Vue 小实例 - 组件化、cli 工程化

妖狐艹你老母 2021-11-01 06:34 344阅读 0赞

1. 组件化 （父子组件通信： 父 - 子 ：props 数组 子 - 父 ： 子层触发事件，调用 $emit 触发父层对应自定义事件，可函数处理传参 / $event 获取）

html

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Vue.component('todo-list',{
        props:['content','index'],
        template:'<li @click="removeCall">{
         {content}}</li>',
        methods:{
            removeCall:function(){
                this.$emit('del',this.index)
            }
        }
    })
    
    // var TodoList={
          
    //     props:['content','index'],
    //     template:'<li @click="removeCall">{
          {content}}</li>',
    //     methods:{
          
    //         removeCall:function(){
          
    //             this.$emit('del',this.index)
    //         }
    //     }
    // }
    
    var app=new Vue({
        el:'#app',
        // components:{
          
        //     'todo-list':TodoList
        // },
        data:{
            items:['wj','xiaoxiao','six'],
            inputVal:''
        },
        methods:{
            addEle:function(){
                this.items.push(this.inputVal);
                this.inputVal='';
            },
            removeHandle:function(index){
                this.items.splice(index,1)
            }
        }
    })

[其他挂载方法][Link 1]

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new Vue({
    
      router,
      store,
      //components: { App }  vue1.0的写法
      render: h => h(App)    vue2.0的写法
    }).$mount('#app')

1.1 官网实例写法 （父子组件通信）

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<!DOCTYPE html>
    <html lang="en">
    
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>Document</title>
        <script src="https://cdn.jsdelivr.net/npm/vue"></script>
    </head>
    
    <body>
        <ol id="app">
            <div :style="{ fontSize: postFontSize + 'em' }">
                <blog-post v-for="(post,index) in posts"
                v-on:enlarge-text="postFontSize += $event"
                v-bind:key="post.id" v-bind:post="post" :index="index"
                    @del="removeHadle">
                </blog-post>
            </div>
        </ol>
    
        <script>
            Vue.component('blog-post', {
                props: ['post', 'index'],
                template: `
        <div class="blog-post">
          <h3 @click="remove(index)">{
          { post.title }}</h3>
          <div v-html="post.content"></div>
          <button v-on:click="$emit('enlarge-text',0.5)">
      Enlarge text
    </button>
        </div>`,
                methods: {
                    remove: function (index) {
                        this.$emit('del', index)
                    }
                }
    
            })
            var app = new Vue({
                el: '#app',
                data: {
                    posts: [{
                            id: 1,
                            title: 'My journey with Vue'
                        },
                        {
                            id: 2,
                            title: 'Blogging with Vue'
                        },
                        {
                            id: 3,
                            title: 'Why Vue is so fun'
                        }
                    ],
                    postFontSize: 1
                },
                methods: {
                    removeHadle: function (index) {
                        this.posts.splice(index, 1)
                    }
    
    
                }
            })
        </script>
    
    
    </body>
    
    </html>

1.2 自定义双向绑定组件写法

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1.3 兄弟组件通信 ： 由于 Vue 实例实现了一个事件分发接口，可以通过实例化一个空的 Vue 实例，组件中使用 `$emit`, `$on`, `$off` 分别来分发、监听、取消监听事件。

类似 jq trigger 的自定义事件及其触发使用方式

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<!DOCTYPE html>
    <html lang="en">
    
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>Document</title>
        <script src="https://cdn.jsdelivr.net/npm/vue"></script>
    </head>
    
    <body>
        <div id="app">
            <p style="margin-bottom:50px;">{
         {msg}}</p>
            <post-wrap></post-wrap>
            <get-wrap></get-wrap>
        </div>
    
        <script>
            var bus = new Vue();
            Vue.component("post-wrap", {
                template: `
                    <div>
                        <h1>post-wrap</h1>
                        <input type="text" v-model="postMes"/>
                        <button @click="eventPost">post</button>
                    </div>
                `,
                data: function () {
                    return {
                        postMes: ""
                    }
                },
                methods: {
                    eventPost: function () {
                        bus.$emit("eventGet", this.postMes);
                        this.postMes = "";
                    }
                }
    
            })  
            Vue.component("get-wrap", {
                template: `
                    <div>
                        <h1>get-wrap</h1>
                        <p v-for="item in items">{
          {item}}</p>
                    </div>
                `,
                data: function () {
                    return {
                        items: []
                    }
                },
                mounted: function () {
                    bus.$on("eventGet", (item) => {
                        this.items.push(item);
                    })
                }
            })
            new Vue({
                el: "#app",
                data: {
                    msg: "Hello"
                }
            })
        </script>
    
    </body>
    
    </html>

1.3.1 兄弟组件通信（更合理的写法 ： 销毁时清除对应事件）

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<!DOCTYPE html>
    <html lang="en">
    
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>Document</title>
        <script src="https://cdn.jsdelivr.net/npm/vue"></script>
    </head>
    
    <body>
        <div id="app">
            <p style="margin-bottom:50px;">{
         {msg}}</p>
            <post-wrap></post-wrap>
            <get-wrap></get-wrap>
        </div>
    
        <script>
            var bus = new Vue();
            var postWrap={
                template: `
                    <div>
                        <h1>post-wrap</h1>
                        <input type="text" v-model="postMes"/>
                        <button @click="eventPost">post</button>
                    </div>
                `,
                data: function () {
                    return {
                        postMes: ""
                    }
                },
                methods: {
                    eventPost: function () {
                        bus.$emit("eventGet", this.postMes);
                        this.postMes = "";
                    }
                }
    
            };
            var getWrap= {
                template: `
                    <div>
                        <h1>get-wrap</h1>
                        <p v-for="item in items">{
          {item}}</p>
                    </div>
                `,
                data: function () {
                    return {
                        items: []
                    }
                },
                mounted: function () {
                    bus.$on("eventGet", this.eventMyGet)
                },
                beforeDestroy: function () {
                    bus.$off('eventGet', this.eventMyGet)         
                },
                methods: {
                    eventMyGet: function (item) {
                        this.items.push(item);
                    }
                }
            };
            
            Vue.component("post-wrap",postWrap )
            Vue.component("get-wrap",getWrap)
    
            new Vue({
                el: "#app",
                data: {
                    msg: "Hello"
                }
            })
        </script>
    
    </body>
    
    </html>

2. cli 工程化

2.1 vue-cli 环境搭建

安装完 node 后，

npm install --global vue-cli  
vue init webpack my-project  
cd my-project  
npm run dev

2.2 代码编辑 （ src 目录下修改 ）

文件名称修改 APP - TodoList HelloWord - TodoItem

main

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// The Vue build version to load with the `import` command
    // (runtime-only or standalone) has been set in webpack.base.conf with an alias.
    import Vue from 'vue'
    import TodoList from './TodoList'
    
    Vue.config.productionTip = false
    
    /* eslint-disable no-new */
    // 模板渲染内容：template > html
    new Vue({
      el: '#app',
      components: { TodoList },
      template: '<TodoList />'
    })

TodoList

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<template>
      <div id="app">
        <input v-model="inputVal">
        <button @click="addEle">add</button>
        <ul>
          <todo-list
            v-for="(item,index) in items"
            :key="index"
            :content="item"
            :index="index"
            @del="removeHandle"
          ></todo-list>
        </ul>
      </div>
    </template>
    
    <script>
    import TodoList from "./components/TodoItem";
    
    export default {
      name: "App",
      // template:'<div id="app"> ... </div>',
      components: {
        "todo-list": TodoList
      },
      data() {
        // () 、 return 、 {}、 msg  前后空格
        return {
          items: ["wj", "xiaoxiao", "six"],
          inputVal: ""
        };
      },
      methods: {
        addEle: function() {
          if (this.inputVal === "") {
            return;
          }
          this.items.push(this.inputVal);
          this.inputVal = "";
        },
        removeHandle: function(index) {
          this.items.splice(index, 1);
        }
      }
    };
    </script>
    
    <style>
    #app {
          
      font-size: 36px;
    }
    </style>

TodoItem

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<template>
      <li @click="removeCall">{
         {content}}</li>
    </template>
    
    <script>
    export default {
      name: "todo-list",
      props: ["content", "index"],
      methods: {
        removeCall: function() {
          this.$emit("del", this.index);
        }
      }
    };
    </script>
    
    
    <style scoped>
    * {
          
      color: #42b983;
    }
    </style>

3.扩展

[vue项目，webpack中配置src路径别名及使用 ][vue_webpack_src_]

[Vue中使用 transition标签或transition-group标签][Vue_ transition_transition-group]

[Vue不能热更新的原因 ][Vue_]

转载于:https://www.cnblogs.com/justSmile2/p/10966358.html

[ContractedBlock.gif]: https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif
[ExpandedBlockStart.gif]: /images/20211101/4e508d8a4c2648de8977e1e5856cbfca.png
[Link 1]: https://www.cnblogs.com/whkl-m/p/6970859.html
[vue_webpack_src_]: https://www.cnblogs.com/hsl-shiliang/p/10333022.html
[Vue_ transition_transition-group]: https://blog.csdn.net/weixin_42218847/article/details/81474923
[Vue_]: https://www.jianshu.com/p/23d705829d3b