Vueextend学习示例讲解

<div id="mount-point"></div>
// 创建构造器

var Profile = Vue.extend({
  template: '<p>{{firstName}} {{lastName}} aka {{alias}}</p>',
  data: function () {
    return {
      firstName: 'Walter',
      lastName: 'White',
      alias: 'Heisenberg'
    }
  }
})
// 创建 Profile 实例，并挂载到一个元素上。
new Profile().$mount('#mount-point')
// 结果如下：
<p>Walter White aka Heisenberg</p>

<!--动态组件的模板-->
<template>
  <!--  可以用MessageBox做蒙尘-->
  <div :class="['MessageBox',type]">
    <div class="inner">
      <header class="header">
        <h1 class="title">{{ title }}</h1>
        <span @click="$messageBox.hide()">x</span>
      </header>
      <div class="content">{{ content }}</div>
    </div>
  </div>
</template>
<script>
export default {
  name: "MessageBox",
  props: {
    title: {
      type: String,
      default: "this is title",
    },
    content: {
      type: String,
      default: "this is content",
    },
    type: {
      type: String,
      default: "primary",
      //检测传进来的类型是否是这四种，通过es6提供的includes方法模糊查询
      validator(value) {
        return [
          "primary",
          "success",
          "warn",
          "danger"
        ].includes(value);
      }
    }
  }
}
</script>
<style scoped lang="less">
.MessageBox {
  position: fixed;
  left: 50%;
  top: 0;
  //蒙尘的大小设置
  width: 50%;
  height: 400px;
  background-color: rgba(0, 0, 0, .5);
  //不同弹窗的样式
  &.primary {
    .header {
      background-color: blue;
      color: #fff;
    }
  }
  &.success {
    .header {
      background-color: green;
      color: #fff;
    }
  }
  &.warn {
    .header {
      background-color: rgba(255, 138, 71, 0.96);
      color: #fff;
    }
  }
  &.danger {
    .header {
      background-color: red;
      color: #fff;
    }
  }
  .inner {
    position: absolute;
    top: 100px;
    left: 50%;
    width: 500px;
    margin-left: -250px;
    background-color: #fff;
    box-shadow: 1px 3px 5px #DDD;
    border-radius: 5px;
    overflow: hidden;
    .header {
      height: 44px;
      padding: 0 10px;
      line-height: 44px;
      box-sizing: border-box;
      h1 {
        margin: 0;
        font-weight: nORMal;
      }
      .title {
        font-size: 16px;
        float: left;
      }
      span {
        //将鼠标改为小手样式
        cursor: pointer;
        float: right;
      }
    }
    .content {
      padding: 20px;
      box-sizing: border-box;
    }
  }
}
</style>

//引入需要动态创建的模板
import _MessageBox from "@/components/messageBox/MessageBox";
export default {
    //install开发插件的方法，install带有Vue的构造器，可以使用Vue.extend，和Vue.component(注册组件)
    //在Vue.use的时候就会调用这个install
    install(Vue) {
        let messageBox = null;
        //使用Vue.component全局注册组件
        Vue.component(_MessageBox.name, _MessageBox);
        //将方法添加到Vue的prototype属性中，这样实例就可以继承里面的方法
        Vue.prototype.$messageBox = {
            show, hide,
            info({title, content, type}, callback) {
                this.show({title, content, type: "primary"}, callback)
            },
            success({title, content, type}, callback) {
                this.show({title, content, type: "success"}, callback)
            },
            warn({title, content, type}, callback) {
                this.show({title, content, type: "warn"}, callback)
            },
            danger({title, content, type}, callback) {
                this.show({title, content, type: "danger"}, callback)
            }
        }
        //显示弹窗
        function show(props, callback) {
            //判断这个组件是否存在，如果不存在
            if (!messageBox) {
                //生成构造函数、构造器
                const MessageBox = Vue.extend({
                    
                    //此处传入的是一个函数组件，所以渲染的函数还可以额外接收一个参数
                    render(h) {
                        //h函数就是vue中的createElement函数，这个函数作用就是创建虚拟dom，追踪dom变化的
                        return h("MessageBox", {
                            //用于接收传递的参数
                            props: {...props}
                        })
                    }
                });
                //将动态模板组件实例化
                messageBox = new MessageBox();
                //将这个实例手动挂载，挂载后可以通过$el获取这个元素
                this.vm = messageBox.$mount();
                //将组件添加到body上，脱离了根节点，不在"id=app中"
                document.body.appendChild(this.vm.$el)
                callback && callback();
            }
        }
        //关闭弹窗
        function hide(callback) {
            //移出这个组件
            document.body.removeChild(this.vm.$el);
            //将这个实例销毁
            messageBox.$destroy();
            messageBox = null;
            this.vm = null;
            //如果存在才会执行
            callback && callback();
        }
    }
}

import Vue from 'vue'
import App from './App.vue'
//1、引入
import MessageBox from "@/components/messageBox";
//2、全局注册使用
Vue.use(MessageBox);
new Vue({
    render: h => h(App)
}).$mount('#app')

<template>
  <div>
    <button @click="showMessageBox">show</button>
    <button @click="showInfoMessageBox">info</button>
    <button @click="showSucceSSMessageBox">success</button>
    <button @click="showWarnMessageBox">warn</button>
    <button @click="showDangerMessageBox">danger</button>
  </div>
</template>
<script>
export default {
  name: "Extend",
  methods: {
    //通过this.$messageBox可以访问到Vue实例的属性和方法
    showMessageBox() {
      this.$messageBox.success({
        title: 'App',
        content: 'this is content of extend study',
        type: 'success'
      }, () => {
        console.log('show over')
      })
    },
    showInfoMessageBox() {
      this.$messageBox.info({
        title: 'App',
        content: 'this is content of extend study',
      }, () => {
        console.log('info over')
      })
    },
    showSuccessMessageBox() {
      this.$messageBox.success({
        title: 'App',
        content: 'this is content of extend study',
        type: 'success'
      }, () => {
        console.log('success over')
      })
    },
    showWarnMessageBox() {
      this.$messageBox.warn({
        title: 'App',
        content: 'this is content of extend study',
        type: 'warn'
      }, () => {
        console.log('warn over')
      })
    },
    showDangerMessageBox() {
      this.$messageBox.danger({
        title: 'App',
        content: 'this is content of extend study',
        type: 'danger'
      })
    }
  }
}
</script>