相关疑难解决方法(0)

如何在以下脚本中添加超时？我希望它将文本显示为"超时".

var bustcachevar = 1 //bust potential caching of external pages after initial request? (1=yes, 0=no)
var loadedobjects = ""
var rootdomain = "http://" + window.location.hostname
var bustcacheparameter = ""

function ajaxpage(url, containerid) {
    var page_request = false
    if (window.XMLHttpRequest) // if Mozilla, Safari etc
        page_request = new XMLHttpRequest()
    else if (window.ActiveXObject) { // if IE
        try {
            page_request = new ActiveXObject("Msxml2.XMLHTTP")
        } catch (e) {
            try {
                page_request = new ActiveXObject("Microsoft.XMLHTTP")
            } catch (e) {}
        }
    } …

尝试在我的内容和后台脚本之间进行通信时,我收到以下错误:

Port error: Could not establish connection. Receiving end does not exist.
Error in event handler for 'undefined': Cannot read property 'message' of undefined       
TypeError: Cannot read property 'message' of undefined

background.js

function onRequest(request, sender, callbackFunction) {
    console.log("Me (BS) became this Message:" + request.message);
    sendResponse({message: request.message})
};
chrome.extension.onRequest.addListener(onRequest);

streamcloud.js

function contactBackground(nachricht){
    chrome.extension.sendMessage({message: nachricht}, function(response) {
        console.log("The Background Script got the following Message: " + response.message);
    });
}

和我的manifest.json

{
  "name": "InstantWatch - Dev",
  "manifest_version": 2,
  "version": "0.7",
  "permissions": ["tabs", …