Cannot read properties of undefined (reading 'concat')

"Cannot read properties of undefined (reading 'concat')"这个错误通常是在JavaScript代码中使用了未定义或为空的对象来调用concat方法造成的。在你的引用中，错误的原因可能是在v-on处理程序中使用了未定义的对象。另外，还有一个引用提到了缺少CommonMixin.js文件，可能也是导致错误的原因之一。你可以检查一下你的代码，确保正确引入了需要的文件，并且在使用对象之前先进行了定义或者判断是否为空。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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- *1* [Error in v-on handler: “TypeError: Cannot read properties of undefined (reading ‘concat‘)“报错](https://blog.csdn.net/qq_40086382/article/details/129314009)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
- *2* *3* [TypeError: Cannot read properties of undefined (reading ‘components‘)](https://blog.csdn.net/phhzhhh/article/details/120880082)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
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