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Uncaught TypeError: Cannot read properties of undefined (rea

vue页面UncaughtTypeError:Cannotreadpropertiesof undefined (reading‘install’)报错，页面全空白。然后发现是自己写的指令全局引用的原因使用了export导出export{preventReClick}复制代码...

开发笔记 ·2024-09-29

layer出现Uncaught ReferenceError: layer is not defined错误

layer出现UncaughtReferenceError:layerisnotdefined错误的原因，代码如下：//layui的JavaScript代码区域layui.use('layer',function(){varlayer=layui.layer;var$=layui.$;//获得layui中的jquery...

开发笔记 ·2024-09-29

null和undefined的区别

null和undefined都是js中的特殊值，表示缺失或未定义的值。null表示一个空对象指针，即该变量本应该指向一个对象，但是现在没有指向任何一个对象。例如：varobj=null;undefined表示一个未定义的值，即该变量没有被赋值或者被赋值为undefined。例如：varx;console.log(x);...

开发笔记 ·2024-07-02

ORA-47000: Factor Type string already defined

文档解释ORA-47000:FactorTypestringalreadydefinedCause:TheobjectwiththisnameexistsalreadyAction:ChooseauniqueobjectnameandretrytheoperationORA-47000是一个通用错误，称为“因素类型st...

IT技术学习 ·2023-07-28

ORA-29922: Invalid rowid returned by the user-defined query methods

文档解释ORA-29922:Invalidrowidreturnedbytheuser-definedquerymethodsCause:Aninvalidrowidentifierwasreturnedbytheuser-definedquerymethods.Action:Checktheimplementatio...

IT技术学习 ·2023-07-28

ORA-42031: interim table cannot have a commit SCN-based MV log defined on it

文档解释ORA-42031:interimtablecannothaveacommitSCN-basedMVlogdefinedonitCause:AnattemptwasmadetouseaninterimtablewhichhadacommitSCN-basedmaterialzedviewlogdefinedon...

IT技术学习 ·2023-07-28

ORA-47040: Identity string for Factor string already defined

文档解释ORA-47040:IdentitystringforFactorstringalreadydefinedCause:TheobjectwiththisnameexistsalreadyAction:ChooseauniqueobjectnameandretrytheoperationORA-47040错误OR...

IT技术学习 ·2023-07-28

ORA-30510: system triggers cannot be defined on the schema of SYS user

文档解释ORA-30510:systemtriggerscannotbedefinedontheschemaofSYSuserCause:AnattemptwasmadetodefineasystemtriggerontheschemaofSYSuser.Thistypeoftriggerisnotsupportedc...

IT技术学习 ·2023-07-28

ORA-53039: user-defined preference document: string already exists

文档解释ORA-53039:user-definedpreferencedocument:stringalreadyexistsCause:Theinsertoperationfailedbecauseonlyoneuser-definedpreferencedocumentisallowed.Action:Tocha...

IT技术学习 ·2023-07-27

ORA-53414: The DICOM object contains undefined values string.

文档解释ORA-53414:TheDICOMobjectcontainsundefinedvaluesstring.Cause:TheDICOMobjecthadattributevaluesthatwereexpectedtobepartofthedatamodel.Action:DetermineiftheDICO...

IT技术学习 ·2023-07-26

ORA-19576: datafile string not defined in control file

文档解释ORA-19576:datafilestringnotdefinedincontrolfileCause:Thespecifiedfilenumberwasnotfoundinthecontrolfile.Action:Specifyacorrectfilenumberandretrytheoperation....

IT技术学习 ·2023-07-26

ORA-31504: cannot alter or drop predefined change source

文档解释ORA-31504:cannotalterordroppredefinedchangesourceCause:ThecallerattemptedtoalterordroponeofthepredefinedchangesourcesHOTLOG_SOURCEorSYNC_SOURCE.Action:Donot...

IT技术学习 ·2023-07-26

ORA-19257: XQST0037 – function or variable string in module already defined

文档解释ORA-19257:XQST0037–functionorvariablestringinmodulealreadydefinedCause:Amodulebeingimportedcontainedthefunctionorvariablethatisalreadydeclaredinthesta...

IT技术学习 ·2023-07-26

ORA-32035: unreferenced query name defined in WITH clause

文档解释ORA-32035:unreferencedquerynamedefinedinWITHclauseCause:ThereisatleastoneWITHclausequerynamethatisnotreferencedinanyplace.Action:removetheunreferencedqueryn...

IT技术学习 ·2023-07-26

ORA-16195: DG_CONFIG requires DB_UNIQUE_NAME be explicitly defined

文档解释ORA-16195:DG_CONFIGrequiresDB_UNIQUE_NAMEbeexplicitlydefinedCause:TheDG_CONFIGattributeoftheLOG_ARCHIVE_CONFIGparametercanonlybeusediftheDB_UNIQUE_NAMEparam...

IT技术学习 ·2023-07-26