PresentationAPI使用教程(Vue3&html) 　W3C在2020年12月份出台了Presentation API规范，这个api接口允许用户自由控制投放在其他屏幕上，并和投放窗口通信，查看W3C规范。演示地址：投屏演示，详细demo（Vue3/HTML）见文章末尾{alert type="error"} 特别注意：需要注意必须为https环境{/alert}　1、创建一个PresentationRequest对象，该对象将包含我们要在辅助附加显示器上显示的地址。const presentationRequest = new PresentationRequest('receiver.html');　2、做控制及监听事件/* * @Author: lzx * @Date: 2022-07-08 15:34:16 * @LastEditors: lzx * @LastEditTime: 2022-07-08 17:14:31 * @Description: Fuck Bug * @FilePath: \test\js\index.js */ // 创建个投屏对象 const presentationRequest = new PresentationRequest(['https://blog.fxnws.com']); // 投屏网址 // const presentationRequest = new PresentationRequest(['test.html']);//投屏页面 // Make this presentation the default one when using the "Cast" browser menu. navigator.presentation.defaultRequest = presentationRequest; let presentationConnection; //监视连接是否可用 presentationRequest.addEventListener('connectionavailable', function (event) { presentationConnection = event.connection; presentationConnection.addEventListener('close', function () { console.log('> Connection closed.'); }); presentationConnection.addEventListener('terminate', function () { console.log('> Connection terminated.'); }); presentationConnection.addEventListener('message', function (event) { console.log('> ' + event.data); }); }); //监视可用的显示器 presentationRequest.getAvailability() .then(availability => { console.log('Available presentation displays: ' + availability.value); availability.addEventListener('change', function () { console.log('> Available presentation displays: ' + availability.value); }); }) .catch(error => { console.log('Presentation availability not supported, ' + error.name + ': ' + error.message); }); // 开启投屏 function startProjectionScreen () { presentationRequest.start() .then(connection => { console.log('Connected to ' + connection.url + ', id: ' + connection.id); }) .catch(error => { console.log(error); }); } //发送消息 function sendMsg () { const message = '发送消息测试'; const lang = document.body.lang || 'en-US'; console.log('Sending "' + message + '"...'); presentationConnection.send(JSON.stringify({ message, lang })); } //关闭连接，关闭连接后无法再控制弹出窗口 function closeLink () { console.log('Closing connection...'); presentationConnection.close(); } //关闭连接后，换可以重新再次连接，这里需要指定id // presentationRequest.reconnect(presentationId); //关闭弹窗，结束连接调用 function endLink () { console.log('Terminating connection...'); presentationConnection.terminate(); }　3、连接端页面消息的展示（搬运的官方）/* * @Author: lzx * @Date: 2022-07-08 15:34:16 * @LastEditors: lzx * @LastEditTime: 2022-07-08 15:34:30 * @Description: Fuck Bug * @FilePath: \test\js\test.js */ let connectionIdx = 0; let messageIdx = 0; //如果有连接建立，则调用该函数 function addConnection (connection) { connection.connectionId = ++connectionIdx; addMessage('New connection #' + connectionIdx); connection.addEventListener('message', function (event) { messageIdx++; const data = JSON.parse(event.data); const logString = 'Message ' + messageIdx + ' from connection #' + connection.connectionId + ': ' + data.message; addMessage(logString, data.lang); maybeSetFruit(data.message); connection.send('Received message ' + messageIdx); }); connection.addEventListener('close', function (event) { addMessage('Connection #' + connection.connectionId + ' closed, reason = ' + event.reason + ', message = ' + event.message); }); }; const fruitEmoji = { 'grapes': '\u{1F347}', 'watermelon': '\u{1F349}', 'melon': '\u{1F348}', 'tangerine': '\u{1F34A}', 'lemon': '\u{1F34B}', 'banana': '\u{1F34C}', 'pineapple': '\u{1F34D}', 'green apple': '\u{1F35F}', 'apple': '\u{1F34E}', 'pear': '\u{1F350}', 'peach': '\u{1F351}', 'cherries': '\u{1F352}', 'strawberry': '\u{1F353}' }; function addMessage (content, language) { const listItem = document.createElement("li"); if (language) { listItem.lang = language; } listItem.textContent = content; document.querySelector("#message-list").appendChild(listItem); }; function maybeSetFruit (message) { const fruit = message.toLowerCase(); if (fruit in fruitEmoji) { document.querySelector('#main').textContent = fruitEmoji[fruit]; } }; //文档载入后，监听连接 document.addEventListener('DOMContentLoaded', function () { if (navigator.presentation.receiver) { navigator.presentation.receiver.connectionList.then(list => { list.connections.map(connection => addConnection(connection)); list.addEventListener('connectionavailable', function (event) { addConnection(event.connection); }); }); } }); 　4、接收端页面构<!-- * @Author: lzx * @Date: 2022-07-08 15:34:05 * @LastEditors: lzx * @LastEditTime: 2022-07-08 15:35:13 * @Description: Fuck Bug * @FilePath: \test\test.html --> <!doctype html> <html> <head> <meta charset="utf-8"> <title>Demo Receiver</title> <style type="text/css"> html, body { height: 100%; margin: 0; font-family: sans-serif; background: radial-gradient(ellipse at center, #333333 0%, #000000 100%); color: #fff; } #main { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); text-align: center; font-size: 54px; } </style> <script type="text/javascript" src="引入3的代码块"></script> </head> <body> <div id="main">Hello World!</div> <ul id="message-list"> </ul> </body> </html>　5、vue3页面<template> <div class="container"> <button @click="startProjectionScreen">开启投屏</button> <button @click="sendMsg">发送消息</button> <!-- <button @click="closeLink">关闭连接</button> --> <button @click="endLink">结束调用</button> </div> </template> <script lang="ts"> // @ts-nocheck 不在当前文件中执行类型检查 import { toRefs, reactive, onMounted, watchEffect, onUnmounted } from 'vue' export default { props: {}, components: {}, setup () { const presentationRequest = new PresentationRequest(['https://blog.fxnws.com']); // 投屏网址 // const presentationRequest = new PresentationRequest(['test.html']); // 投屏本地页面 navigator.presentation.defaultRequest = presentationRequest; let presentationConnection; // 传参 const state = reactive({ }) const startProjectionScreen = () => { presentationRequest.start() .then(connection => { console.log('Connected to ' + connection.url + ', id: ' + connection.id); }) .catch(error => { console.log(error); }); } //发送消息 const sendMsg = () => { const message = '发送消息测试'; const lang = document.body.lang || 'en-US'; console.log('Sending "' + message + '"...'); presentationConnection.send(JSON.stringify({ message, lang })); } //关闭连接，关闭连接后无法再控制弹出窗口 const closeLink = () => { console.log('Closing connection...'); presentationConnection.close(); } //关闭连接后，换可以重新再次连接，这里需要指定id // presentationRequest.reconnect(presentationId); //关闭弹窗，结束连接调用 const endLink = () => { console.log('Terminating connection...'); presentationConnection.terminate(); } // 挂载 onMounted(() => { //监视连接是否可用 presentationRequest.addEventListener('connectionavailable', function (event) { presentationConnection = event.connection; presentationConnection.addEventListener('close', function () { console.log('> Connection closed.'); }); presentationConnection.addEventListener('terminate', function () { console.log('> Connection terminated.'); }); presentationConnection.addEventListener('message', function (event) { console.log('> ' + event.data); }); }); //监视可用的显示器 presentationRequest.getAvailability() .then(availability => { console.log('Available presentation displays: ' + availability.value); availability.addEventListener('change', function () { console.log('> Available presentation displays: ' + availability.value); }); }) .catch(error => { console.log('Presentation availability not supported, ' + error.name + ': ' + error.message); }); }) // 监听 watchEffect(() => { console.log('监听') }) // 页面卸载 onUnmounted(() => { console.log('页面卸载') }) return { ...toRefs(state), endLink, closeLink, sendMsg, startProjectionScreen } } } </script> <style scoped> </style> 　6、详细demo附件下载隐藏内容，请前往内页查看详情2024年11月04日更新，看到评论区有部分朋友，遇到问题，我更新了相关Git完整Demo地址见下文1、vue3+ts+vite 报错 PresentationRequest 未定义 答：应该是ts未定义的报错，我当时做这个的时候，这个功能刚推出ts支持应该不完善，我也不想去定义相关的ts就直接使用// @ts-nocheck（这个指令用于告诉TypeScript编译器不在当前文件中执行类型检查）2、发现用ip访问不行，用127.0.0.1可以 答：直接用IP不行是因为没有https支持吧，我记得这个协议是需要https的支持的，具体要看下报错信息了，127.0.0.1是本机地址所以没事{alert type="warning"} 码云 {/alert}{alert type="warning"} Github {/alert}