在chrome扩展程序中,我尝试从后台脚本向内容脚本发送消息。我没有在内容脚本中收到消息。哪里出错了?这是background.js
function createAlarm() {
chrome.alarms.create('bookcab', {
periodInMinutes: 1
});
}
chrome.alarms.onAlarm.addListener(function(alarm) {
if (alarm.name === 'bookcab') {
var url = 'http://cab/';
chrome.tabs.create({ url:url, active: true });
chrome.tabs.query({active:true}, function(tabs){
chrome.tabs.sendMessage(tabs[0].id, {"message": "sample_msg"});
});
}
});
createAlarm();
content_script.js具有以下代码,
chrome.runtime.onMessage.addListener(
function(request,sender,sendresponse) {
if( request.message === "sample_msg" ) {
console.log('message from content script');
}
}
);
如果重要的话,这里是manifest.json
{
"manifest_version": 2,
"name":"bookcab",
"version":"0.1",
"background": {
"scripts":["background.js"]
},
"permissions": [
"alarms",
"tabs"
],
"content_scripts": [{
"matches":["<all_urls>"],
"js": ["content_script.js"],
"run_at" : "document_end"
}]
}
答案 0 :(得分:1)
在向内容脚本发送消息之前,我已经包含了一个标签加载完成。
等待TAB完全加载
chrome.tabs.onUpdated.addListener(function (tabId, changeInfo, tab) {
if (changeInfo.status == 'complete') {
chrome.tabs.query({active: true}, function(tabs){
chrome.tabs.sendMessage(tabs[0].id, {"message": "sample_msg"});
}
}
});