js MessageChannel 两个独立的窗口双向实时通信
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<script>
const { port1, port2 } = new MessageChannel()
// 监听port2的消息
port2.onmessage = (event) => {
console.log('收到消息:', event.data)
}
// 通过port1发送消息
port1.postMessage('Hello, Channel!')
</script>
</body>
</html>
index1.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<div>
<button onclick="handleOpen()">打开新页面</button>
<button onclick="handleClick()">传递port2</button>
<button onclick="handleSend()">发消息</button>
</div>
<script>
let channel = new MessageChannel()
let windowB
channel.port1.onmessage = (event) => {
console.log('Message from windowB:', event.data)
}
function handleOpen() {
windowB = window.open('index2.html')
}
function handleClick() {
try {
windowB.postMessage('init', '*', [channel.port2])
} catch (error) {
console.log(error)
channel = new MessageChannel()
channel.port1.onmessage = (event) => {
console.log('Message from windowB:', event.data)
}
windowB.postMessage('init', '*', [channel.port2])
}
}
function handleSend() {
channel.port1.postMessage('666')
}
</script>
</body>
</html>
index2.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<div>
<button onclick="handleSend()">发消息</button>
</div>
<script>
let port2
// 在接收 postMessage 时，获得 port2
window.addEventListener('message', (event) => {
if (event.data === 'init') {
port2 = event.ports[0]
port2.onmessage = (event) => {
console.log('Message from windowA:', event.data)
}
port2.postMessage('Hello from windowB')
}
})
function handleSend() {
port2.postMessage('777')
}
</script>
</body>
</html>
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原文地址：https://blog.csdn.net/xutongbao/article/details/142358939
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