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e.preventDefault()是什么

e.preventDefault()是一个JavaScript函数，它可以阻止浏览器的默认行为。例如，当你点击一个超链接时，浏览器会自动跳转到超链接指向的页面，这就是浏览器的默认行为。如果你希望在点击超链接时不跳转，可以在超链接的事件处理函数中使用e.preventDefault()来阻止浏览器的默认行为。 ...

开发笔记 ·2024-12-12

linux编译报错：/usr/include/c++/7/cstdlib:41:10: fatal error: bits/c++config.h: No such file or directory

今天在Linux中编译C/C++的程序遇到如下错误：make[3]:Leavingdirectory'/home/v2ray/lede/feeds/luci/applications/luci-app-upnp'time:package/feeds/luci/luci-app-upnp/compile#...

开发笔记 ·2024-08-29

std::qsort

定义于头文件<cstdlib>voidqsort(void*ptr,std::size_tcount,std::size_tsize,/*compare-pred*/*comp);voidqsort(void*ptr,std::size_tcount,std::size_tsize,/*c-compare-...

开发笔记 ·2024-08-26

thinkphp使用setInc和setDec进行字段加1减1

//score字段加1db('article')->where('id',1)->setInc('score');//score字段加5db('article')->where('id',1)->setInc('score',5);//score字段减1db('article')->whe...

开发笔记 ·2024-06-15

CountDownLatch是什么？

CountDownLatch是Java中一个同步工具类，用于控制多个线程的执行顺序。它可以让某个线程一直等待，直到其他线程完成各自的操作后再继续执行。CountDownLatch通过一个计数器来实现，计数器的初始值为线程数量，每当一个线程完成任务后，计数器的值就会减1，当计数器的值变为0时，等待的线程就会被唤醒继续执行...

开发笔记 ·2024-03-19

ORA-39502: failed to notify CRS of a Startup/Shutdown event [string] (ignored)

文档解释ORA-39502:failedtonotifyCRSofaStartup/Shutdownevent[string](ignored)Cause:Theinstancewasunabletocreateanenvironmentcontext.Action:NoneRequired.Theerrorisign...

IT技术学习 ·2023-07-28

ORA-39500: failed to notify CRS of a Startup/Shutdown event for database “string”, instance “string” (ignored)

文档解释ORA-39500:failedtonotifyCRSofaStartup/Shutdowneventfordatabase“string”,instance“string”(ignored)Cause:Theinstancewasunabletoobtainth...

IT技术学习 ·2023-07-28

ORA-53051: no editDataModel session found

文档解释ORA-53051:noeditDataModelsessionfoundCause:TheoperationfailedbecausetherewasnoeditDataModelsession.Action:CalltheeditDataModelprocedurefirstandtrytheoperati...

IT技术学习 ·2023-07-28

ORA-22601: pickler TDS context [string] is not initialized

文档解释ORA-22601:picklerTDScontext[string]isnotinitializedCause:AttempttousethepicklerTDScontextwithoutinitializingit.Action:UseOCIPicklerTdsCtxInittoinitializethe...

IT技术学习 ·2023-07-28

ORA-16732: error executing DBMS_LOGSTDBY.SKIP procedure

文档解释ORA-16732:errorexecutingDBMS_LOGSTDBY.SKIPprocedureCause:Logicalstandbydatabasepackagemaynotbeinstalled.Action:Installlogicalstandbydatabasepackagesandreiss...

IT技术学习 ·2023-07-28

ORA-18175: FTDY0016 weights invalid

文档解释ORA-18175:FTDY0016weightsinvalidCause:Itisadynamicerrorifanimplementationthatdoesnotsupportnegativeweightsencountersaweightexpressionthatdoesnotmeettherestr...

IT技术学习 ·2023-07-27

ORA-06034: NETDNT: connect failed, partner exited unexpectedly

文档解释ORA-06034:NETDNT:connectfailed,partnerexitedunexpectedlyCause:ConnectionwithhostnodewasmadebutpartnerabortedAction:Makesureobject(see06031,above)isworking(f...

IT技术学习 ·2023-07-26

ORA-06033: NETDNT: connect failed, partner rejected connection

文档解释ORA-06033:NETDNT:connectfailed,partnerrejectedconnectionCause:Connectionwithpartnerwasmadebutwasrejected.Action:Contactyournetworkadministrator.ORA-06033网络T...

IT技术学习 ·2023-07-26

ORA-30454: summary contains STDDEV without corresponding SUM & COUNT

文档解释ORA-30454:summarycontainsSTDDEVwithoutcorrespondingSUM&COUNTCause:IncrementalrefreshofsummarieswithSTDDEV(X)requiresCOUNT(X)andSUM(X)columnstobeincluded...

IT技术学习 ·2023-07-26

ORA-07713: sksamtd: could not mount archival device (SYS$MOUNT failure)

文档解释ORA-07713:sksamtd:couldnotmountarchivaldevice(SYS$MOUNTfailure)Cause:VMSsystemserviceSYS$MOUNTfailedAction:ExaminesystemerrormessageandrefertoVMSdocumentati...

IT技术学习 ·2023-07-26