Cannot read properties of undefined (reading 'key')

"Cannot read properties of undefined"是JavaScript中的一个常见错误。它表示在访问一个未定义或null值的属性时发生了错误。根据引用和引用的信息，这个错误可能是由于后台返回的key值重复或者在代码中使用了错误的变量名导致的。在引用中，也提到了类似的错误，即尝试访问一个未定义的变量。要解决这个问题，你可以检查代码中涉及到key的部分，并确保key是正确定义和赋值的。另外，你还可以使用调试工具，如浏览器的开发者工具，来定位并解决错误发生的具体位置。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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- *1* [Cannot read properties of undefined (reading ‘key‘)](https://blog.csdn.net/weixin_52740695/article/details/129335546)[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_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *2* [Vue中报错：“TypeError: Cannot read properties of undefined (reading ‘key‘)](https://blog.csdn.net/try_hard_more/article/details/125238949)[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_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *3* [jQuery 出现Cannot read property ‘msie’ of undefined错误的解决方法](https://download.csdn.net/download/weixin_38693586/14805574)[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_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
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