js a页面取b页面的值

// 在B页面设置值
localStorage.setItem('sharedData', 'Hello from B page');

// 在A页面获取值
const data = localStorage.getItem('sharedData');
console.log(data); // 输出: Hello from B page

// 在B页面发送消息
const channel = new BroadcastChannel('data_channel');
channel.postMessage('Hello from B page');

// 在A页面接收消息
const channelA = new BroadcastChannel('data_channel');
channelA.onmessage = (event) => {
  console.log(event.data); // 输出: Hello from B page
};

// shared-worker.js
const connections = [];
onconnect = function(e) {
  const port = e.ports[0];
  connections.push(port);

  port.onmessage = function(e) {
    connections.forEach(conn => {
      conn.postMessage(e.data);
    });
  };
};

// 在B页面发送消息
const worker = new SharedWorker('shared-worker.js');
worker.port.start();
worker.port.postMessage('Hello from B page');

// 在A页面接收消息
const workerA = new SharedWorker('shared-worker.js');
workerA.port.start();
workerA.port.onmessage = (event) => {
  console.log(event.data); // 输出: Hello from B page
};

// 在B页面设置URL参数
window.location.href = 'a.html?data=Hello%20from%20B%20page';

// 在A页面获取URL参数
const params = new URLSearchParams(window.location.search);
const data = params.get('data');
console.log(data); // 输出: Hello from B page