props基本用法
props数据验证
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<!--<cpn v-bind:cmovies="movies"></cpn>-->
<!--<cpn cmovies="movies" cmessage="message"></cpn>-->
<!-- 通过自定义属性，父组件将要传递的数据，传递给子组件 -->
<cpn :cmessage="message" :cmovies="movies"></cpn>
</div>
<template id="cpn">
<div>
<ul>
<li v-for="item in cmovies">{{item}}</li>
</ul>
<h2>{{cmessage}}</h2>
</div>
</template>
<script src="../js/vue.js"></script>
<script>
// 父传子: props
const cpn = {
template: '#cpn',
// 子组件通过 props 配置项，来指定要接收的数据
// props: ['cmovies', 'cmessage'],
props: {
// 1.类型限制
// cmovies: Array,
// cmessage: String,
// 2.提供一些默认值, 以及必传值
cmessage: {
// 类型要和父组件传递的数据类型一致，否则报错
type: String,
default: 'aaaaaaaa',
required: true
},
// 类型是对象或者数组时, 默认值必须是一个函数
cmovies: {
type: Array,
default() {
return []
}
}
},
}
const app = new Vue({
el: '#app',
data: {
message: '你好啊',
movies: ['海王', '海贼王', '海尔兄弟']
},
components: {
cpn
}
})
</script>
</body>
</html>
组件通信-父传子(props中的驼峰标识)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<!-- 要用段横杆，不能写成cInfo，浏览器会把所有的标签名、标签属性名识别为小写 -->
<cpn :c-info="info" :child-my-message="message" v-bind:class></cpn>
</div>
<template id="cpn">
<div>
<h2>{{cInfo}}</h2>
<h2>{{childMyMessage}}</h2>
</div>
</template>
<script src="../js/vue.js"></script>
<script>
const cpn = {
template: '#cpn',
// props中的属性可以用驼峰
props: {
cInfo: {
type: Object,
default() {
return {}
}
},
childMyMessage: {
type: String,
default: ''
}
}
}
const app = new Vue({
el: '#app',
data: {
info: {
name: 'why',
age: 18,
height: 1.88
},
message: 'aaaaaa'
},
components: {
cpn
}
})
</script>
</body>
</html>