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在Ubuntu 12.04上，间歇性SIGSEV（segfault），SIGABORT和进程在单声道C＃代码中挂起(Intermittent SIGSEV (segfault), SIGABORT and process hangs in C# code using Mono)
在Ubuntu 12.04上，间歇性SIGSEV（segfault），SIGABORT和进程在单声道C＃代码中挂起(Intermittent SIGSEV (segfault), SIGABORT and process hangs in C# code using Mono)
我们在Ubuntu上运行的C＃mono项目中看到了间歇性的段错误和进程挂起。 我花了很多时间尝试调试问题，包括遵循这些说明： http ： //www.mono-project.com/docs/debug+profile/debug/
数据点：
发生这种情况的频率在不同环境中有很大差异。 在我们的UAT环境中，它很少发生。 在生产中，每隔几个小时，在我们的开发机器上，这个过程很幸运，运行20分钟而不会失败。
我们将单声道版本升级到4.03，没有任何改进。
症状：
进程挂起，不响应SIGQUIT或SIGTERM，或者SIGSEGV或SIGABRT失败
这是一个示例转储，虽然它们有所不同，但大多数情况下不包含以下断言失败。
* Assertion: should not be reached at sgen-scan-object.h:101 Native stacktrace: /usr/bin/mono() [0x4b23ac] /lib/x86_64-linux-gnu/libpthread.so.0(+0x10340) [0x7fbaa5e50340] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x39) [0x7fbaa5ab1cc9] /lib/x86_64-linux-gnu/libc.so.6(abort+0x148) [0x7fbaa5ab50d8] /usr/bin/mono() [0x629839] /usr/bin/mono() [0x629a47] /usr/bin/mono() [0x629b96] /usr/bin/mono() [0x5d85a8] /usr/bin/mono() [0x5cbd56] /usr/bin/mono() [0x5cd458] /usr/bin/mono() [0x5cdaab] /usr/bin/mono() [0x5d0d32] /usr/bin/mono(mono_gc_collect+0x28) [0x5d1458] /usr/bin/mono() [0x59c18a] /usr/bin/mono() [0x623a06] /lib/x86_64-linux-gnu/libpthread.so.0(+0x8182) [0x7fbaa5e48182] /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7fbaa5b7547d] Debug info from gdb: Could not attach to process. If your uid matches the uid of the target process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf ptrace: Operation not permitted. No threads. ================================================================= Got a SIGABRT while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. =================================================================我不是100％确定挂起，段错误和sigabrt都是由同一个问题引起的，但我怀疑它们是。 挂起感觉不像普通的死锁，因为该进程不响应SIGQUIT或SIGTERM。
我已按照http://www.mono-project.com/docs/debug+profile/debug/中的说明尝试附加gdb，但结果并不那么引人注目。
这是我的.gdbinit：
less ~/.gdbinit handle SIGXCPU SIG33 SIG35 SIGPWR nostop noprint define mono_stack set $mono_thread = mono_thread_current () if ($mono_thread == 0x00) printf "No mono thread associated with this thread\n" else set $ucp = malloc (sizeof (ucontext_t)) call (void) getcontext ($ucp) call (void) mono_print_thread_dump ($ucp) call (void) free ($ucp) end end这是我的一个gdb调试会话（挂起进程）的输出：
(gdb) where #0 0x00007f2bbba05062 in do_sigsuspend (set=0x945300) at ../sysdeps/unix/sysv/linux/sigsuspend.c:31 #1 __GI___sigsuspend (set=0x945300) at ../sysdeps/unix/sysv/linux/sigsuspend.c:45 #2 0x00000000005c8ccc in ?? () #3 <signal handler called> #4 pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 #5 0x00000000005fdda7 in ?? () #6 0x0000000000610aac in ?? () #7 0x0000000000585f6e in ?? () #8 0x0000000000586ee9 in ?? () #9 0x00000000403eb416 in ?? () #10 0x000000000290e8b0 in ?? () #11 0x00007fff29bfacb0 in ?? () #12 0x0000000000000000 in ?? () (gdb) p mono_pmip (0x00000000005fdda7) $1 = 0 (doesn’t seem to print anything either to gdb console or process stdout) (gdb) call mono_locks_dump (0) $2 = 0 Total locks (in 10 array(s)): 16368, used: 399, on freelist: 213, to recycle: 15752 (gdb) mono_stack() "<unnamed thread>" tid=0x0x7f2bbc8d47c0 this=0x0x7f2bbc858140 thread handle 0x403 state : waiting on 0x41a : Event owns () at <unknown> <0xffffffff> at (wrapper managed-to-native) System.Threading.WaitHandle.WaitOne_internal (System.Threading.WaitHandle,intptr,int,bool) <IL 0x0001c, 0xffffffff> at System.Threading.WaitHandle.WaitOne (System.TimeSpan,bool) <0x0009b> at System.Threading.WaitHandle.WaitOne (System.TimeSpan) <0x0001d> at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.RunUntilSignaled () [0x00073] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:184 at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.Run (string[]) [0x00019] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:35 at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.Main (string[]) [0x00000] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:24 at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object (object,intptr,intptr,intptr) <IL 0x0006c, 0xffffffff> "<unnamed thread>" tid=0x0x7f2bbc8d47c0 this=0x0x7f2bbc858140 thread handle 0x403 state : waiting on 0x41a : Event owns () at <unknown> <0xffffffff> at (wrapper managed-to-native) System.Threading.WaitHandle.WaitOne_internal (System.Threading.WaitHandle,intptr,int,bool) <IL 0x0001c, 0xffffffff> at System.Threading.WaitHandle.WaitOne (System.TimeSpan,bool) <0x0009b> at System.Threading.WaitHandle.WaitOne (System.TimeSpan) <0x0001d> at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.RunUntilSignaled () [0x00073] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:184 at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.Run (string[]) [0x00019] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:35 at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.Main (string[]) [0x00000] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:24 at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object (object,intptr,intptr,intptr) <IL 0x0006c, 0xffffffff> call mono_locks_dump (0) $1 = 51700864 (gdb) call mono_locks_dump (1) $2 = 56715296 Total locks (in 10 array(s)): 16368, used: 399, on freelist: 213, to recycle: 15752 Lock 0x29d68d0 in object 0x7f2ba8d13590 untaken Lock 0x29d68f8 in object 0x7f2b7482c2c0 untaken Lock 0x29d6920 in object 0x7f2b7482cd00 untaken Lock 0x29d6948 in object 0x7f2b7482cb70 untaken Lock 0x29d6970 in object 0x7f2b7482c760 untaken Lock 0x29d6998 in object 0x7f2b7482d380 untaken Lock 0x29d69c0 in object 0x7f2b7482c540 untaken Lock 0x29d69e8 in object 0x7f2b7482c240 untaken …... times lots (gdb) call mono_object_describe (0x41a) The following is printed to the gdb console. Program received signal SIGSEGV, Segmentation fault. 0x000000000052c1a2 in mono_object_describe () The program being debugged was signaled while in a function called from GDB. GDB remains in the frame where the signal was received. To change this behavior use "set unwindonsignal on". Evaluation of the expression containing the function (mono_object_describe) will be abandoned. When the function is done executing, GDB will silently stop. (gdb) quit A debugging session is active. Inferior 1 [process 7763] will be detached. Quit anyway? (y or n) y Detaching from program: /usr/bin/mono-sgen, process 7763 As soon as gdb finishes, the process writes remaining log messages to gdb console and then restarts (possibly by upstart) ubuntu@shim-megastore-prod:/var/log/upstart$ 2015-08-20 01:48:20,124 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: Service check complete. 2015-08-20 01:48:22,641 INFO ( 5) iri.PdSDaemon.Services.CloudWatchService :: 936 metrics averaged... 2015-08-20 01:48:22,716 INFO ( 5) iri.PdSDaemon.Services.CloudWatchService :: 4 metrics posted to CloudWatch. 2015-08-20 01:48:29,568 INFO (ker) piri.PdSDaemon.Services.PriceSyncService :: 98.8% synchronised (15.1/sec) 2015-08-20 01:48:39,820 DEBUG ( 4) ri.PdSDaemon.Services.ProductSyncService :: Zzzz Process restarts, or is restarted by Upstart 2015-08-20 06:51:20,163 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: Ponte dei Sospiri Daemon Version 1.0.5695.31695 2015-08-20 06:51:20,172 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: Process ID: 12625 2015-08-20 06:51:20,172 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: 2015-08-20 06:51:20,182 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: ProductSyncService is not running, firing it up... 2015-08-20 06:51:20,183 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: CloudWatchService is not running, firing it up... 2015-08-20 06:51:20,185 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: OrderProcessingService is not running, firing it up... The above is all written to the gdb console window. From then on, the output goes to the upstart console log.以下是项目依赖项的列表：
<package id="AWSSDK" version="2.3.20.0" targetFramework="net40" /> <package id="CsvHelper" version="2.10.0" targetFramework="net40" /> <package id="FluentMigrator" version="1.4.0.0" targetFramework="net40" /> <package id="Mono.Options" version="1.1" targetFramework="net40" /> <package id="Npgsql" version="2.2.5" targetFramework="net40" /> <package id="ServiceStack.Common" version="3.9.71" targetFramework="net40" /> <package id="ServiceStack.OrmLite.PostgreSQL" version="3.9.71" targetFramework="net40" /> <package id="ServiceStack.OrmLite.Sqlite.Mono" version="3.9.71" targetFramework="net40" /> <package id="ServiceStack.Text" version="3.9.71" targetFramework="net40" /> targetFramework="net40" /> <package id="log4net" version="2.0.3" targetFramework="net40" />关于如何获得有关导致这种情况发生的更具体信息的任何想法/建议？ 它似乎可能是单声道中的错误，也可能是其中一个本机库（因为我们没有不安全的代码），但我似乎无法解决问题的来源。
任何帮助非常感谢！
谢谢，
河
We have been seeing intermittent segfaults and process hangs in our C# mono project, running on Ubuntu. I’ve spent quite a bit of time trying to debug the issue, including following these instructions: http://www.mono-project.com/docs/debug+profile/debug/
Data points:
The frequency with which this happens varies significantly across different environments. In our UAT environment, it happens very rarely. In production, it's every few hours, and on our dev machine, the process is lucky to run for 20 minutes without failing.
We upgraded our mono version to 4.03, with no improvement.
Symptoms:
Either the process hangs, and does not respond to SIGQUIT or SIGTERM, or it fails with either SIGSEGV, or SIGABRT
Here's an example dump, although they vary a bit, and mostly don't contain the below assertion failure.
* Assertion: should not be reached at sgen-scan-object.h:101 Native stacktrace: /usr/bin/mono() [0x4b23ac] /lib/x86_64-linux-gnu/libpthread.so.0(+0x10340) [0x7fbaa5e50340] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x39) [0x7fbaa5ab1cc9] /lib/x86_64-linux-gnu/libc.so.6(abort+0x148) [0x7fbaa5ab50d8] /usr/bin/mono() [0x629839] /usr/bin/mono() [0x629a47] /usr/bin/mono() [0x629b96] /usr/bin/mono() [0x5d85a8] /usr/bin/mono() [0x5cbd56] /usr/bin/mono() [0x5cd458] /usr/bin/mono() [0x5cdaab] /usr/bin/mono() [0x5d0d32] /usr/bin/mono(mono_gc_collect+0x28) [0x5d1458] /usr/bin/mono() [0x59c18a] /usr/bin/mono() [0x623a06] /lib/x86_64-linux-gnu/libpthread.so.0(+0x8182) [0x7fbaa5e48182] /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7fbaa5b7547d] Debug info from gdb: Could not attach to process. If your uid matches the uid of the target process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf ptrace: Operation not permitted. No threads. ================================================================= Got a SIGABRT while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. =================================================================I'm not 100% sure that the hangs, segfaults, and sigabrt's are all caused by the same issue, but I suspect they are. The hangs don't feel like an ordinary deadlock, since the process doesn't respond to SIGQUIT or SIGTERM.
I've tried attaching gdb, following the instructions in http://www.mono-project.com/docs/debug+profile/debug/, but the results were less than spectacular.
Here's my .gdbinit:
less ~/.gdbinit handle SIGXCPU SIG33 SIG35 SIGPWR nostop noprint define mono_stack set $mono_thread = mono_thread_current () if ($mono_thread == 0x00) printf "No mono thread associated with this thread\n" else set $ucp = malloc (sizeof (ucontext_t)) call (void) getcontext ($ucp) call (void) mono_print_thread_dump ($ucp) call (void) free ($ucp) end endHere's the output from one of my gdb debugging sessions (of the hung process):
(gdb) where #0 0x00007f2bbba05062 in do_sigsuspend (set=0x945300) at ../sysdeps/unix/sysv/linux/sigsuspend.c:31 #1 __GI___sigsuspend (set=0x945300) at ../sysdeps/unix/sysv/linux/sigsuspend.c:45 #2 0x00000000005c8ccc in ?? () #3 <signal handler called> #4 pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 #5 0x00000000005fdda7 in ?? () #6 0x0000000000610aac in ?? () #7 0x0000000000585f6e in ?? () #8 0x0000000000586ee9 in ?? () #9 0x00000000403eb416 in ?? () #10 0x000000000290e8b0 in ?? () #11 0x00007fff29bfacb0 in ?? () #12 0x0000000000000000 in ?? () (gdb) p mono_pmip (0x00000000005fdda7) $1 = 0 (doesn’t seem to print anything either to gdb console or process stdout) (gdb) call mono_locks_dump (0) $2 = 0 Total locks (in 10 array(s)): 16368, used: 399, on freelist: 213, to recycle: 15752 (gdb) mono_stack() "<unnamed thread>" tid=0x0x7f2bbc8d47c0 this=0x0x7f2bbc858140 thread handle 0x403 state : waiting on 0x41a : Event owns () at <unknown> <0xffffffff> at (wrapper managed-to-native) System.Threading.WaitHandle.WaitOne_internal (System.Threading.WaitHandle,intptr,int,bool) <IL 0x0001c, 0xffffffff> at System.Threading.WaitHandle.WaitOne (System.TimeSpan,bool) <0x0009b> at System.Threading.WaitHandle.WaitOne (System.TimeSpan) <0x0001d> at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.RunUntilSignaled () [0x00073] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:184 at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.Run (string[]) [0x00019] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:35 at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.Main (string[]) [0x00000] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:24 at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object (object,intptr,intptr,intptr) <IL 0x0006c, 0xffffffff> "<unnamed thread>" tid=0x0x7f2bbc8d47c0 this=0x0x7f2bbc858140 thread handle 0x403 state : waiting on 0x41a : Event owns () at <unknown> <0xffffffff> at (wrapper managed-to-native) System.Threading.WaitHandle.WaitOne_internal (System.Threading.WaitHandle,intptr,int,bool) <IL 0x0001c, 0xffffffff> at System.Threading.WaitHandle.WaitOne (System.TimeSpan,bool) <0x0009b> at System.Threading.WaitHandle.WaitOne (System.TimeSpan) <0x0001d> at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.RunUntilSignaled () [0x00073] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:184 at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.Run (string[]) [0x00019] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:35 at COG.PonteDeiSospiri.PdSDaemon.CuratorDaemon.Main (string[]) [0x00000] in /home/ubuntu/jenkins/sharedspace/bridge-shared-workspace/app/PdS-Daemon/CuratorDaemon.cs:24 at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object (object,intptr,intptr,intptr) <IL 0x0006c, 0xffffffff> call mono_locks_dump (0) $1 = 51700864 (gdb) call mono_locks_dump (1) $2 = 56715296 Total locks (in 10 array(s)): 16368, used: 399, on freelist: 213, to recycle: 15752 Lock 0x29d68d0 in object 0x7f2ba8d13590 untaken Lock 0x29d68f8 in object 0x7f2b7482c2c0 untaken Lock 0x29d6920 in object 0x7f2b7482cd00 untaken Lock 0x29d6948 in object 0x7f2b7482cb70 untaken Lock 0x29d6970 in object 0x7f2b7482c760 untaken Lock 0x29d6998 in object 0x7f2b7482d380 untaken Lock 0x29d69c0 in object 0x7f2b7482c540 untaken Lock 0x29d69e8 in object 0x7f2b7482c240 untaken …... times lots (gdb) call mono_object_describe (0x41a) The following is printed to the gdb console. Program received signal SIGSEGV, Segmentation fault. 0x000000000052c1a2 in mono_object_describe () The program being debugged was signaled while in a function called from GDB. GDB remains in the frame where the signal was received. To change this behavior use "set unwindonsignal on". Evaluation of the expression containing the function (mono_object_describe) will be abandoned. When the function is done executing, GDB will silently stop. (gdb) quit A debugging session is active. Inferior 1 [process 7763] will be detached. Quit anyway? (y or n) y Detaching from program: /usr/bin/mono-sgen, process 7763 As soon as gdb finishes, the process writes remaining log messages to gdb console and then restarts (possibly by upstart) ubuntu@shim-megastore-prod:/var/log/upstart$ 2015-08-20 01:48:20,124 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: Service check complete. 2015-08-20 01:48:22,641 INFO ( 5) iri.PdSDaemon.Services.CloudWatchService :: 936 metrics averaged... 2015-08-20 01:48:22,716 INFO ( 5) iri.PdSDaemon.Services.CloudWatchService :: 4 metrics posted to CloudWatch. 2015-08-20 01:48:29,568 INFO (ker) piri.PdSDaemon.Services.PriceSyncService :: 98.8% synchronised (15.1/sec) 2015-08-20 01:48:39,820 DEBUG ( 4) ri.PdSDaemon.Services.ProductSyncService :: Zzzz Process restarts, or is restarted by Upstart 2015-08-20 06:51:20,163 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: Ponte dei Sospiri Daemon Version 1.0.5695.31695 2015-08-20 06:51:20,172 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: Process ID: 12625 2015-08-20 06:51:20,172 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: 2015-08-20 06:51:20,182 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: ProductSyncService is not running, firing it up... 2015-08-20 06:51:20,183 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: CloudWatchService is not running, firing it up... 2015-08-20 06:51:20,185 INFO ( 1) .PonteDeiSospiri.PdSDaemon.CuratorDaemon :: OrderProcessingService is not running, firing it up... The above is all written to the gdb console window. From then on, the output goes to the upstart console log.Here is a list of the dependencies of the project:
<package id="AWSSDK" version="2.3.20.0" targetFramework="net40" /> <package id="CsvHelper" version="2.10.0" targetFramework="net40" /> <package id="FluentMigrator" version="1.4.0.0" targetFramework="net40" /> <package id="Mono.Options" version="1.1" targetFramework="net40" /> <package id="Npgsql" version="2.2.5" targetFramework="net40" /> <package id="ServiceStack.Common" version="3.9.71" targetFramework="net40" /> <package id="ServiceStack.OrmLite.PostgreSQL" version="3.9.71" targetFramework="net40" /> <package id="ServiceStack.OrmLite.Sqlite.Mono" version="3.9.71" targetFramework="net40" /> <package id="ServiceStack.Text" version="3.9.71" targetFramework="net40" /> targetFramework="net40" /> <package id="log4net" version="2.0.3" targetFramework="net40" />Any ideas / suggestions on how I can get more specific information on what is causing this to happen? It seems likely that it's either a bug in mono, or in one of the native libraries (since we have no unsafe code), but I can't seem to work out where the issue is coming from.
Any assistance greatly appreciated!
原文：https://stackoverflow.com/questions/32281658
更新时间：2022-01-14 13:01
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例如，如果要仅在页面产品和类别中添加js文件，则可以执行以下操作： public function hookDisplayHeader($params) { $allowed_controllers = array('product', 'category'); $_controller = $this->context->controller; if (isset($_controller->php_self) && in_array($_controller->php_self, ...由于CSS无法选择滚动顶部，因此无法单独使用CSS。 不过，通过javascript很容易做到。 $(window).on("scroll", function () { if ($(this).scrollTop() > 100) { $("#header").addClass("not-transparent"); } else { $("#header").removeClass("not-transparent"); } }); It ...需要css来实现js(need css to js implementation)[2023-09-14]
要将此css转换为js click事件代码，请按照以下步骤操作： 1只需从scss文件中删除或注释：target css即可。 // &:target { // // Active animate in modal // &:before { // display: block; // } // .modal-dialog { // .translate(0, 0); // top: 20%; // } // } 写下Js ...考虑将资源与单一资源相结合。 这将最小化HTTP请求，这是一种很好的做法 。 Consider combining resources to single ones. This will minimize HTTP requests which is a good practice.图像标题CSS(Image header CSS)[2021-03-31]
如果您正确引用header ，它的工作完全正常 .header { /* MODIFICATION */ width: 100%; background-image: url("http://www.freewebheaders.com/wordpress/wp-content/gallery/global/global-franchise-blue-header.jpg"); text-align: center; padding: 5px; } body { margin: 0; ...相关文章
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