#undefined

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...

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-53414: The DICOM object contains undefined values string.

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

ORA-44415: Invalid ACL: Undefined privileges

文档解释ORA-44415:InvalidACL:UndefinedprivilegesCause:AnundefinedprivilegewasfoundinanACEintheACL.Action:Makesuretheprivilegeisdefinedinthesecurityclassasspecifiedi...

ORA-12463: undefined group string for policy string

文档解释ORA-12463:undefinedgroupstringforpolicystringCause:Thespecifiedgroupisnotdefinedforthepolicy.Action:Correctthegroupidentifiervalue.ORA-12463:undefinedgroups...

ORA-12462: undefined compartment string for policy string

文档解释ORA-12462:undefinedcompartmentstringforpolicystringCause:Thespecifiedcompartmentisnotdefinedforthepolicy.Action:Correctthecompartmentidentifiervalue.ORA-124...

ORA-23346: primary key or object ID is undefined for table or materialized view string

文档解释ORA-23346:primarykeyorobjectIDisundefinedfortableormaterializedviewstringCause:Tryingtogeneratereplicationsupportforatableormaterializedviewwithoutaprimaryk...

ORA-48465: The specified type [string] is undefined

文档解释ORA-48465:Thespecifiedtype[string]isundefinedCause:ThepurgetypespecifiedisundefinedAction:CheckthetypenameORA-48465错误是一种由于在PL/SQL中使用了未定义类型而导致的错误。官方解释当PL/SQL...

ORA-40391: PMML DerivedField depends on a undefined field: string

文档解释ORA-40391:PMMLDerivedFielddependsonaundefinedfield:stringCause:ADerivedFieldmayonlyreferenceotherdefinedfields.Action:MakesureDerivedFieldsreferenceotherdef...

ORA-12461: undefined level string for policy string

文档解释ORA-12461:undefinedlevelstringforpolicystringCause:Thespecifiedlevelisnotdefinedforthepolicy.Action:Correctthelevelidentifiervalue.ORA-12461:undefinedlevels...

ORA-40392: PMML regression equation references an undefined field: string

文档解释ORA-40392:PMMLregressionequationreferencesanundefinedfield:stringCause:Regressionequationdidnotreferencedefinedfields.Action:Regressionequationmayonlyrefere...

MySQL Error number: 3521; Symbol: ER_SRS_NOT_CARTESIAN_UNDEFINED; SQLSTATE: SR001

文档解释Errornumber:3521;Symbol:ER_SRS_NOT_CARTESIAN_UNDEFINED;SQLSTATE:SR001Message:Function%sisonlydefinedforCartesianspatialreferencesystems,butoneofitsarguments...
IT技术学习 ·2023-06-25

Fatal error: Uncaught Error: Call to undefined function ereg() in

当你的织梦后台删除或者更改东西的时候出现这个:Fatalerror:UncaughtError:Calltoundefinedfunctionereg()in/www/wwwroot/www.xxxxx.com/dede/,那说明你的PHP版本太高了,不兼容,这时候你需要把PHP版本调低一点。步骤一:打开宝塔步骤二:点...

undefined是什么意思

undefined,属于数据结构中的特殊字符,在高级程序设计语言设计应用程序时,用于指示变量尚未用单等号进行赋值。undefined,英译过来即“未定义”的意思。undefined,属于数据结构中的特殊字符,常出现在数据结构、C语言中,用来声明变量使用的。通常用于指示变量尚未赋值对未定义值的引用...
开发笔记 ·2022-11-19

聊聊javascript的null和undefined

只要是说到js的变量和数据类型,就脱不开null和undefined,这兄弟俩就是js的重要基础,不可不察,无数的同学们都用过放大镜多角度多批次地研究过这兄弟俩,真是深受欢迎。^-^js也真是怪异,有个null不够,还要折腾出个undefined。虽然被诟病,但这就是设计。 在c#和java中,null就是表...
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