def主题的文章列表，还有def的技术要点_第1页

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

C++ 中using 与 typedef

using关键字在C++中由来已久，使用得也比较多，现代C++进一步扩展了其应用范围，目前using可以用在以下场景中：命名空间声明命名空间成员声明类成员声明类继承构造类型别名与模板别名其中的4，5是现代C++对using关键字应用范围的扩展，5是用来替代typedef的。代码示例：#include#inc...

开发笔记 ·2024-08-27

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-53048: definer name DICOM is not allowed in a private dictionary

文档解释ORA-53048:definernameDICOMisnotallowedinaprivatedictionaryCause:TheoperationfailedbecausethedefinernameDICOMwasfoundintheprivatedictionary.Action:Correctthe...

IT技术学习 ·2023-07-28

ORA-53432: The DICOM object attribute string has invalid definer name.

文档解释ORA-53432:TheDICOMobjectattributestringhasinvaliddefinername.Cause:AprivateattributedefinerforaprivateattributecontainedinthisDICOMobjecthadinvalidcharacter...

IT技术学习 ·2023-07-28

ORA-24303: call not supported in non-deferred linkage

文档解释ORA-24303:callnotsupportedinnon-deferredlinkageCause:Oneofthecallsthatissupportedindeferredmodelinkageexclusivelywasinvokedwhentheclientwaslinkednon-deferre...

IT技术学习 ·2023-07-28

ORA-29533: attempt to overwrite class or resource string while defining or compiling string.string

文档解释ORA-29533:attempttooverwriteclassorresourcestringwhiledefiningorcompilingstring.stringCause:AclassorresourcedefinedbyaSQLJsourceconflictedwithanexistingobje...

IT技术学习 ·2023-07-28

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-42036: cannot online redefine temporary table “string”.”string”

文档解释ORA-42036:cannotonlineredefinetemporarytable“string”.”string”Cause:Anattemptwasmadetoredefineatemporarytable.Action:Donotattempttoon...

IT技术学习 ·2023-07-28

ORA-64106: Incorrect use of comma(,) punctuation in COLUMN definitions.

文档解释ORA-64106:Incorrectuseofcomma(,)punctuationinCOLUMNdefinitions.Cause:AnattemptwasmadetodefineCOLUMNSwithincorrectuseofcommapunctuation.Action:Properlysepara...

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-53032: The default preference document cannot be found.

文档解释ORA-53032:Thedefaultpreferencedocumentcannotbefound.Cause:Thedeleteoperationfailedduetoaninternalerror.Action:Whenauser-definedpreferencedocumentisdeleted,t...

IT技术学习 ·2023-07-28

ORA-23666: Default column group in use by DML conflict handler “string”

文档解释ORA-23666:DefaultcolumngroupinusebyDMLconflicthandler“string”Cause:AdefaultcolumngroupwasfoundforthespecifiedApplyname,operationname,andconflict...

IT技术学习 ·2023-07-28