组件是vue最强大的功能之一，组件化开发。
组件可以扩展HTML元素，封装可重用的代码。
组件可分为局部变量和全局变量。
全局变量:
<div id="app">
<comp></comp>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component('comp',{
template:`
<div>
<h1>{{msg}}</h1>
<button @click='alt'>点击查看歌名</button>
</div>
`
,
data:function(){
return{
msg:'在一瞬间有一百万个不可能。'
}
},
methods:{
alt:function(){
alert('一百万个不可能')
}
}
})
new Vue({
el:'#app',
})
</script>
局部变量：
<div id="app">
<comp></comp>
</div>
<script src="js/vue.js"></script>
<script>
new Vue({
el:"#app",
components:{
'comp':{
template:`
<ul>
<li>一百万个不可能</li>
<li>给陌生的你听</li>
<li>维也纳的冬天</li>
</ul>
`
}
}
})
</script>
组件--添加列表:
<div id="app">
<my-father></my-father>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component('my-father',{
template:`
<div>
<input type="text" v-model="txt"/>
<button @click="add">添加</button>
<my-list v-bind:fruit="arr"></my-list>
</div>
`
,
data:function(){
return{
arr:['苹果','香蕉','菠萝'],
txt:''
}
},
methods:{
add:function(){
this.arr.push(this.txt),
this.txt=''
}
}
})
Vue.component('my-list',{
props:['fruit'],
template:`
<ul>
<li v-for="(value,index) in fruit">{{value}} <button @click='delt(index)'>删除</button></li>
</ul>
`
,
methods:{
delt:function(ind){
this.fruit.splice(ind,1)
}
}
})
new Vue({
el:"#app",
})
</script>
组件---购物车:
<div id="app">
<my-father></my-father>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component('my-father',{
template:`
<div class="container">
<table class="table table-bordered text-center">
<thead>
<tr>
<th class='text-center'>编号</th>
<th class='text-center'>名称</th>
<th class='text-center'>单价</th>
<th class='text-center'>数量</th>
<th class='text-center'>小计</th>
</tr>
</thead>
<my-child v-bind:list='frulist'></my-child>
</table>
</div>
`
,
data:function(){
return{
frulist:[
{name:'apple',price:3,count:3,sub:9},
{name:'pear',price:4,count:4,sub:16},
{name:'mean',price:5,count:5,sub:25}
]
}
}
})
Vue.component('my-child',{
props:['list'],
template:`
<tbody>
<tr v-for="(value,index) in list">
<td>{{index+1}}</td>
<td>{{value.name}}</td>
<td>{{value.price}}</td>
<td>
<button @click="add(index)">+</button>
<span>{{value.count}}</span>
<button @click="redu(index)">-</button>
</td>
<td>{{value.sub}}</td>
</tr>
<tr>
<td colspan=5>总价:{{sum}}</td>
</tr>
</tbody>
`
,
data:function(){
return{
sum:0
}
},
methods:{
add:function(ind){
this.list[ind].count++;
//计算小计
this.list[ind].sub=this.list[ind].count*this.list[ind].price;
this.countSum();
},
redu:function(ind){
if(this.list[ind].count>1){
this.list[ind].count--
}
this.list[ind].sub=this.list[ind].count*this.list[ind].price;
this.countSum();
},
countSum:function(){
for(var i=0,total=0;i<this.list.length;i++){
total+=this.list[i].sub;
}
this.sum=total;
}
}
})
new Vue({
el:'#app',
})
</script>
组件---传值:
<div id="app">
<my-father></my-father>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component('my-father',{
template:`
<div>
<my-son v-bind:tit="title"></my-son>
<my-list v-bind:fruit="arr"></my-list>
</div>
`
,
data:function(){
return{
arr:['apple','banana','orange'],
title:'水果列表'
}
}
})
//获取title
Vue.component('my-son',{
props:['tit'],
template:`
<h2>{{tit}}</h2>
`
})
Vue.component('my-list',{
props:['fruit'],
template:`
<ul>
<li v-for="value in fruit">{{value}}</li>
</ul>
`
})
new Vue({
el:"#app",
})
</script>
组件--子传父:
<div id="app">
<my-father></my-father>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component('my-father',{
template:`
<div>
<h1>{{mess}}</h1>
<my-child @send='revmsg'></my-child>
</div>
`
,
data:function(){
return{
mess:''
}
},
methods:{
revmsg:function(txt){
this.mess=txt
}
}
})
Vue.component('my-child',{
template:`
<button @click='sendfther'>点击查看</button>
`
,
data:function(){
return{
msg:'还有什么等待，还有什么悲哀！'
}
},
methods:{
sendfther:function(){
//this.$emit('自定义事件'，参数)
this.$emit('send',this.msg)
}
}
})
new Vue({
el:'#app',
})
</script>
父传子--用属性传； 子传父---用事件传 $emit('自定义事件'，参数)
