通常没有直接的方法来访问不同来源的 window 对象.如果您想在不同框架中的内容脚本之间安全通信，您必须向后台页面发送一条消息，后台页面又将消息发送回选项卡.

There's generally no direct way of accessing a different-origin window object. If you want to securely communicate between content scripts in different frames, you have to send a message to the background page which in turn sends the message back to the tab.

这是一个例子:

manifest.json 的一部分:

"background": {"scripts":["bg.js"]},
"content_scripts": [
    {"js": ["main.js"], "matches": ["<all_urls>"]},
    {"js": ["sub.js"], "matches": ["<all_urls>"], "all_frames":true}
]

main.js:

var isTop = true;
chrome.runtime.onMessage.addListener(function(details) {
    alert('Message from frame: ' + details.data);
});

sub.js:

if (!window.isTop) { // true  or  undefined
    // do something...
    var data = 'test';
    // Send message to top frame, for example:
    chrome.runtime.sendMessage({sendBack:true, data:data});
}

后台脚本'bg.js':

Background script 'bg.js':

chrome.runtime.onMessage.addListener(function(message, sender) {
    if (message.sendBack) {
        chrome.tabs.sendMessage(sender.tab.id, message.data);
    }
});

另一种方法是使用 bg.js 中的 chrome.tabs.executeScript 来触发主内容脚本中的函数.

An alternative method is to use chrome.tabs.executeScript in bg.js to trigger a function in the main content script.

• 消息传递 ^{c.runtime.sendMessage/c.tabs.sendMessage/c.runtime.onMessage}
• MessageSender 和 Tab 类型.
• 内容脚本
• chrome.tabs.executeScript莉>