这是一个旧的答案，我建议使用此处描述的现代版本：
Javascript;具有相同来源的选项卡/窗口之间的通信
您可以使用cookie在浏览器窗口之间（以及选项卡之间）进行通信。
这是发送方和接收方的示例：
sender.html
<h1>Sender</h1><p>Type into the text box below and watch the text appear automatically in the receiver.</p><form name="sender"><input type="text" name="message" size="30" value=""><input type="reset" value="Clean"></form><script type="text/javascript"><!--function setcookie(value) { document.cookie = "cookie-msg-test=" + value + "; path=/"; return true;}function updateMessage() { var t = document.forms['sender'].elements['message']; setcookie(t.value); setTimeout(updateMessage, 100);}updateMessage();//--></script>receiver.html：
<h1>Receiver</h1><p>Watch the text appear in the text box below as you type it in the sender.</p><form name="receiver"><input type="text" name="message" size="30" value="" readonly disabled></form><script type="text/javascript"><!--function getcookie() { var cname = "cookie-msg-test="; var ca = document.cookie.split(';'); for (var i=0; i < ca.length; i++) { var c = ca[i]; while (c.charAt(0)==' ') c = c.substring(1,c.length); if (c.indexOf(cname) == 0) { return c.substring(cname.length, c.length); } } return null;}function updateMessage() { var text = getcookie(); document.forms['receiver'].elements['message'].value = text; setTimeout(updateMessage, 100);}updateMessage();//--></script>
