de-net/src/uilts/messageCenter/content/index.js

class MessageCenter {
    constructor() {
        this.iframeMap = new Map();
        this.messageCallbackMap = new Map();
        // this.listen()
    }

    findIframeById(id) {
        let target = this.iframeMap.get(id);
        if (!target) {
            target = document.getElementById(id)
            this.iframeMap.set('id', target)
        }
        return target
    }

    send({ info, data }) {
        const target = this.findIframeById(info.iframeId);
        target && target.contentWindow.postMessage({
            info,
            data
        }, '*')
    }

    // ---- don't use ---- 
    // add(actionType, callback) {
    //     let activeQuene = this.messageCallbackMap.get(actionType);
    //     if (activeQuene?.length > 0) {
    //         activeQuene.push(callback)
    //     } else {
    //         this.messageCallbackMap.set(actionType, [callback])
    //     }
    // }
    // ---- don't use ---- 
    // listen() {
    //     window.addEventListener('message', (e) => {
    //         const { actionType, data } = e.data;
    //         console.log('get message in content ...', actionType, data)
    //         const quene = this.messageCallbackMap.get(actionType) || [];
    //         while (quene.length > 0) {
    //             let callback = quene.pop();
    //             callback(data)
    //         }
    //     })
    // }
}

const messageCenter = new MessageCenter();

export default messageCenter;