195 lines
2.7 KiB
Markdown
195 lines
2.7 KiB
Markdown
### 安装 vue-router
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yarn add vue-router
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### 准备:用vue-cli 新建文件
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1.终端打开你当前目录 vue create +项目名
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2.把 src/App.vue 文件重写为空白模板
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3.在src/components目录下新建两个组件(a,b)
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4. 在src/main.js 里引入 vue-router
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>import VueRouter from 'vue-router'
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注册使用:
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>Vue.use(VueRouter)
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### 正式使用 vue-router
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1.在src/main.js中 定义 路径及映射的组件
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```
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const routes= [
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{ path: "/a", component: aa },
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{ path: "/b", component: bb },
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]
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```
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2.实例化 VuRouter
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```
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const router = new VueRouter({
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routes // (缩写) 相当于 routes: routes
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})
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```
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3.渲染
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(1) 在src/main.js中
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```
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new Vue({
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el: '#app',
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router,
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render: h => h(App)
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})
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```
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(2) 在src/app.vue 中 的id为 app 的div内部写入 router-view标签
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```
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<template>
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<div id="app">
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<router-view></router-view>
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</div>
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</template>
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```
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全部代码:
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app.vue
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```
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<template>
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<div id="app">
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<router-view></router-view>
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</div>
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</template>
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<script>
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</script>
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<style>
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</style>
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```
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main.js
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```
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import Vue from 'vue'
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import App from './App.vue'
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import VueRouter from 'vue-router'
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import aa from "./components/a.vue";
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import bb from "./components/b.vue";
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Vue.use(VueRouter)
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Vue.config.productionTip = false
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const routes= [
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{ path: "/a", component: aa },
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{ path: "/b", component: bb },
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]
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const router = new VueRouter({
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routes // (缩写) 相当于 routes: routes
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})
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new Vue({
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el: '#app',
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router,
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render: h => h(App)
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})
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```
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a.vue
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```
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<template>
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<div class="hello">
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<div>这是aaa</div>
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</div>
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</template>
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<script>
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export default {
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name: 'aa',
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}
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</script>
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<style scoped>
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</style>
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```
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b.vue (组件b)
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```
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<template>
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<div>
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<div>这是bbb</div>
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</div>
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</template>
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<script>
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export default {
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name:"b"
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}
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</script>
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<style>
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</style>
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```
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### vuerouter 动态路由匹配
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1.定义: 把匹配到的部分或全部路由,全都映射到一个组件
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2.使用: 动态路径参数 用: 开头
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(1)在main.js 的路由定义中:
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{ path: "/a", component: aa },
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修改为:
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{ path: "/a/:参数名", component: 映射的组件名 },
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(2) 在映射的组件中获取传入的动态参数的值
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在引入的组件中 使用 {{ $route.params.参数名}} 获取参数的值
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2.注:
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当使用路由参数时,映射的组件会重复使用,都渲染相同组件,比起销毁再创建,速度会更快
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但是,组件挂载的事件不会重复调用
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如果要检测页面跳转,只能用watch 监听 $route对象或者使用beforeRouteUpdate 导航守卫
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### 导航守卫
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1.全局导航守卫
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(1) 在 main.js中的 导出模块里 通过watch 监听 $route 对象
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```
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``` |