Vue Router基础

一、修改路口方法main.js
1、引入VueRouter， import VueRouter from 'vue-router'
2、配置路由列表，在main.js同级目录下新建routes.js，
引入路由列表 import routes from './routes'
3、使用 Vue.use(VueRouter) 注册，以便全局使用
4、初始化一个VueRouter实例 router

const router = new VueRouter({
  routes,
})

5、把router注册到Vue实例，以便全局使用this.$router

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

完整代码如下

import Vue from 'vue'
import VueRouter from 'vue-router'
import App from './App.vue'
import routes from './routes'

Vue.config.productionTip = false

Vue.use(VueRouter)

const router = new VueRouter({
  mode: 'history',
  routes,
})

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

二、App.vue
增加 router-view 这个组件，router-view 是VueRouter提供的一个全局组件

<template>
  <div id="app">
    <h2>router demo</h2>
    <router-view></router-view>
  </div>
</template>

<script>

export default {
  name: 'app',
  components: {
  },
}
</script>

三、路由配置列表 routes.js
1、引入两个组件

import RouterDemo from './components/RouterDemo'
import RouterChildrenDemo from './components/RouterChildrenDemo'

2、增加简单路由配置

• 路径 /pagea 被渲染到 <router-view />
  { path: '/pagea', component: RouterDemo, name: 'this is page a' }

3、增加嵌套的路由配置
① path: '/user/:id'，动态路径，id是个动态变量，
② props: true，为了将动态变量id做为属性，传给组件RouterDemo，
所以要在RouterDemo.vue中，申明了一个属性id

<script>
export default {
  props: ['id'],
  ...
</script>

③ 定义 /user/:id 路径后的子路径，会被渲染在父组件 RouterDemo 的 <router-view/> 中
例如： /user/:id/childrenPath1 和 /user/:id/childrenPath2

    children: [
      {
        path: 'childrenPath1',
        component: RouterChildrenDemo
      },
      {
        path: 'childrenPath2',
        component: RouterChildrenDemo
      }
    ]

4、 定义重定向，例如把路径/a重定向到/pageb，{ path: '/a', redirect: '/pageb' }
5、兜底路径策略，写在路由配置最后，如果上面的路由没有被命中，则执行本条规则，注意这里path用了 *
{ path: '*', component: RouterDemo, name: '404' }

完整代码如下

import RouterDemo from './components/RouterDemo'
import RouterChildrenDemo from './components/RouterChildrenDemo'

const routes = [
  { path: '/pagea', component: RouterDemo, name: 'this is page a' },
  { path: '/pageb', component: RouterDemo, name: 'this is page b' },
  // 当 /user/:id 匹配成功，
  // RouterDemo 会被渲染在 App 的 <router-view /> 中
  { path: '/user/:id', 
    component: RouterDemo, 
    name: 'this is page user id',
    props: true,
    children: [
      {
        // 当 /user/:id/profile 匹配成功，
        // RouterChildrenDemo 会被渲染在 RouterDemo 的 <router-view/> 中
        path: 'profile',
        component: RouterChildrenDemo,
        name: 'this is page user profile'
      },
      {
        // 当 /user/:id/posts 匹配成功
        // RouterChildrenDemo 会被渲染在 RouterDemo 的 <router-view/> 中
        path: 'posts',
        component: RouterChildrenDemo
      }
    ]
  },
  { path: '/a', redirect: '/pageb' },
  { path: '*', component: RouterDemo, name: 'this is 404 page' }
]

export default routes

四、RouterDemo.vue
1、router-link 也是VueRouter提供的一个全局组件，实现路由跳转
2、api形式的路由跳转， $router.push('foo')

<template>
  <div>
    <router-link to="/pagea">Go to Page A</router-link>
    <br/>
    <router-link to="/user/12">Go to /user/12</router-link>
    <br/>
    <router-link to="/user/12/profile">Go to /user/12/profile</router-link>
    <br/>
    <router-link to="/other">Go to 404 page</router-link>
    <br/>
    <router-link to="/a">Go to a 重定向到 Go to Page B</router-link>
    <br/>
    <a href="/pagea">Go to Page A ？？？</a>
    <br/>
    <a href="#/pagea">Go to Page A</a>
    <br/>
    <button @click="$router.push('pagea')">Go to Page A</button>
    <p>id: {{id}}</p>
    <p>{{routerInfo}}</p>
    <router-view></router-view>
  </div>
</template>
<script>
export default {
  props: ['id'],
  computed: {
    routerInfo() {
      const { fullPath, path, name, params, query, meta } = this.$route
      return {
        fullPath, path, name, params, query, meta
      }
    }
  }
}
</script>

五、RouterChildrenDemo.vue

<template>
  <div>
    {{routerInfo}}
  </div>
</template>
<script>
export default {
  computed: {
    routerInfo() {
      const { fullPath, path, name, params, query, meta } = this.$route
      return {
fullPath, path, name, params, query, meta
      }
    }
  }
}
</script>