//component A
Vue.component('my-button', {
props: ['title'],
template: `<button v-on:click="$emit('add-value')">{{title}}</button>`
});
Vue.component('my-viewer', {
props: ['counter'],
template: `<button>{{counter}}</button>`
});
new Vue({
el: '#app',
data: {
counter: 0,
},
methods: {
doSomething: function() {
this.counter++;
}
}
})
Vue.component('blog-post', {
props: ['title'],
template: '<h3>{{ title }}</h3>'
});
//parent
new Vue({
el: '#blog-post-demo',
data: {
posts: [{
id: 1,
title: 'My journey with Vue'
},
{
id: 2,
title: 'Blogging with Vue'
},
{
id: 3,
title: 'Why Vue is so fun'
}
]
}
});
Vue.component('blog-post2', {
props: ['post'],
template: `
<div class="blog-post">
<h3>{{ post.title }}</h3>
<button v-on:click="$emit('enlarge-text')">
Enlarge text
</button>
<div v-html="post.content"></div>
</div>`
})
new Vue({
el: '#blog-posts-events-demo',
data: {
posts: [{
id: 1,
title: 'My journey with Vue'
},
{
id: 2,
title: 'Blogging with Vue'
},
{
id: 3,
title: 'Why Vue is so fun'
}
],
postFontSize: 1
},
methods: {
onEnlargeText: function() {
this.postFontSize++;
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<p>Two components adding & viewing value</p>
<div id="app">
<my-button :title="'Add Value'" v-on:add-value="doSomething"></my-button>
<my-viewer :counter="counter"></my-viewer>
</div>
<br>
<br>
<p>Passing Data to Child Components with Props (Parent to Child)</p>
<div id="blog-post-demo">
<blog-post v-for="post in posts" v-bind:key="post.id" v-bind:title="post.title"></blog-post>
</div>
<p>Listening to Child Components Events (Child to Parent)</p>
<div id="blog-posts-events-demo">
<div :style="{ fontSize: postFontSize + 'em' }">
<blog-post2 v-for="post in posts" v-bind:key="post.id" v-bind:post="post" v-on:enlarge-text="onEnlargeText"></blog-post2>
</div>
</div>
首先，您需要一个父组件，以便两个组件可以通信。当my-button 组件被点击时触发事件add-value 调用doSomething() 函数，然后更新值并将其显示到my-viewer 组件。
HTML
<!--PARENT-->
<div id="app">
<!--CHILD COMPONENTS-->
<my-button :title="'Add Value'" v-on:add-value="doSomething"></my-button>
<my-viewer :counter="counter"></my-viewer>
</div>
VUE.JS
//component A
Vue.component('my-button',{
props:['title'],
template:`<button v-on:click="$emit('add-value')">{{title}}</button>`
});
//Component B
Vue.component('my-viewer',{
props:['counter'],
template:`<button>{{counter}}</button>`
});
//Parent
new Vue({
el: '#app',
data:{
counter:0,
},
methods:{
doSomething:function(){
this.counter++;
}
}
})
这是基于Vue Components Guide
使用 Props 将数据传递给子组件（Parent to Child）
VUE.JS
//component (child)
//Vue component must come first, else it won't work
Vue.component('blog-post', {
/*Props are custom attributes you can register on a component. When a
value is passed to a prop attribute, it becomes a property on that
component instance*/
props: ['title'],
template: '<h3>{{ title }}</h3>'
});
//parent
new Vue({
el: '#blog-post-demo',
data: {
posts: [
{ id: 1, title: 'My journey with Vue' },
{ id: 2, title: 'Blogging with Vue' },
{ id: 3, title: 'Why Vue is so fun' }
]
}
});
HTML：
v-for 将循环发布帖子并将数据传递给blog-post 组件
<div id="blog-post-demo">
<blog-post v-for="post in posts"
v-bind:key="post.id"
v-bind:title="post.title"></blog-post>
</div>
监听子组件事件（子到父）
HTML
您必须先通过v-on:enlarge-text="onEnlargeText" 注册事件才能使用$emit，并确保它始终设置为小写，否则将无法正常工作。例如enlargeText 和Enlargetext 将始终转换为enlargetext，因此请改用放大文本，因为它易于阅读且有效，有关$emit 的简要说明，您可以阅读here
<div id="blog-posts-events-demo">
<div :style="{ fontSize: postFontSize + 'em' }">
<blog-post
v-for="post in posts"
v-bind:key="post.id"
v-bind:post="post"
v-on:enlarge-text="onEnlargeText"></blog-post>
</div>
</div>
VUE.JS
当用户单击button 时，v-on:click="$emit('enlarge-text')" 将触发然后调用父级中的函数onEnlargeText()
//component (child)
Vue.component('blog-post', {
props: ['post'],
template: `
<div class="blog-post">
<h3>{{ post.title }}</h3>
<button v-on:click="$emit('enlarge-text')">
Enlarge text
</button>
<div v-html="post.content"></div>
</div>`
})
//parent
new Vue({
el: '#blog-posts-events-demo',
data: {
posts: [
{ id: 1, title: 'My journey with Vue' },
{ id: 2, title: 'Blogging with Vue' },
{ id: 3, title: 'Why Vue is so fun' }
],
postFontSize: 1
},
methods:{
onEnlargeText:function(){
this.postFontSize++;
}
}
})