当我尝试向另一个扩展发送消息时,有时我可能具有无效的ID(该扩展可能已被删除),但是sendMessage从来没有将其通知我。据我所知,它只是打印到console.error:

这是Chrome的源代码的miscellaneous_bindings第235行:

chromeHidden.Port.dispatchOnDisconnect = function(  portId, errorMessage)
{
    var port = ports[portId];
    if (port) {
        // Update the renderer's port bookkeeping, without notifying the browser.
        CloseChannel(portId, false);
        if (errorMessage) {
            lastError.set(errorMessage, chrome);
            //It prints: Port error: Could not establish connection. Receiving end does not exist.
            console.error("Port error: " + errorMessage);
        }
        try {
            port.onDisconnect.dispatch(port);
        } finally {
            port.destroy_();
            lastError.clear(chrome);
        }
    }
};

结果,我的应用程序反复尝试发送消息。我唯一的提示是从sendResponse()发送回一个空响应,但是任何应用程序都可以发送空响应对象!我怎么知道它失败了?

最佳答案

sendResponse的回调中,查看 chrome.runtime.lastError 属性。

chrome.runtime.sendMessage("ID of extension", "message", function(response) {
    var lastError = chrome.runtime.lastError;
    if (lastError) {
        console.log(lastError.message);
        // 'Could not establish connection. Receiving end does not exist.'
        return;
    }
    // Success, do something with response...
});

10-04 16:17