javascript - Chrome API : sendMessage not receiving properly from content script to background. js

Question

<分区>

Answer 1

那解决了它——感谢重复问题链接。

为了让其他人更容易，这里是另一个答案所说的:

From the documentation for chrome.runtime.onMessage.addListener:

This function becomes invalid when the event listener returns, unless you return true from the event listener to indicate you wish to send a response asynchronously (this will keep the message channel open to the other end until sendResponse is called).

So you just need to add return true; after the [end of addListener] to indicate that you'll call the response function asynchronously.

这是正确的代码版本:

背景.js

chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
    if (request.method == "getSettings") {
        chrome.storage.sync.get(null, function (val) {
            sendResponse({data: "test"});
            console.log("Responding: " + val.radioSettings);
        });
    }
    return true;
});