A partir do ECMAScript 2020, pode-se utilizar a sintaxe do encadeamento opcional, que faz curto circuito avaliando a expressão para undefined assim que o acesso de propriedade a null ou undefined é efetivado. With that out of the way we can start to understand why trying to access a property of null or … Asking for help, clarification, or responding to other answers. I'm using Firebase with react-native to authenticate users. 出现以下错误，说通俗点就是 三层表达式a.b.c，在对象a中没有对象b，那么读取对象a.b.c中的值，自然会报错。. 0. Unhandled Rejection (TypeError): … TypeError TypeError: Cannot read property 'ɵprov' of undefined . 为什么使用vue-pdf插件会导致'catch' of undefined-前端-CSDN问答 jackycchen commented on Apr 3, 2019. COVID-19 Update: pine log state forest pitcher plants south park live action commercials … I'm using Discord.js V12. Uncaught TypeError: Cannot read property 'foo' of undefined. Thanks for contributing an answer to Stack Overflow! 阅读 12.2K 0. TypeError: Cannot read property 'plnx' of unde fined - GitHub 项目在 Dev 环境没有问题，部署上生产环境出现报错。 TypeError: Cannot read properties of undefined (reading 'catch') at jt.d.a.push 复制代码. TypeError: Cannot read property 'map' of undefined, in react … hubot-slack - TypeError: Eigenschaft 'catch' von undefined kann …