922 922 D wpa_supplicant: wlan0: State: ASSOCIATED -> COMPLETED

这种就是发生了roaming，发生roaming的前提就是发现当前AP信号较弱，同时scan到了信号更好的AP．

原因４：
从log来看是AP要求设备断线的： 
09-06 10:48:56.919 <3>[ 1555.321037] (1)[3319:tx_thread][wlan] Rx Deauth frame from BSSID=[aa:63:df:5c:db:c5].
09-06 10:48:56.919 <3>[ 1555.321093] (1)[3319:tx_thread][wlan] Reason code = 7

原因５：
log中看到断线原因如下，是AP更改了security，导致断线 
04-20 11:32:37.439 <4>[ 3273.328514]<2> (1)[4122:tx_thread][wlan] rsnCheckSecurityModeChanged: (RSN INFO) security change, WPA2->WEP
04-20 11:32:37.439 <4>[ 3273.328530]<2> (1)[4122:tx_thread][wlan] scanProcessBeaconAndProbeResp: (SCN INFO) Beacon security mode change detected
04-20 11:32:37.439 <4>[ 3273.328544]<2> (1)[4122:tx_thread][wlan] aisFsmStateAbort_NORMAL_TR: (INIT INFO) aisFsmStateAbort_NORMAL_TR
04-20 11:32:37.439 <4>[ 3273.328559]<2> (1)[4122:tx_thread][wlan] aisFsmDisconnect: (INIT INFO) aisFsmDisconnect

有两次断开连接的情况，具体如下 
28191 04-09 18:39:16.715 3889 3889 D wpa_supplicant: nl80211: Associated on 2422 MHz
28192 04-09 18:39:16.715 3889 3889 D wpa_supplicant: nl80211: Associated with 10:0e:0e:20:61:15
发送roaming，断开与10:0e:0e:20:61:15的连接，重新连接另一个AP:10:0e:0e:20:5e:7d
33517 04-09 18:39:43.054 3889 3889 D wpa_supplicant: nl80211: Drv Event 47 (NL80211_CMD_ROAM) received for wlan0
33518 04-09 18:39:43.054 3889 3889 D wpa_supplicant: nl80211: Roam event
33519 04-09 18:39:43.054 3889 3889 D wpa_supplicant: nl80211: Associated on 2472 MHz
33520 04-09 18:39:43.054 3889 3889 D wpa_supplicant: nl80211: Associated with 10:0e:0e:20:5e:7d
33521 04-09 18:39:43.054 3889 3889 D wpa_supplicant: nl80211: Operating frequency for the associated BSS from scan results: 2472 MHz
33543 04-09 18:39:43.055 3889 3889 D wpa_supplicant: Operating frequency changed from 2422 to 2472 MHz
33544 04-09 18:39:43.055 3889 3889 D wpa_supplicant: nl80211: Associated on 2472 MHz
33545 04-09 18:39:43.055 3889 3889 D wpa_supplicant: nl80211: Associated with 10:0e:0e:20:5e:7d
33546 04-09 18:39:43.055 3889 3889 D wpa_supplicant: nl80211: Received scan results (1 BSSes)
33549 04-09 18:39:43.055 3889 3889 D wpa_supplicant: wlan0: State: COMPLETED -> ASSOCIATED
上层send disable network command,10:0e:0e:20:5e:7d断开连接
39804 04-09 18:40:07.283 3889 3889 D wpa_supplicant: wlan0: Control interface command 'DISABLE_NETWORK 1'
39805 04-09 18:40:07.283 3889 3889 D wpa_supplicant: CTRL_IFACE: DISABLE_NETWORK id=1
39806 04-09 18:40:07.283 3889 3889 D wpa_supplicant: wlan0: Request to deauthenticate - bssid=10:0e:0e:20:5e:7d pending_bssid=00:00:00:00:00:00 reason=3 state=COMPLETED
39808 04-09 18:40:07.283 3889 3889 D wpa_supplicant: wpa_driver_nl80211_disconnect(reason_code=3)
39817 04-09 18:40:07.298 3889 3889 D wpa_supplicant: wlan0: Event DEAUTH (12) received
39832 04-09 18:40:07.299 3889 3889 D wpa_supplicant: addr=10:0e:0e:20:5e:7d

39833 04-09 18:40:07.299 3889 3889 D wpa_supplicant: wlan0: State: COMPLETED -> DISCONNECTED

log2:

此问题从目前的Log分析来看，是由于这个Ap发了一个Deatuh的 Frame ，导致disconnect ，因此是Ap的行为。重新换Ap测试下。
Log分析如下： 
mainlog : 
08-24 11:24:15.410 1097 1097 D wpa_supplicant: nl80211: Drv Event 48 (NL80211_CMD_DISCONNECT) received for wlan0
08-24 11:24:15.410 1097 1097 D wpa_supplicant: nl80211: Disconnect event
08-24 11:24:15.410 1097 1097 D wpa_supplicant: wlan0: Event DEAUTH (12) received
08-24 11:24:15.410 1097 1097 D wpa_supplicant: wlan0: Deauthentication notification
08-24 11:24:15.410 1097 1097 D wpa_supplicant: wlan0: * reason 101
08-24 11:24:15.410 1097 1097 D wpa_supplicant: Deauthentication frame IE(s) - hexdump(len=0): [NULL]
08-24 11:24:15.410 1097 1097 I wpa_supplicant: wlan0: CTRL-EVENT-DISCONNECTED bssid=42:0e:0e:20:6a:d2 reason=101
08-24 11:24:15.410 1097 1097 D wpa_supplicant: wlan0: Disconnect event - remove keys
08-24 11:24:15.411 715 1217 D WifiMonitor: Event [IFNAME=wlan0 CTRL-EVENT-DISCONNECTED bssid=42:0e:0e:20:6a:d2 reason=101]
08-24 11:24:15.412 715 1217 E WifiMonitor: WifiMonitor notify network disconnect: null reason=0
08-24 11:24:15.420 1097 1097 D wpa_supplicant: wlan0: State: COMPLETED -> DISCONNECTED
从上面可以看出是由于收到了；discon所以导致断线！ 
而从kernellog 对应来分析： 
08-24 11:24:15.380 <4>[ 8153.620603]<0>-(0)[936:tx_thread][wlan] nicTxReleaseResource: (TX STATE) Release: TC4 count 1, Free=4; TC5 count 0, Free=2
08-24 11:24:15.395 <4>[ 8153.635513]<0> (0)[936:tx_thread][wlan] saaFsmRunEventRxDeauth: (SAA INFO) Rx Deauth frame from BSSID=[42:0e:0e:20:6a:d2].
08-24 11:24:15.395 <4>[ 8153.635553]<0> (0)[936:tx_thread][wlan] saaFsmRunEventRxDeauth: (SAA INFO) Deauth reason = 101
08-24 11:24:15.395 <4>[ 8153.635912]<0> (0)[936:tx_thread][wlan] nicMediaStateChange: (INIT TRACE) DisByMC
08-24 11:24:15.395 <4>[ 8153.635970]<0> (0)[936:tx_thread][wlan] kalIndicateStatusAndComplete: (INIT INFO) [wifi] wlan0 netif_carrier_off 2
08-24 11:24:15.399 <4>[ 8153.639801]<0> (0)[936:tx_thread][wlan] kalIndicateStatusAndComplete: (INIT INFO) [wifi] wlan0 cfg80211_disconnected
08-24 11:24:15.399 <6>[ 8153.639876]<0> (0)[12175:kworker/0:1][mtk_net][sched]dev_deactivate dev = wlan0
08-24 11:24:15.399 <4>[ 8153.640014]<0> (0)[936:tx_thread][wlan] aisFsmSteps: (AIS STATE) [13] TRANSITION: [10] -> [0]
从上面可以看出是：手机收到了Rx Deauth frame from BSSID=[42:0e:0e:20:6a:d2]. 从而导致断线。
因此此问题从上面Log具体来分析是Ap的行为。

 

原因６：
从kernel log可以看到，wlan driver在数据传输测试中，因为系统memory太低，alloc skb buffer一直失败，482~517一直印出下面的backtrace：
<4>[ 482.458525] (2)[5:kworker/u:0]CPU 1: hi: dump_backtrace+0x0/0 77
<4>[ 482.458539] (3)[2576:tx_thread][<c00122a8>] (dump_backtrace+0x0/0x10c) from [<c06e004c>] (dump_stack+0x18/0x1c)
<4>[ 482.458550] (3)[2576:tx_thread] r6:ddf5c000 r5:00000000 r4:00000020CP3:c0996244 r3:c0996244
<4>[ 482.458577] (2)[5:kworker/u:0]CPU 3: hi: 186, btch: 31 usd: 59
<4>[ 482.458590] (3)[2576:tx_thread][<c06e0034>] (dump_stack+0x0/0x1c) from [<c00d24e0>] (warn_alloc_failed+0xd0/0x114)
<4>[ 482.458611] (3)[2576:tx_thread][<c00d2410>] (warn_alloc_failed+0x0/0x114) from [<c00d4390>] (__alloc_pages_nodemask+0x3c4/0x828)
<4>[ 482.458627] (2)[5:kworker/u:0]active_anon:22059 inactive_anon:22130 isolated_anon:0
<4>[ 482.458634] (2)[5:kworker/u:0] active_file:11548 inactive_file:31936 isolated_file:0
<4>[ 482.458640] (2)[5:kworker/u:0] unevictable:1190 dirty:14552 writeback:2556 unstable:0
<4>[ 482.458646] (2)[5:kworker/u:0] free:255 slab_reclaimable:4501 slab_unreclaimable:6252
<4>[ 482.458653] (2)[5:kworker/u:0] mapped:5965 shmem:127 pagetables:2348 bounce:0
<4>[ 482.458671] (3)[2576:tx_thread] r3:00000000Normal free:1020kB min:2804kB low:8304kB high:9004kB active_anon:88236kB inactive_anon:88520kB active_file:46192kB inactive_file:127744kB unevictable:4760kB isolated(anon):0kB isolated(file):0kB present:492140kB mlocked:3004kB dirty:58208kB writeback:10224kB mapped:23860kB shmem:508kB slab_reclaimable:18004kB slab_unreclaimable:25008kB kernel_stack:6384kB pagetables:9392kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:61 all_unreclaimable? no 
<4>[ 482.458708] (2)[5:kworker/u:0]lowmem_reserve[]: 0 0 0
<4>[ 482.458721] (2)[5:kworker/u:0]Normal: 252:00000000 r2:00000000
<4>[ 482.458735] (3)[2576:tx_thread] r7:c09ad010 r6:00000000 r5:000000300*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1020kB
<4>[ 482.458774] (2)[5:kworker/u:0]44377 total pagecache pages
<4>[ 482.458782] (2)[5:kworker/u:0]249 pages in swap cache
<4>[ 482.458792] (2)[5:kworker/u:0]Swa:00000000 r4:00000000
<4>[ 482.458804] (2)[5:kworker/u:0]Free swap = 375288kB
<4>[ 482.458816] (3)[2576:tx_thread][<c00d3fcc>] (__alloc_pages_nodemask+0x0/0x828) from [<c00feb88>] (new_slab+0x1f0/0x21c)
<4>[ 482.458830] (2)[5:kworker/u:0]Total swap = 393212kB
<4>[ 482.458844] (3)[2576:tx_thread][<c00fe998>] (new_slab+0x0/0x21c) from [<c06e2ac8>] (__slab_alloc.isra.51.constprop.55+0x514/0x534)
<4>[ 482.458861] (2)[5:kworker/u:0]SLUB: Unable to allocate memory on node -1 (gfp=0x20)
<4>[ 482.458875] (3)[2576:tx_thread][<c06e25b4>] (__slab_alloc.isra.51.constprop.55+0x0/0x534) from [<c010005c>] (__kmalloc_track_caller+0x10c/0x160)
<4>[ 482.458899] (3)[2576:tx_thread][<c00fff50>] (__kmalloc_track_caller+0x0/0x160) from [<c059fa30>] (__alloc_skb+0x58/0xf4)
<4>[ 482.458910] (2)[5:kworker/u:0] cache: kmalloc-2048, object size: 2048, buffer size: 2048, default order: 0, min order: 0
<4>[ 482.458922] (2)[5:kworker/u:0] node 0: slabs: 0, objs: 0, free: 0
<4>[ 482.458946] (3)[2576:tx_thread][<c059f9d8>] (__alloc_skb+0x0/0xf4) from [<c059faec>] (dev_alloc_skb+0x20/0x44)
<4>[ 482.458973] (3)[2576:tx_thread][<c059facc>] (dev_alloc_skb+0x0/0x44) from [<c042b4a8>] (kalPacketAlloc+0x18/0x28)
<4>[ 482.459005] (3)[2576:tx_thread]kworker/u:0: page allocation failure: order:0, mode:0x20
<4>[ 482.459014] (2)[5:kworker/u:0]kworker/u:0: page allocation failure: order:0, mode:0x20
<4>[ 482.459023] (2)[5:kworker/u:0]Backtrace:
<4>[ 482.459034] (3)[2576:tx_thread] r4:e226a4c0[<c00122a8>] (dump_backtrace+0x0/0x10c) from [<c06e004c>] (dump_stack+0x18/0x1c)
<4>[ 482.459054] (2)[5:kworker/u:0] r6:ddc32000 r3:000042f0
<4>[ 482.459067] (2)[5:kworker/u:0] r5:00000000[<c041a470>] (nicRxSetupRFB+0x0/0xf4) from [<c03f93b0>] (wlanReturnPacket+0xc4/0x26c)
<4>[ 482.459087] (3)[2576:tx_thread] r5:000042f0 r4:e226a4c0
<4>[ 482.459101] (2)[5:kworker/u:0] r4:00000020[<c03f92ec>] (wlanReturnPacket+0x0/0x26c) from [<c042b650>] (kalRxIndicatePkts+0x168/0x298)
<4>[ 482.459120] (3)[2576:tx_thread] r7:d72b0000 r6:e2212b7c r5:dd3602e0 r3:00000000 r4:ce9d9e40
<4>[ 482.459143] (3)[2576:tx_thread] 
<4>[ 482.459154] (2)[5:kworker/u:0][<c06e0034>] (dump_stack+0x0/0x1c) from [<c00d24e0>] (warn_alloc_failed+0xd0/0x114)
<4>[ 482.459175] (2)[5:kworker/u:0][<c00d2410>] (warn_alloc_failed+0x0/0x114) from [<c00d4390>] (__alloc_pages_nodemask+0x3c4/0x828)
<4>[ 482.459191] (3)[2576:tx_thread][<c042b4e8>] (kalRxIndicatePkts+0x0/0x298) from [<c041c2e8>] (nicRxProcessRFBs+0x1e8/0x294)
<4>[ 482.459206] (2)[5:kworker/u:0] r3:00000000[<c041c100>] (nicRxProcessRFBs+0x0/0x294) from [<c041c79c>] (nicProcessRxInterrupt+0x24/0x5c)
<4>[ 482.459229] (2)[5:kworker/u:0] r2:00000000[<c041c778>] (nicProcessRxInterrupt+0x0/0x5c) from [<c0411d5c>] (nicProcessIST_impl+0x64/0x1b4)
最后FreeSwRfb在518时耗尽，这个时间点正好是tcpdump显示PC端没有回应的开始： 
<4>[ 518.094029] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094055] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094281] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094329] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094379] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094395] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094442] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094601] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094648] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094697] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094714] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb
<4>[ 518.094762] (1)[2576:tx_thread][wlan] qmHandleRxPackets: (QM TRACE) Mark NULL the Packet for less Free Sw Rfb

原文链接： https://blog.csdn.net/chi_wy/article/details/50963279
 

【转】Android WiFi 经常掉线出现的几个原因分析！的更多相关文章

  1. Android ListView异步载入图片乱序问题，原因分析及解决方式

    转载请注明出处:http://blog.csdn.net/guolin_blog/article/details/45586553 在Android全部系统自带的控件其中,ListView这个控件算是 ...

  2. Android升级ADT22后会报ClassNotFoundException的原因分析

    http://blog.csdn.net/huzgd/article/details/8962702 1.ADT16下,只要add to path就是add to path并export:2.ADT2 ...

  3. Android setVisibility(View.GONE)无效的问题及原因分析

    解决方案:可以在setVisibility()之前调用clearAnimation()方法清除掉动画,或setFillAfter(false)(时间上该函数内部也调用了clearAnimation() ...

  4. Android WIFI 分析(一)

    本文基于<深入理解Android WiFi NFC和GPS 卷>和 Android N 代码结合分析   WifiService 是 Frameworks中负责wifi功能的核心服务,它主 ...

  5. android wifi P2P CONNECT, INVITE和JOIN流程选择

    android wifi P2P CONNECT, INVITE和JOIN流程选择

  6. android wifi ANR问题分析总结

    android wifi ANR问题分析总结 1 看看main进程阻塞在那里? 2 调用关系的函数阻塞在那里? 3 最终阻塞函数的阻塞前的log以及状态

  7. android wifi驱动移植详细过程

    转自:http://bbs.imp3.net/thread-10558924-1-1.html 对于刚入手android没多久的人来说,android wifi 驱动的移植确实还是有难度的,不过参考了 ...

  8. Android WIFI 启动流程(TIP^^)

    前几天因为解决一堆Bug,没时间写.我不会每天都写,就是为了存档一些资料. 内容来源:工作中接触到的+高手博客+文档(Books)=自己理解 仅限参考^^ 此博客是上一个<<Android ...

  9. Android Wi-Fi基本操作

    从用户角度看,Android Wi-Fi模块自下向上可以看为5层:硬件驱动程序,wpa_suppplicant,JNI,WiFi API,WifiSettings应用程序. 1.wpa_supplic ...

随机推荐

  1. 7月17日刷题记录 分治Getting!循环比赛日程表

    通过数:1 ┭┮﹏┭┮ qdoj.xyz 1053 分治-循环比赛日程表 其实今天晚上留给编程的时间并不多,做出一道... 不过收获还是非常大的 毕竟本人从来没有学习过分治算法,今天竟然攻克了我人生中 ...

  2. Java 方法重写方法重载

    1,方法的重载和方法的重写 方法名相同形参列表不通 方法名字的重新定义2,面向过程是分步骤解决问题 用方法组织代码 面向对象是以分类的方式解决问题 用类住址代码3 类是对对象的抽象 对象万事万物都是对 ...

  3. Pycharm 中的翻译工具

    对于开发来说,大多数哥们英文欠缺,比如在下,我们大多数使用的开发工具是IDEA,IDEA 很强大,开发起来顺手. 废话不多说,让我们看一下如何使用翻译器. 打开Pycharm 的setting 设置, ...

  4. 20191014Java课堂记录

    1. Java字段初始化的规律 首先执行类成员定义时指定的默认值或类的初始化块,到底执行哪一个要看哪一个“排在前面”. 其次执行类的构造函数. 类的初始化块不接收任何的参数,而且只要一创建类的对象,它 ...

  5. limit_choices_to

    # 多对多 老师 teachers = models.ManyToManyField(verbose_name='任课老师', to='UserInfo', related_name="ab ...

  6. ORM Q查询

    表达式: Book.objects.filter(Q(pk=1)|(Q(user_id=1)& Q(room_id=1))) 方法: q=Q() q.connector="OR&qu ...

  7. python面向对象（一切皆对象）

    使用面向对象的思想设计一个乌龟的角色: 表面特征:绿色.有4条腿.重10kg.有外壳等等 行为特征:爬.吃.睡觉.将头和四肢缩到壳里等等 class tortoise: bodycolor = &qu ...

  8. 使用telnet连接redis

    平时连接redis用的是官方客户端redis-cli, 使用redis-cli最常用的几个参数如下: -h <hostname> Server hostname (default: 127 ...

  9. python类型-序列-元组

    元组是一种不可变类型,元组可用作一个字典的key. 1.创建一个元组并进行赋值 atuple = (123, 'abc', ('inner', 'tuple'), 7-9j) 2.访问元组中的值 元组 ...

  10. Excel.Application class

    https://docs.microsoft.com/en-us/javascript/api/excel/excel.application?view=office-js Represents th ...