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  • 87 全局和局部组件, 子父和父子之间的通信 混入 插槽 路飞导航栏

    主要内容:

    1  全局组件:

      a : 定义一个全局组件

       Vue.component(
            'global-component', {
                template: `<div>          注意:  template一定要包一层div
                    <h3>{{wanrong}}</h3>
                    <h2>{{wanrong}}</h2>
                            </div>`,
                data() {
                    return {
                        wanrong: 'hello',
                    }
                }
            }
        );
    

      2  全局组件的使用的两种方式:

        a:  写在实例中:

        new Vue({
            el: '#app',
            //如果写在下面, 则找到tmplate标签, 把它当做跟标签.渲染,
            template:`<global-component></global-component>`
    
        })
    

        b : 写在标签里:

    <div id="app">
        <!--如果写在上面, 则以id为app的div为根标签-->
        <global-component></global-component>
    </div>
    

        两种方式的区别:  如果写在实例中, 直接显示组件中的template, 如果写在div中, 多了一个以id为app的div标签

    2  局部组件的应用:

      a:  先创建一个对象:

      let Header = {
            template:`<h1>{{greeting}}</h1>`,
            data(){
                return{
                    greeting: 'hello'
                }
            }
        };
    

      b : 为了更加的符合规范, 创建了一个app对象, 作为程序入口

        let App = {
            //3使用子组件
          template: `
            <div>
            <app-header"></app-header>
            </div>
          `  ,
            //2在父组件中注册子组件
            components:{
              'app-header': Header
            }
    
        };
    

      c: 实例

       new Vue({
            el:'#app',
            template:  `<App></App>`,
            components:{
                App
            }
        })
    

      流程:先创建两个对象, Header, App, 然后创建一个Vue实例, 注册组件App作为程序的入口, 为了使程序更加的规范 ,

    然后,在实例中使用组件,   接着走到app组件, 在父组件中注册子组件, 使用子组件, 然后找到Header的template渲染.

    3 父子组件之间的通信,

      a  : 父亲传递一个数据给孩子, 孩子接受数据使用props

      b : 实例:

    <div id="app"></div>
    <script>
        //1创建一个obj
        let Header = {
            template:`<div>
                            <h1>{{greeting}}</h1>
                            <h2>{{fData}}</h2>
                       </div>`,
            //在子组件中用props接收父组件传过来的参数
            props:['fData'],
            data(){
                return{
                    greeting: 'hello'
                }}};
        let App = {
            //3使用子组件
          template: `
            <div>
            <app-header v-bind:fData="fatherData"></app-header>
            </div>
          `  ,
            //2在父组件中注册子组件
            components:{
              'app-header': Header
            },
            data(){
              return {
                  fatherData:0
              }}};
        new Vue({
            el:'#app',
            template:  `<App></App>`,
            components:{
                App
            }})
    </script>
    </body>
    

    4 子父之间的通信,

      a : emit触发一个函数的执行, 还可以传参数给父组件, 父组件用于监听, 

      b : 实例:

    <!DOCTYPE html>
    <html lang="zh-CN">
    <head>
        <meta http-equiv="content-Type" charset="UTF-8">
        <meta http-equiv="x-ua-compatible" content="IE=edge">
        <title>Title</title>
        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
        <script src="static/vue.min.js"></script>
    </head>
    <body>
    <div id="app">
    </div>
    <script>
        //1创建一个obj
        let Header = {
            template: `<div>
                            <h1>hello</h1>
                            <button v-on:click="sonClick">点击让字体变大</button>
                       </div>`,
            methods: {
                sonClick: function () {
                    this.$emit('change-Size', 0.1)
                }
            }
        };
    
        let App = {
            //3使用子组件
            template: `
            <div>
            <span :style="{fontSize: postFontsize + 'em '}">春暖花开</span>
            <app-header v-on:change-Size="fatherClick"></app-header>
            </div>
          `,
            //2在父组件中注册子组件
            components: {
                'app-header': Header
            },
            data() {
                return {
                    postFontsize: 1
                }
            },
            methods: {
                fatherClick: function (value) {
                    this.postFontsize += value
                }
            }
        };
        new Vue({
            el: '#app',
            template: `<App></App>`,
            components: {
                App
            }
        })
    </script>
    </body>
    </html>
    View Code

     5 非父子之间的通信:借助中间调度器 $emit, $on

    <!DOCTYPE html>
    <html lang="zh-CN">
    <head>
        <meta http-equiv="content-Type" charset="UTF-8">
        <meta http-equiv="x-ua-compatible" content="IE=edge">
        <title>Title</title>
        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
        <script src="../static/vue.min.js"></script>
    </head>
    <body>
    <div id="app">
    </div>
    <script>
        let hanfei = new Vue();
        let maweihua = {
            template:`<div>
                            <h1>这是马卫华</h1>
                            <button v-on:click="my_click">点我向康神说话</button>
                        </div>`,
            methods:{
                my_click:function () {
                    //向康神说话
                    //向中间调度器提交事件
                    hanfei.$emit("maweihua_say", "一起玩")
                }
            }
        };
        let kanshen = {
            template:`<div><h1>这是康神</h1>{{say}}</div>`,
            data(){
                return {
                    say:''
                }
            },
            mounted(){
                //监听中间调度器的方法
                let that = this;
                hanfei.$on("maweihua_say", function (data) {
                    console.log(data);
                    this.say = data
                })
            }
        };
        const app = new Vue({
            el:'#app',
            components:{
                maweihua: maweihua,
                kanshen: kanshen
            }
        })
    </script>
    </body>
    </html>
    View Code

    6 组件系统之混入:假如两个对象中都用到了一个方法, 可以把这个方法提取出来, 定义一个mixs对在用到的地方: mixins:[mixs]

    <!DOCTYPE html>
    <html lang="zh-CN">
    <head>
        <meta http-equiv="content-Type" charset="UTF-8">
        <meta http-equiv="x-ua-compatible" content="IE=edge">
        <title>Title</title>
        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
        <script src="static/vue.min.js"></script>
    </head>
    <body>
    <div id="app"></div>
    
    
        // <!--第一版, 因为代码重复, 所以引入了混入-->
        let mixs = {
               methods:{
                show: function (name) {
                    console.log(name + 1)
                },
                hide: function (name) {
                    console.log(name + 0)
                }
            }
        };
        let wanrong = {
            template:`<div>
                            <button v-on:click="show('wanrong')">点击显示蓉蓉1</button>
                            <button v-on:click="hide('wanrong')">点击显示蓉蓉0</button>
                        </div>`,
            mixins:[mixs]
        };
        let ningning = {
            template: `<div>
                            <button v-on:click="show('ningning')">点击显示宁宁1</button>
                            <button v-on:click="hide('ningning')">点击显示宁宁0</button>
                        </div>`,
            mixins:[mixs]
        };
        let App = {
            template:`<div>
                            <my-wanrong></my-wanrong>
                            <my-ningning></my-ningning>
                        </div>`,
            components:{
                'my-wanrong': wanrong,
                'my-ningning': ningning
            }
        };
        new Vue({
            el: '#app',
            template:`<div>
                            <App></App>
                        </div>`,
            components:{
                'App': App
            }
    
        })
    </script>
    </body>
    </html>
    View Code

    7组件系统之插槽:  可以放多个标签:  <slot></slot>

        <script src="static/vue.min.js"></script>
        <style>
            .body {
                margin: 0;
            }
            .box {
                 80px;
                height: 50px;
                background-color:paleturquoise;
                float: left;
                line-height: 50px;
    
            }
        </style>
    </head>
    <body>
    <div id="app" >
        <global-component>首页</global-component>
        <global-component>免费课程</global-component>
        <global-component>轻课</global-component>
        <global-component>智能题库</global-component>
        <global-component>学位课程</global-component>
        <global-component>咨询</global-component>
    </div>
    <script>
        //定义一个全局的组件
        //插槽就是可以放多个标签
        Vue.component('global-component', {
            template:`<div class="box"><slot></slot></div>`
        });
        new Vue({
            el: '#app',
        })
    </script>
    View Code

    8 组件系统之具名插槽:  为每个插槽起具体的名字

        <script src="static/vue.min.js"></script>
        <style>
            body {
                margin:0;
            }
            .box {
                80px;
                height:50px;
                background-color: paleturquoise;
                float: left;
                margin-left: 5px;
            }
        </style>
    </head>
    <body>
    <div id="app" >
        <global-component>
            <div slot="home">首页</div>
            <div slot="lightcourse">轻课</div>
            <div slot="degreecourse">学位课程</div>
        </global-component>
    </div>
    <script>
        //定义一个全局的组件
        Vue.component('global-component', {
            template:`<div class="box">
                            <slot name="lightcourse"></slot>
                            <slot name="degreecourse"></slot>
                            <slot name="home"></slot>
                        </div>`
        });
        new Vue({
            el: '#app',
        })
    </script>
    View Code

    9 template格式, 就是把对象中的template单独隔离出来,

    <body>
        <div id="app"></div>
        <template id="header">
            <div>
                <h1>Hello Vue</h1>
            </div>
        </template>
        <script>
            let Header = {
                template: '#header'
            };
            new Vue({
                el: '#app',
                template:`<div><app-header></app-header></div>`,
                components:{
                    'app-header': Header
                }
            })
        </script>
    </body>
    

    10 组件系统之路飞导航栏

    <!DOCTYPE html>
    <html lang="zh-CN">
    <head>
        <meta http-equiv="content-Type" charset="UTF-8">
        <meta http-equiv="x-ua-compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>Title</title>
        <script src="static/vue.min.js"></script>
          <!-- 引入样式 -->
        <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
        <!-- 引入组件库 -->
        <script src="https://unpkg.com/element-ui/lib/index.js"></script>
        <style>
            body {
                margin: 0;
                padding: 0;
            }
            .header {
                position: fixed;
                top:0;
                left:0;
                100%;
            }
              .el-menu {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            .footer {
                position: fixed;
                bottom:0;
                left:0;
                100%;
            }
            .header img {
                position: absolute;
                left: 80px;
                top: -4px;
                118px;
                height: 70px;
                z-index:999
            }
        </style>
    </head>
    <body>
    <div id="app">
    
    </div>
    <!--导航头-->
    <template id="header">
        <div class="header">
            <img src="https://www.luffycity.com/static/img/head-logo.a7cedf3.svg"/>
            <el-menu :default-active="activeIndex" class="el-menu-demo" mode="horizontal"  @select="handleSelect"
      background-color="#545c64" text-color="#fff" active-text-color="#ffd04b">>
                <el-menu-item index="1">首页</el-menu-item>
                <el-menu-item index="2">免费课程</el-menu-item>
                <el-menu-item index="3">轻课</el-menu-item>
                <el-menu-item index="4">学位课程</el-menu-item>
                <el-menu-item index="5">智能题库</el-menu-item>
                <el-menu-item index="6">公开课</el-menu-item>
                <el-menu-item index="7">内部教材</el-menu-item>
                <el-menu-item index="8">老男孩教育</el-menu-item>
            </el-menu>
        </div>
    </template>
    
    
    <!--导航尾部-->
    <template id="footer">
        <div class="footer">
            <el-menu  class="el-menu-demo" mode="horizontal"
      background-color="#545c64" text-color="#fff" active-text-color="#ffd04b">>
                <el-menu-item index="1">关于我们</el-menu-item>
                <el-menu-item index="2">联系我们</el-menu-item>
                <el-menu-item index="3">商业合作</el-menu-item>
                <el-menu-item index="4">帮助中心</el-menu-item>
                <el-menu-item index="5">意见反馈</el-menu-item>
                <el-menu-item index="6">新手指南</el-menu-item>
            </el-menu>
        </div>
    </template>
    <script>
        let Header = {
            template: "#header",
            data() {
                return {
                    activeIndex: 0
                };
            },
            methods: {
                handleSelect(key, keyPath) {
                    console.log(key, keyPath);
                }
            }
        };
    
        let Footer = {
          template:'#footer',
    
        };
    
        new Vue({
            el: "#app",
            template: `<div>
                            <app-header></app-header>
                            <app-footer></app-footer>
                        </div>
    `,
            components: {
                "app-header": Header,
                'app-footer': Footer
            }
        })
    </script>
    
    </body>
    </html>
    View Code
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  • 原文地址:https://www.cnblogs.com/gyh412724/p/9931926.html
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