封装toast组件挂载到插件上，仿vux的插件调用toast

<template>
  <div class="vux-toast">
    <div class="weui-mask_transparent" v-show="isShowMask && show"></div>
    <transition :name="currentTransition">
      <div class="weui-toast" :style="{ width}" :class="toastClass" v-show="show">
        <i class="weui-icon-success-no-circle weui-icon_toast" v-show="type !== 'text'"></i>
        <p class="weui-toast__content" v-if="text" :style="style"  v-html="text" ></p>
        <p class="weui-toast__content" v-else :style="style">
          <slot></slot>
        </p>
      </div>
    </transition>
  </div>
</template>

<script>
export default {
  name: 'toast',
  props: {
    value: Boolean,
    time: {
      type: Number,
      default: 2000
    },
    type: {
      type: String,
      default: 'success'
    },
    transition: String,
     {
      type: String,
      default: '7.6em'
    },
    isShowMask: {
      type: Boolean,
      default: false
    },
    text: String,
    position: String
  },
  data () {
    return {
      show: false
    }
  },
  created () {
      console.log(this.text,"text")
    if (this.value) {
      this.show = true
    }
  },
  computed: {
    currentTransition () {
      if (this.transition) {
        return this.transition
      }
      if (this.position === 'top') {
        return 'vux-slide-from-top'
      }
      if (this.position === 'bottom') {
        return 'vux-slide-from-bottom'
      }
      return 'vux-fade'
    },
    toastClass () {
      return {
        'weui-toast_forbidden': this.type === 'warn',
        'weui-toast_cancel': this.type === 'cancel',
        'weui-toast_success': this.type === 'success',
        'weui-toast_text': this.type === 'text',
        'vux-toast-top': this.position === 'top',
        'vux-toast-bottom': this.position === 'bottom',
        'vux-toast-middle': this.position === 'middle'
      }
    },
    style () {
      if (this.type === 'text' && this.width === 'auto') {
        return { padding: '10px' }
      }
    }
  },
  watch: {
    show (val) {
      if (val) {
        this.$emit('input', true)
        this.$emit('on-show')
        clearTimeout(this.timeout)
        this.timeout = setTimeout(() => {
          this.show = false
          this.$emit('input', false)
          this.$emit('on-hide')
        }, this.time)
      }
    },
    value (val) {
      this.show = val
    }
  }
}
</script>

import ToastComponent from "@/components/Toast"
import { mergeOptions } from './plugin_helper'
import objectAssign from 'object-assign'
let $vm
let watcher

const plugin = {
  install (vue, pluginOptions = {}) {
    const Toast = vue.extend(ToastComponent)
    if (!$vm) {
      $vm = new Toast({
        el: document.createElement('div')
      })
      document.body.appendChild($vm.$el)
    }
    console.log($vm.$options.props,"$vm.$options.props")
    const defaults = {}
    for (let i in $vm.$options.props) {
      if (i !== 'value') {
        defaults[i] = $vm.$options.props[i].default
      }
    }
    console.log(defaults,"defaults")
    const toast = {
      show (options = {}) {
        // destroy watcher
        watcher && watcher()
        console.log(options,"options")
        console.log(typeof options,"options")
        if (typeof options === 'string') {
          mergeOptions($vm, objectAssign({}, pluginOptions, {text: options}))
        } else if (typeof options === 'object') {
            console.log(123)
          mergeOptions($vm, objectAssign({}, pluginOptions, options))
        }
        if (typeof options === 'object' && options.onShow || options.onHide) {
            console.log(456)
          watcher = $vm.$watch('show', (val) => {
            val && options.onShow && options.onShow($vm)
            val === false && options.onHide && options.onHide($vm)
          })
        }
        $vm.show = true
      },
      text (text, position = 'default') {
        this.show({
          type: 'text',
           'auto',
          position,
          text
        })
      },
      hide () {
        $vm.show = false
      },
      isVisible () {
        return $vm.show
      }
    }
    vue.prototype.$alert = toast
  }
}

export default plugin
export const install = plugin.install

<!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">
    <script src="./vue.js"></script>
    <title>Document</title>
</head>
<style>

</style>
<body>
    <div id="app">
            <base-component></base-component>
            <base-component1></base-component1>
            <base-component2></base-component2>
            <hr>
    </div>
    <div id="app1">
    </div>
    <script>
        let baseOptions =
         { template: `<p> {{ firstName }} {{ lastName }} aka {{ alias }}</p>`, 
            data () {
                return { firstName: '大漠', lastName: 'w3cplus', alias: '大漠_w3cplus' } 
                } 
            }
            
            let baseExtend = Vue.extend(baseOptions)
            let newbaseExtend =new baseExtend({
                el:"#app1"
            });
            

// 等同于下面， 区别是 动态添加到body里，而不是固定的dom节点

let newbaseExtend =new baseExtend({

el:document.createElement("div")

});

document.body.appendChild(newbaseExtend.$el)

            Vue.component('base-component',baseOptions)
            Vue.component('base-component1',baseExtend)
            Vue.component('base-component2',Vue.extend(baseOptions))
            /**
            *Vue.component()会注册一个全局的组件，
            其会自动判断第二个传进来的是Vue继续对象（Vue.extend）还是普通对象({...})，
            如果传进来的是普能对象的话会自动调用Vue.extend，
            所以你先继承再传，还是直接传普通对象对Vue.component()的最终结果是没差的。著作权归作者所有。
            */
            var vm = new Vue({
                el:"#app"
            })
            // console.log(baseExtend,"baseExtend") 
            // console.log(Vue,"vue")
            console.log(vm,"vm")
            /**
            *ƒ VueComponent(options) {
                    this._init(options);
                } "baseExtend"
                
            ƒ Vue(options) {
                if (!(this instanceof Vue)
                ) {
                    warn('Vue is a constructor and should be called with the `new` keyword');
                }
                this._init(options);
                } "vue"
            */
            /*
            *   Vue.extend()和Vue.component()的区别
            https://www.w3cplus.com/vue/vue-extend.html
            */
    </script>
</body>
</html>

  *   Vue.extend()和Vue.component()的区别
            https://www.w3cplus.com/vue/vue-extend.html
            */