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Vue基础实例二(组件)

Vue基础实例二(组件)

作者: IT飞牛 | 来源:发表于2019-03-31 21:55 被阅读0次

    本人生活在一个3线小城市,本地的企业在考虑mvvm框架的时候,几乎都选择了Vue,灵活生态齐全学习成本低配套文档和相关教程丰富等等一系列的优势,使得Vue这个框架在国内异常火爆。而且最近出了uni-app,号称一套代码可以编译出多套代码,大大的减轻开发工作量。所以,我也随大流,踏入Vue。

    本系列实例都是简单的Vue功能演示,纯属个人学习记录用,大神请绕行。

    注意:
    1、子组建模板中必须带有合法的根标签,不能直接写字符串
    2、调用组建时的原生js事件,会被转变成自组建的自定义事件。例如@click,就需要在自组建的methods中自定一个click

    实例效果:

    Vue基础实例二(组件).gif

    代码:

    代码中分别定义了全局组件局部组件
    全局组件:可以用在其被注册之后的任何 (通过 new Vue) 新创建的 Vue 根实例,也包括其组件树中的所有子组件的模板中。
    深入了解请点击:组件注册

    1、定义组件名时如果使用驼峰命名,则使用组件时需要将大写字母拆封成-分割字符串,例如:TudoList,则使用时需要<tudo-item :item="item" :index="index" @delitem="deleteItem($event)"></tudo-item>

    <!DOCTYPE html>
    <html>
    
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Hello world</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
        <style>
            .style1 {
                line-height: 150%
            }
        </style>
    </head>
    
    <body>
        <div id="app" class="style1">
            <ul v-for="(item,index) in lists">
                <tudo-item :item="item" :index="index" @delitem="deleteItem"></tudo-item>
                <!--等效于@delitem="deleteItem($event)"-->
            </ul>
            <input type="text" v-model="keyword">
            <button @click="addItem">添加</button>
        </div>
    </body>
    
    </html>
    
    <script>
        // Vue.component("tudo-item", {
        //     props: ["item", "index"],
        //     template: '<li>{{item.id}}-{{item.name}} <font color="red" size="0" style=" cursor:pointer" @click="function(){deleteItem(index)}">X</font></li>',
        //     methods: {
        //         deleteItem: function (i) {
        //             this.$emit("delitem", i);
        //         }
        //     }
        // })
    
        var TudoItem = {
            props: ["item", "index"],
            template: '<li>{{item.id}}-{{item.name}} <font color="red" size="0" style=" cursor:pointer" @click="function(){deleteItem(index)}">X</font></li>',
            methods: {
                deleteItem: function (i) {
                    this.$emit("delitem", i);
                }
            }
        };
    
        var app = new Vue({
            el: "#app",
            components: {
                "tudo-item": TudoItem
            },
            data: {
                keyword: "",
                lists: [
                    { id: 1, name: "这是第一个" },
                    { id: 2, name: "这是第二个" },
                    { id: 3, name: "这是第三个" },
                    { id: 4, name: "这是第四个" },
                    { id: 5, name: "这是第五个" }
                ]
            },
            methods: {
                addItem: function (event) {
                    this.lists.push({ id: this.lists.length + 1, name: this.keyword });
                    this.keyword = "";
                },
                deleteItem: function (index) {
                    this.lists.splice(index, 1);
                }
            }
        })
    
    </script>
    

    非父子组件传值:

    假如有组件aaabbb,希望点击aaa中按钮,bbb能收到aaa中点击事件并接受传值。
    其实就是在Vue原型链上添加一个bus属性,属性值是个Vue实例。那么在Vue实例中就可以使用bus的this.bus.$emit("事件名",值)this.bus.$on("事件名",function(msg){...表达式...}),进行广播事件和监听事件。

    <!DOCTYPE html>
    <html>
    
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Hello world</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
        <style>
            .style1 {
                line-height: 150%
            }
        </style>
    </head>
    
    <body>
        <div id="app" class="style1">
            <aaa></aaa>
            <bbb></bbb>
        </div>
    </body>
    
    </html>
    <script>
        Vue.prototype.bus = new Vue();
    
        var aaa = {
            template: '<button @click="clickA">点击组件aaa</button>',
            methods: {
                clickA: function () {
                    this.bus.$emit("clickA", "组件A中点击事件传值");
                }
            }
        };
        var bbb = {
            template: '<span>{{content}}</span>',
            data: function () {
                return {
                    content: ""
                }
            },
            mounted: function () {
                this.bus.$on("clickA", (msg) => {
                    this.content = msg;
                })
            },
        };
        var app = new Vue({
            el: "#app",
            components: {
                "aaa": aaa,
                "bbb": bbb
            }
        })
    </script>
    

    slot父子组件传值

    <!DOCTYPE html>
    <html>
    
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Hello world</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
        <style>
            .style1 {
                line-height: 150%
            }
        </style>
    </head>
    
    <body>
        <div id="app" class="style1">
            <aaa>
                <div slot="header">header</div>
                <div slot="footer">footer</div>
            </aaa>
        </div>
    </body>
    
    </html>
    <script>
        var aaa = {
            template:
                `<div>
                    <slot name="header"></slot>
                    <slot name="footer"></slot>
                </div>`,
        };
        var app = new Vue({
            el: "#app",
            components: {
                "aaa": aaa
            }
        })
    </script>
    

    动态组件:

    <child-one v-if='type=="child-one"'></child-one>
    <child-two v-if='type=="child-two"'></child-two>
    

    等同于:

    <component :is="type"></component>//根据is后面跟着的组件名,动态调用组件来显示
    

    完整代码:

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Hello world</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
        <style>
            .style1 {
                line-height: 150%
            }
        </style>
    </head>
    <body>
        <div id="app" class="style1">
            <child-one v-if='type=="child-one"'></child-one>
            <child-two v-if='type=="child-two"'></child-two>
            <!--<component :is="type"></component>-->
            <button @click="toggle">点击</button>
        </div>
    </body>
    </html>
    <script>
        var childone = {
            template: `<div>child-one</div>`,
        };
        var childtwo = {
            template: `<div>child-two</div>`,
        };
        var app = new Vue({
            el: "#app",
            components: {
                "child-one": childone,
                "child-two": childtwo,
            },
            data: {
                type: "child-one"
            },
            methods: {
                toggle: function () {
                    this.type = this.type == "child-one" ? "child-two" : "child-one";
                }
            }
        })
    </script>
    

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