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 @R_836_2419@ 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 @R_836_2419@ 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>
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