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# 笔记
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---
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1. 问题：
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```vue
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Title</title>
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</head>
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<body>
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<div id="app">
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<counter :num="count" @incr="add" @decr="reduce"></counter>
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</div>
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<script src="node_modules/vue/dist/vue.js"></script>
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<script>
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//定义局部组件
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const counter = {//声明自定义组件并设置其名称
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template:`<div>
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<button @click="handleAdd">+</button>
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<button @click="handleReduce">-</button>
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<h1>NUM:{{ num }}</h1>
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</div>`,//自定义组件
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props:['num'], //子组件接收title属性
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methods: {
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handleAdd(){
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this.$emit('incr');
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},
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handleReduce(){
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this.$emit("decr");
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}
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}
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};
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const app = new Vue({//(1)声明父级标签
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el:"#app", //element ,vue 作用的标签
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data:{
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count: 0,//id为app的标签对应的数据
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},
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components:{//声明组件，在id为app的组件当中声明子组件，其子组件为introduce
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counter
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},
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methods:{
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add(){
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this.count++;
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},
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reduce(){
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this.count--;
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}
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}
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});
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</script>
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</body>
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</html>
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```
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在这个代码中的NUM：{{ num }} 所表达的意思是什么呢？
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答：是prop动作的一个属性参数
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---
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路由：当我们想要实现一个跳转的功能，我们可以通过路由来实现。
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路由的格式：
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```js
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import * as VueRouter from 'vue-router'
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//注释；通常路由的路径是以一个对象的形式来进行跳转的。所以我们先定义一个变量来存放路径的对象。
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const RoutesList = [
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{
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path: '路径名',
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component: () => import('项目目录的view下面的视图组件。'),
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hidden: false //这是设置这个路径在项目初始化后的状态。是一个不可见的，只有访问后才可见。
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}
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]
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```
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----
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Vue 插件：
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Axios 、element-UI、js-cookie、normalize、vue-router、Vuex
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