vue-router 4使用实例详解

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npm install vue-router@4 

或

yarn add vue-router@4

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"dependencies": {
 "vue": "^3.2.16",
 "vue-router": "4"
},

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import { createRouter,createWebHashHistory } from "vue-router";

const routes = [
 {
  path:'',
  component:()=>import("../views/login/index.vue")
 },
 {
  path:'/home',
  component:()=>import("../views/home/index.vue")
 }
]

const router = createRouter({
 history:createWebHashHistory('/'),
 routes
})

export default router

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import { createApp } from 'vue'
import App from './App.vue'
import router from "./router/index"

const app = createApp(App)
app.use(router)
app.mount('#app')

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//动态添加路由--默认添加到根
router.addRoute({
 path:'/my',
 name:'my',
 component:()=>import("../views/my/index.vue")
})

//动态添加子路由
router.addRoute('my',{
 path:'/info',
 component:()=>import("../views/my/info.vue")
})

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<template>
  <button @click="backToHome">跳转到首页</button>
</template>

<script>
import { useRouter } from "vue-router"
export default {
 setup(){
  const router = useRouter()
  return{
   backToHome(){
    router.push("/")
   },
  }
 }
}
</script>

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<template>
  <div>监听路由变化</div>
</template>

<script>
import { useRouter,useRoute } from "vue-router"
import { watch } from "@vue/runtime-core"
export default {
 setup(){
  const route = useRoute()
  //route时响应式对象，可监控变化
  watch(()=>route.query,query=>{
   console.log('最新的',query)
  })
 }
}
</script>

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router.beforeEach((to,from,next)=>{
 console.log('全局前置守卫');
})
router.afterEach((to,from)=>{
 console.log('全局后置钩子');
})

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router.addRoute({
 path:'/my',
 name:'my',
 component:()=>import("../views/my/index.vue"),
 beforeEnter:(to,from)=>{
  console.log('路由独享守卫');
 }
})

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<script>
import {  onBeforeRouteLeave } from "vue-router"
export default {
 setup(){
 onnBeforeRouteLeave((to,from)=>{
  const answer = window.confirm('是否确认离开')
  if(answer){
   console.log('不离开');
   return false
  }
  })
 }
}
</script>

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//以前创建方式
const router = new VueRouter({
 
})
new Vue({
 router,
 render:h=>h(App)
}).$mount("#app")

//vue-router4创建方式
import { createRouter } from "vue-router"
const router = createRouter({

})
createApp(App).use(router).mount("#app")

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//之前
const router = new VueRouter({
 mode:"hash"
})

//新的
import { createRouter, createWebHashHistory } from "vue-router"
const router = createRouter({
 history:createWebHashHistory()
})

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//之前
const router = new VueRouter({
 base:"/"
})

//新的
import { createRouter, createWebHashHistory } from "vue-router"
const router = createRouter({
 history:createWebHashHistory('/')
})

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//之前
{
 path:'*',
 component:()=>import("../components/NotFound.vue")
}

//vue-router 4
{
 path:'/:pathMatch(.*)*',
 component:()=>import("../components/NotFound.vue")
}
//是一个正则表达式

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//之前
router.onReady(onSuccess,onError)//成功和失败回调

//vue-router 4
router.isReady().then(()=>{
 //成功
}).catch(err=>{
 //失败
})

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const router = createRouter({
 scrollBehavior(to, from, savedPosition) {
  // 始终滚动到顶部
  return { top: 0, left:0 }
 },
})
//之前使用的{ x:0, y:0 } 替换成了 { top: 0, left:0 }

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//之前
<keep-alive>
 <router-view />
</keep-alive>

//vue-router 4
<router-view v-slot="{component}">
 <keep-alive>
  <component :is="component" />
 </keep-alive>
</router-view>

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//之前
<router-link to="child" append >跳转<router-link>

//vue-router 4
<router-link :to="append( $route.path , 'child' )" append >跳转<router-link>

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//之前
<router-link to="/" tag="span">跳转</router-link>

//vue-router 4
<router-link to="/" custom>
 <span>跳转</span>  
</router-link>