1、props通信
注意：DOM模板的驼峰命名props要转为短横分割命名。
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<title>Vue</title>
</head>
<body>
<div id="app">
<my-component message='来自父组件的数据' warning-text="提示信息"></my-component>
</div>
<script src="https://cdn.bootcss.com/vue/2.5.9/vue.min.js"></script>
<script type="text/javascript">
Vue.component('my-component', {
template: '<div>{{warningText}}：{{message}}</div>',
props: ['message', 'warningText']
})
new Vue({
el: "#app"
})
</script>
</body>
</html>
传递动态数据（v-bind）：
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<title>Vue</title>
</head>
<body>
<div id="app">
<input type="text" v-model="parentMessage" />
<my-component :message='parentMessage'></my-component>
</div>
<script src="https://cdn.bootcss.com/vue/2.5.9/vue.min.js"></script>
<script type="text/javascript">
Vue.component('my-component', {
template: '<div>{{message}}</div>',
props: ['message']
})
new Vue({
el: "#app",
data: {
parentMessage: ''
}
})
</script>
</body>
</html>
2、单向数据流
（1）子组件保存父组件传递过来的值，在子组件自己的作用域下修改和使用。
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<title>Vue</title>
</head>
<body>
<div id="app">
<my-component :init-count='1'></my-component>
</div>
<script src="https://cdn.bootcss.com/vue/2.5.9/vue.min.js"></script>
<script type="text/javascript">
Vue.component('my-component', {
template: '<div>{{initCount}}</div>',
props: ['initCount'],
data: function() {
return this.initCount
}
})
new Vue({
el: "#app"
})
</script>
</body>
</html>
（2）使用计算属性
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<title>Vue</title>
</head>
<body>
<div id="app">
<my-component :width='100'></my-component>
</div>
<script src="https://cdn.bootcss.com/vue/2.5.9/vue.min.js"></script>
<script type="text/javascript">
Vue.component('my-component', {
template: '<div :style="style">组件内容</div>',
props: ['width'],
computed: {
style: function() {
return {
this.width + 'px'
}
}
}
})
new Vue({
el: "#app"
})
</script>
</body>
</html>