chrome 插件通信DEOM

基础概念

manifest.json 插件配置
content_script 注入脚本，可读取页面中的dom，以及window对象方法
backgound 插件脚本,

页面与插件之间的同行管道：

页面 -> content_script : dom

content_script -> background : chrome.runtime

插件内的通信方法

chrome.runtime.sendMessage 发送数据
chrome.runtime.onMessage.addListener 接收数据

DEMO

1. 页面端

// 页面内配置通信dom
 <div id='plugin-pip'/>

// 页面通信插件
const PIP_DOM_ID = 'plugin-pip'
const SEND_KEY = 'SEND_MSG_FROM_APP'
const LISTENER_KEY = 'LISTENER_PLUGIN_MSG'
const DATA_SAVE_KEY = 'DATA-MSG'

export class PluginPip{

    static instance = null

    constructor(){

        if(PluginPip.instance){
            return PluginPip.instance
        }
        
        this.pip = document.querySelector(`#${this.conf.PIP_DOM_ID}`)
        this.listener = new Set()
        this.init()

        PluginPip.instance = this
        
    }

    init(){
        this.pip.addEventListener(this.conf.LISTENER_KEY, (e) =>{
            
            console.log(e)
            let data = {}
            
            try {
                data = JSON.parse(this.pip.getAttribute(this.conf.DATA_SAVE_KEY))
            } catch (error) {
                console.error("插件接收数据格式化失败: ", error)                
            }
            
            this.listener.forEach(callback => callback(data))

        })
    }

    send(type, data={}){

        
        const msg = {type, data}
        let msgStr = ''

        console.table('send: ', msg)
        
        try {
            msgStr = JSON.stringify(data)
        } catch (error) {
            console.error("插件发送数据格式化失败: ", error)                
            return error
        }

        sessionStorage.setItem(this.conf.DATA_SAVE_KEY, msgStr)

        const evt = document.createEvent("HTMLEvents");
        evt.initEvent(this.conf.SEND_KEY, false, false);
        this.pip.dispatchEvent(evt)
                
    }
    
    // 获取配置
    get conf(){
        return PluginPip.conf()
    }
    
    // 获取配置静态方法
    static conf(){
        return {
            PIP_DOM_ID,
            SEND_KEY,
            LISTENER_KEY,
            DATA_SAVE_KEY
        }
    }
}


// 初始化插件
const pip = new PluginPip()

// 添加接收
pip.listener.add((data) =>{
    console.log('from plugin: ', data)
})

// 发送数据
pip.send("msg", {id: 'xx', name:'xx'})

2. content_script

// 获取通信管道
const pip = document.querySelector('#plugin-pip')

// 配置接收
pip.addEventListener("SEND_MSG_FROM_APP", (s) =>{
    const msg = window.sessionStorage.getItem('DATA-MSG')
    console.log("from app: ", msg)
    // 转发到backgfound
    chrome.runtime.sendMessage(msg, () =>{})
})

3. backgound

// 接收 content_script 消息
chrome.runtime.onMessage.addListener(function(msg, sender, sendResponse){
    console.log(JSON.parse(msg))
})