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Vue 小实例

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

<!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="js/vue.js"></script>
</head>
<body>
    <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>
            <!-- <li v-for="item in items">{{item}}</li> -->
        </ul>
    </div>
    <script src="js/js.js"></script>

</body>
</html>

View Code

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)
        }
    }
})

View Code

其他挂载方法

new Vue({

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

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1.1 官网实例写法（父子组件通信）

<!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>

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1.2 自定义双向绑定组件写法

<!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">
        <!-- <input v-model="searchText"> -->
        <!-- <input v-bind:value="searchText" v-on:input="searchText = $event.target.value"> -->
        <!-- <custom-input v-bind:value="searchText" v-on:input="searchText = $event"></custom-input> -->
        <custom-input v-model="searchText"></custom-input>
    </ol>

    <script>
        Vue.component('custom-input', {
            props: ['value'],
            template: `
    <input
      v-bind:value="value"
      v-on:input="$emit('input', $event.target.value)"
    >
  `
        })
        var app = new Vue({
            el: '#app',
            data: {
                searchText: 'hello'
            }
        })
    </script>


</body>

</html>

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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

<!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>

View Code

1.3.1 兄弟组件通信（更合理的写法：销毁时清除对应事件）

<!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>

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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

// 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 />'
})

View Code

TodoList

<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>

View Code

TodoItem

<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>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
* {
  color: #42b983;
}
</style>

View Code

3.扩展

vue项目，webpack中配置src路径别名及使用

Vue中使用 transition标签或transition-group标签

Vue不能热更新的原因

查看全文

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原文地址：https://www.cnblogs.com/justSmile2/p/10966358.html