error in ./node_modules/vue-router/dist/vue-router.mjs "export 'computed' was not found in 'vue'

这个错误通常出现在使用Vue Router时，版本不兼容的问题。请确保你的Vue版本与Vue Router版本兼容。另外，也要确保你已经正确安装了Vue和Vue Router，并且在使用之前正确导入它们。

你可以尝试以下几个步骤来解决这个问题：

1. 确认你的Vue版本是否与Vue Router兼容。可以在Vue Router的文档中查看它所支持的Vue版本。

2. 确保你已经正确安装了Vue和Vue Router。你可以通过运行`npm install vue vue-router`或`yarn add vue vue-router`来安装它们。

3. 检查你的代码中是否正确导入了Vue和Vue Router。你需要在使用Vue Router之前先导入Vue，并且在使用Vue Router时，需要正确导入相关的组件和方法。

4. 如果你使用的是ES模块语法（以`.mjs`结尾），请确保你的构建工具或打包工具正确地处理ES模块。有些构建工具可能需要额外的配置来支持ES模块。

如果上述步骤都没有解决问题，还可以尝试更新你的Vue和Vue Router版本，或者查看相关的错误信息以获取更多的线索。如果问题仍然存在，建议提供更多的上下文信息，以便更好地帮助你解决问题。

相关问题

WARN "css.modules" option in vue.config.js is deprecated now, please use "css.requireModuleExtension" instead. INFO Starting development server... 98% after emitting CopyPlugin WARNING Compiled with 17 warnings 09:43:57 warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'computed' was not found in 'vue' warning in ./src/router/index.js "export 'default' (imported as 'VueRouter') was not found in 'vue-router' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'defineComponent' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'getCurrentInstance' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'h' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'inject' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'nextTick' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'onActivated' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'onDeactivated' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'onUnmounted' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'provide' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'reactive' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'ref' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'shallowRef' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'unref' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'watch' was not found in 'vue' warning in ./node_modules/vue-router/dist/vue-router.mjs "export 'watchEffect' was not found in 'vue'这个报错因为什么

这个报错是因为在使用Vue Router时，导入的Vue Router版本与当前项目中的Vue版本不匹配导致的。具体来说，Vue Router中使用了Vue 3的语法而当前项目中使用的是Vue 2，所以会出现一些语法上的错误。解决方法是将Vue Router更新到与当前项目中使用的Vue版本相匹配的版本。