Error in v-on handler: "TypeError: Cannot read properties of undefined (reading 'children')"

你遇到的错误是"Error in v-on handler: TypeError: Cannot read properties of undefined (reading 'children')"，这个错误通常发生在Vue.js组件中。根据你提供的引用内容，我注意到你可能遇到了两个不同的问题，分别与el-cascader组件和el-pagination组件有关。

对于el-cascader组件的问题，你可以尝试给级联选择器绑定一个key值，并使用watcher监听options的变化。当options变化时，改变key值，从而触发组件的重新渲染。这可能会解决TypeError: Cannot read properties of undefined (reading 'children')的错误。

而对于el-pagination组件的问题，错误的原因可能是在使用el-pagination组件时，某些属性的值未定义或为空。你需要确保在使用el-pagination组件时，total、page-size和current-page这些属性值都正确地获取到了相应的值。确保这些值是定义的，并且与组件的要求相匹配，可以避免这个错误的发生。

希望这些解决办法能够帮助你解决问题。如果问题仍然存在，请提供更多的上下文信息，以便我能够更好地帮助你解决问题。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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