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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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---
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将所提供的界面进行一个优化
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---
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制作界面
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