酒店网站规划建设方案书刷关键词排名软件有用吗
BroadcastChannel与MessageChannel
BroadcastChannel
BroadcastChannel以广播的形式进行通信
BroadcastChannel用于创建浏览器标签页之间的通信
使用BroadcastChannel的浏览器标签页面必须要遵循同源策略
页面1使用BroadcastChannel创建一个频道,页面2使用BroadcastChannel链接频道,页面1与页面2即可通信。
let m1=new BroadcastChannel("channel");//入参是创建或链接的频道名,没有频道则创建通信频道,有频道则进入频道
m1.postMessage('data数据');//以广播的形式向其他链接频道的标签发送消息
m1.onmessage=(e)=>{console.log(e);//接收频道发送过来的消息
}
实例
//BroadcastChannel1.html
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title>
</head>
<body><a href="http://127.0.0.1:8080/BroadcastChannel2.html" target="_blank">打开新的标签页</a><button onclick="send()">点击</button><script>const m1=new BroadcastChannel('one');function send(){m1.postMessage({data:"123123"})}m1.onmessage=(e)=>{console.log('e=>',e);}</script>
</body>
</html>//BroadcastChannel2.html
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title>
</head>
<body><script>const m1=new BroadcastChannel('one');m1.onmessage=(e)=>{console.log("e=>",e)}m1.postMessage('adad')</script>
</body>
</html>
MessageChannel
MessageChannel以通道的形式进行传值
MessageChannel无法跨越浏览器标签页通信,只能在当前标签页进行通信
MessageChannel的对象只有两个端口:prot1、port2
let m=new MessageChannel();//创建消息通道
//m有两个端口:prot1、prot2
m.port1.postMessage("data数据");//prot1数据肯定是向prot2发送,同理prot2也只能向prot1发送数据
m.prot2.onmessage=(e)=>{console.log(e);//prot2接收prot1发送的数据
}
实例
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title>
</head>
<body><script>let m=new MessageChannel();m.port1.postMessage("data");m.port2.onmessage=(e)=>{console.log(e);}</script>
</body>
</html>
Tips:使用MessageChannel传递的引用数据类型是深拷贝。也就是改变端口数据的值,发送端的数据不会改变。