1、什么是組件识椰？
組件（component）是Vue最強大的功能之一绝葡，組件化開發(fā)，組件可以擴展HTML元素腹鹉，封裝可重用的代碼藏畅。組件分為全局組件和局部組件。
2种蘸、全局組件
全局組件的書寫格式：
Vue.component("組件名"墓赴，{
template:`
<模板>
`
})
例：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<div id="app">
<my-component></my-component>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component("my-component",{
template:`
<ul>
<li>蘋果</li>
<li>橘子</li>
<li>香蕉</li>
<li>柚子</li>
<li>葡萄</li>
</ul>
`
}),
new Vue({
el:"#app"
})
</script>
</body>
</html>
3、局部組件
局部組件的書寫格式：
component("組件名"航瞭，{
template:`
<模板>
`
})
例:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<div id="app">
<my-component></my-component>
</div>
<script src="js/vue.js"></script>
<script>
new Vue({
el:"#app",
components:{
"my-component":{
template:`
<ul>
<li>蘋果</li>
<li>橘子</li>
<li>香蕉</li>
<li>柚子</li>
<li>葡萄</li>
</ul>
`
}
}
})
</script>
</body>
</html>
4诫硕、prop
prop 是父組件用來傳遞數(shù)據(jù)的一個自定義屬性,父組件的數(shù)據(jù)需要通過 props 把數(shù)據(jù)傳給子組件。
例:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="app">
<my-content></my-content>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component("my-content",{
template:`
<div>
<h2>我是my-content組件的標題</h2>
<my-child v-bind:message="msg"></my-child>
</div>
`,
data:function(){
return{
msg:"jkdsjoisajdi"
}
}
})
Vue.component("my-child",{
props:["message"],
template:`
<div>
<h3>我是my-child組件中的標題</h3>
<p>{{message}}</p>
</div>
`
})
new Vue({
el:"#app"
})
</script>
</body>
</html>
5刊侯、傳值
組件之間的傳值分為：父級傳子級（用屬性傳值）章办、子級傳父級（用事件傳值）、同級之間傳值滨彻。
父級傳子級例1:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="app">
<my-content></my-content>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component("my-content",{
template:`
<div>
<h2>我是my-content組件的標題</h2>
<my-child v-bind:message="msg"></my-child>
</div>
`,
data:function(){
return{
msg:"hello Vue"
}
}
})
Vue.component("my-child",{
props:["message"],
template:`
<div>
<h3>我是my-child組件中的標題</h3>
<p>{{message}}</p>
</div>
`
})
new Vue({
el:"#app"
})
</script>
</body>
</html>
例2:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<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:["蘋果","橙子","香蕉","香梨"],
title:"水果列表"
}
}
})
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>
</body>
</html>
子級傳父級例1:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<div class="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="sendFather">給父組件</button>
`,
data:function(){
return{
msg:"? ?? ??? ??? ????? ??? ??? ?? ?? ??."
}
},
methods:{
sendFather:function(){
this.$emit("send",this.msg)
}
}
})
new Vue({
el:".app"
})
</script>
</body>
</html>
例2:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div class="app">
<my-father></my-father>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component("my-father",{
template:`
<div>
<h1>這是父組件</h1>
<p>子組件傳來的數(shù)據(jù)為:{{mess}}</p>
<my-child @send="revMsg"></my-child>
</div>
`,
data:function(){
return{
mess:""
}
},
methods:{
revMsg:function(txt){
this.mess=txt
}
}
})
Vue.component("my-child",{
template:`
<div>
<h1>這是子組件</h1>
<input type="mess" v-model="msg">
<button @click="sendFather">向父組件傳遞參數(shù)</button>
</div>
`,
data:function(){
return{
msg:""
}
},
methods:{
sendFather:function(){
this.$emit("send",this.msg)
}
}
})
new Vue({
el:".app"
})
</script>
</body>
</html>
練習1
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<div class="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:["蘋果","香蕉","梨"]
}
},
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="del(index)">刪除 </button></li>
</ul>
`,
methods:{
del:function(ind){
this.fruit.splice(ind,1)
}
}
})
new Vue({
el:".app"
})
</script>
</body>
</html>
練習2
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" href="css/bootstrap.css" />
</head>
<body>
<div class="app">
<my-father></my-father>
</div>
<script src="js/vue.js"></script>
<script>
Vue.component("my-father",{
template:`
<div>
<table class="table table-bordered text-center">
<thead>
<tr>
<th class="text-center">編號</th>
<th class="text-center">名稱</th>
<th class="text-center">單價</th>
<th class="text-center">數(shù)量</th>
<th class="text-center">小計</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:"orange",price:4,count:4,sub:16},
{name:"pear",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>合計:￥{{sum}}</td>
</tr>
</tbody>
`,
data:function(){
return{
sum:0
}
},
methods:{
add:function(ind){
this.list[ind].count++ ;
//計算小計
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--
}
//計算小計
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>
</body>
</html>
