Vue.component('my-button', {
props: ['title'],
template: `<button v-on:click="$emit('add-value')">{{title}}</button>`
});
Vue.component('my-viewer', {
props: ['counter'],
template: `<button>{{counter}}</button>`
});
new Vue({
el: '#app',
data: {
counter: 0,
},
methods: {
doSomething: function() {
this.counter++;
}
}
})
Vue.component('blog-post', {
props: ['title'],
template: '<h3>{{ title }}</h3>'
});
new Vue({
el: '#blog-post-demo',
data: {
posts: [{
id: 1,
title: 'My journey with Vue'
},
{
id: 2,
title: 'Blogging with Vue'
},
{
id: 3,
title: 'Why Vue is so fun'
}
]
}
});
Vue.component('blog-post2', {
props: ['post'],
template: `
<div class="blog-post">
<h3>{{ post.title }}</h3>
<button v-on:click="$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。当单击
my-button
组件时,会触发
add-value
事件,该事件调用
doSomething()
函数,然后更新值并将其显示到
my-viewer
组件中。
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
Vue.component('my-button',{
props:['title'],
template:`<button v-on:click="$emit('add-value')">{{title}}</button>`
});
Vue.component('my-viewer',{
props:['counter'],
template:`<button>{{counter}}</button>`
});
new Vue({
el: '#app',
data:{
counter:0,
},
methods:{
doSomething:function(){
this.counter++;
}
}
})
这是基于Vue组件指南的内容。
使用Props将数据传递给子组件(从父到子)
VUE.JS
Vue.component('blog-post', {
props: ['title'],
template: '<h3>{{ title }}</h3>'
});
new Vue({
el: '#blog-post-demo',
data: {
posts: [
{ id: 1, title: 'My journey with Vue' },
{ id: 2, title: 'Blogging with Vue' },
{ id: 3, title: 'Why Vue is so fun' }
]
}
});
HTML:
v-for
将循环遍历文章并将数据传递给blog-post
组件
<div id="blog-post-demo">
<blog-post v-for="post in posts"
v-bind:key="post.id"
v-bind:title="post.title"></blog-post>
</div>
监听子组件事件(子到父)
HTML
首先,您必须通过v-on:enlarge-text="onEnlargeText"
注册事件,以使用$emit
并确保它始终设置为小写,否则它将无法正常工作。例如,enlargeText
和Enlargetext
将始终转换为enlargetext
,因此请改用enlarge-text
,因为它易于阅读且有效。有关$emit
的简要说明,请在这里阅读。
<div id="blog-posts-events-demo">
<div :style="{ fontSize: postFontSize + 'em' }">
<blog-post
v-for="post in posts"
v-bind:key="post.id"
v-bind:post="post"
v-on:enlarge-text="onEnlargeText"></blog-post>
</div>
</div>
VUE.JS
当用户点击 button
按钮后,v-on:click="$emit('enlarge-text')"
将被触发,随后调用父组件中的 onEnlargeText()
函数。
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>`
})
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++;
}
}
})