[Vue warn]: Error in v-on handler: "TypeError: Cannot read properties of undefined (reading 'id')"

这个错误通常是由于在访问未定义的属性时引起的。在这个例子中，错误是由于在删除最后一行时，`this.list`数组为空，因此`this.list.at(-1)`返回`undefined`，而`undefined`没有`id`属性，因此会抛出“Cannot read properties of undefined (reading 'id')”错误。

为了解决这个问题，可以在访问`id`属性之前检查`this.list.at(-1)`是否为`undefined`。可以使用JavaScript中的可选链操作符`?.`来实现这一点。更改代码如下：

const asset = {
  id: (this.list.at(-1)?.id || 0) + 1,
  name: this.name,
  price: this.price,
  time: new Date()
}

这样，如果`this.list`为空，则`this.list.at(-1)?.id`将返回`undefined`，然后`undefined || 0`将返回0，因此`id`将被设置为1。

相关问题

[Vue warn]: Error in v-on handler: "TypeError: Cannot read properties of undefined (reading 'init')"

这个错误提示是由于在Vue的`v-on`事件处理程序中发生了错误，错误信息是"TypeError: Cannot read properties of undefined (reading 'init')"。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [Vue报错：Error in v-on handler: “TypeError: Cannot read properties of undefined (reading ‘skuId‘)...](https://blog.csdn.net/weixin_56035334/article/details/125550545)[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^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
- *2* *3* [[Vue warn]: Error in v-on handler: “TypeError: Cannot read properties of undefined (reading ‘id‘)...](https://blog.csdn.net/moly_moly/article/details/126527431)[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^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
[ .reference_list ]

[Vue warn]: Error in v-on handler: "TypeError: Cannot read properties of undefined (reading 'setCheckedKeys')"

引用中提到的错误信息"[Vue warn]: Error in v-on handler: "TypeError: Cannot read properties of undefined (reading 'setCheckedKeys')"通常是由于在Vue的v-on事件处理程序中尝试访问未定义的属性而引起的。引用中指出，当点击按钮时，传递给实参cart的值为undefined，导致下面的skuId无法获取到值。这意味着在Vue组件中，可能存在未正确传递参数或未定义相关属性的问题。

在引用所提供的代码中，我未找到与错误信息中的"setCheckedKeys"相关的内容。可能是因为该代码片段不包含涉及到"setCheckedKeys"的逻辑。如果想要找到导致该错误的原因，需要进一步检查代码中与"setCheckedKeys"相关的部分，确保相应的属性被正确定义和传递。

解决这个问题的一种方法是确保在Vue组件中正确定义和初始化相关属性，以及在使用这些属性之前进行必要的检查和处理。另外，还可以通过调试工具来查找代码中具体出错的位置，并进行修复。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *2* [Vue报错：Error in v-on handler: “TypeError: Cannot read properties of undefined (reading ‘skuId‘)...](https://blog.csdn.net/weixin_56035334/article/details/125550545)[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%"]
- *3* [[Vue warn]: Error in v-on handler: “TypeError: Cannot read properties of undefined (reading ‘id‘)...](https://blog.csdn.net/moly_moly/article/details/126527431)[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%"]
[ .reference_list ]