VUE學習二十，元件初步component
阿新 • • 發佈：2021-07-09
一、先看下面的程式碼
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script> </head> <body> <div id="app"> <button-counter title="title1 : " @clicknow="clicknow"> <h2>hi...h2</h2> </button-counter> <button-counter title="title2 : "></button-counter> </div> <script type="text/javascript"> Vue.component('button-counter', { props: ['title'], data: function () { return { count: 0 } }, template:'<div><h1>hi...</h1><button v-on:click="clickfun">{{title}} You clicked me {{ count }} times.</button><slot></slot></div>', methods:{ clickfun : function () { this.count ++; this.$emit('clicknow', this.count); } } })var vm = new Vue({ el : "#app", data : { }, methods:{ clicknow : function (e) { console.log(e); } } }); </script> <style type="text/css"> </style> </body> </html>
二、講解
1. 元件註冊
// 定義一個名為 button-counter 的新元件 Vue.component('button-counter', { data: function () { return { count: 0 } }, template: '<button v-on:click="count++">You clicked me {{ count }} times.</button>' })
2. 元件引用
<div id="components-demo"> <button-counter></button-counter> </div>
new Vue({ el: '#components-demo' })
3. 元件複用
<div id="components-demo"> <button-counter></button-counter> <button-counter></button-counter> <button-counter></button-counter> </div>
4 .data 必須是一個函式
data: function () { return { count: 0 } }
這樣，每個例項可以維護一份被返回物件的獨立的拷貝。
5 .通過 prop 向子元件傳遞資料
Vue.component('blog-post', {
props: ['title'],
template: '<h3>{{ title }}</h3>'
})
<button-counter title="title2 : "></button-counter>
6.每個元件必須只有一個根元素
<div class="blog-post"> <h3>{{ title }}</h3> <div v-html="content"></div> </div>
7. 增加單擊事件
<button-counter title="title1 : " @clicknow="clicknow">
methods:{ clickfun : function () { this.count ++; this.$emit('clicknow', this.count); } }
8. 增加插槽slot
template: '<div><h1>hi...</h1><button v-on:click="clickfun">{{title}} You clicked me {{ count }} times.</button><slot></slot></div>',
<button-counter title="title1 : " @clicknow="clicknow"> <h2>hi...h2</h2> </button-counter>
本文參考：
https://cn.vuejs.org/v2/guide/components.html