如何寫一個全局的 Notice 組件？

下面將會實現這樣的效果：

1. 創建Notice組件模板：

   組件模板

   <template>
     <transition
       enter-active-class="animate__animated animate__slideInRight"
       leave-active-class="animate__animated animate__slideOutRight"
       @after-leave="afterLeave"
     >
       <div v-if="isShow" class="notice__root">
         <div :class="`notice-type-${type}`" class="noticer">
           {{
             type === "error"
               ? "&#127827;"
               : type === "success"
               ? "&#127808;"
               : type === "warn"
               ? "&#127819;"
               : "&#128051;"
           }}
           : {{ message }}
         </div>
       </div>
     </transition>
   </template>
   <script>
   export default {
     props: {
       title: {
         type: String,
         default: "",
       },
       message: {
         type: String,
         default: "",
       },
       time: {
         type: Number,
         default: 1000,
       },
       type: {
         type: String,
       },
     },
     data() {
       return {
         isShow: false,
       };
     },
     methods: {
       show() {
         this.isShow = true;
         setTimeout(this.hide, this.time);
       },
       hide() {
         this.isShow = false;
       },
       afterLeave() {
         this.remove();
       },
     },
   };
   </script>
   <style lang="less" scoped>
   @error: rgb(255, 30, 30);
   @warn: rgb(240, 192, 0);
   @success: rgb(0, 144, 74);
   @info: rgb(0, 80, 218);
   
   @errorBg: rgb(255, 208, 208);
   @warnBg: rgb(255, 245, 207);
   @successBg: rgb(210, 255, 233);
   @infoBg: rgb(203, 222, 255);
   
   .notice__root {
     user-select: none;
     padding: 5px 50px 5px 5px;
   }
   
   .noticer {
     padding: 5px 20px;
     margin: 10px 0px;
     // margin-right: 50px;
     border-radius: 8px;
     font-size: 16px;
     width: auto;
     min-width: 280px;
     max-width: 300px;
     word-break: break-all;
     text-align: center;
     box-sizing: border-box;
   }
   .notice-type-error {
     color: @error !important;
     border: 2px solid @error;
     box-shadow: 1px 1px 5px 2px @errorBg;
     background-color: @errorBg;
   
     // border: 1px solid red;
   }
   .notice-type-warn {
     color: @warn !important;
     border: 2px solid @warn;
     background-color: @warnBg;
     box-shadow: 1px 1px 5px 2px @warnBg;
   }
   .notice-type-success {
     color: @success !important;
     border: 2px solid @success;
     background-color: @successBg;
     box-shadow: 1px 1px 5px 2px @successBg;
   }
   .notice-type-info {
     color: @info !important;
     border: 2px solid @info;
     background-color: @infoBg;
     box-shadow: 1px 1px 5px 2px @infoBg;
   }
   </style>
   

2. 組件動態創建腳本：

   NotificationBanner.js

   import Vue from "vue";
   import Notice from "@/components/Noticer/Notice.vue";
   
   function create(Component, props) {
     // 先建立實例
     const vm = new Vue({
       render(h) {
         //h就是createElement,它返回VNode
         return h(Component, { props });
       },
     }).$mount();
     // 手動掛載
   
     // 判斷是否存在container，如果不存在則先創建
     let container;
     container = document.querySelector(".noticer-container");
     if (container == null) {
       container = document.createElement("div");
       container.classList.add("noticer-container");
       container.style.position = "fixed";
       container.style.top = "50px";
       container.style.right = "0px";
       container.style.overflow = "hidden";
       container.style.zIndex = 9999;
   
       document.body.appendChild(container);
     }
   
     container.appendChild(vm.$el);
   
     //銷燬方法
     const comp = vm.$children[0];
     comp.remove = function () {
       container.removeChild(comp["$el"]);
       vm.$destroy();
     };
     comp.show();
     return comp;
   }
   
   Vue.prototype.$notice = {
     error: function (props) {
       create(Notice, Object.assign(props, { type: "error" }));
     },
     info: function (props) {
       create(Notice, Object.assign(props, { type: "info" }));
     },
     success: function (props) {
       create(Notice, Object.assign(props, { type: "success" }));
     },
     warn: function (props) {
       create(Notice, Object.assign(props, { type: "warn" }));
     },
   };
   
   

3. 在 main.js 中引入執行該腳本即可

   import Vue from "vue";
   import App from "./App.vue";
   import "animate.css";
   import "@/components/Noticer/NotificationBanner.js";
   
   
   new Vue({
     render: (h) => h(App),
   }).$mount("#app");