vue2中可以用vue-router4的版本吗

Vue2和Vue3使用的Vue Router版本是不同的，Vue2需要使用Vue Router 3.x版本，而Vue3需要使用Vue Router 4.x版本。虽然Vue2和Vue3之间的区别较大，但是Vue Router的基本使用方式是相似的，所以你可以在Vue2中使用Vue Router 4.x版本，但是需要注意一些变化和兼容性问题。建议还是使用Vue Router 3.x版本更为稳定和兼容。

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。

vue2使用哪个版本的vue-router

在使用Vue2时，可以使用vue-router的2.x版本，该版本代码库中的文件名应为vue-router.min.js。可以通过以下方式安装vue-router:

npm install vue-router@2.x --save

然后在Vue应用程序中引入：

import Vue from 'vue'
import VueRouter from 'vue-router'

Vue.use(VueRouter)

const router = new VueRouter({
  // 配置路由规则
})

new Vue({
  router,
  render: h => h(App)
}).$mount('#app')

在Vue应用程序中使用vue-router时，需要注意Vue和vue-router的版本兼容性。Vue2.x与vue-router2.x兼容，Vue3.x与vue-router4.x兼容。