javascript - 无法读取未定义的属性 'onBeforeRequest'

Question

我看了其他有同样问题的问题，但找不到解决方案。我的 manifest.json:

{
   "background": {
      "scripts": [ "js/background.js" ],
   },
   "description": "...",
   "icons": {
      "128": "icons/128.png",
      "16": "icons/16.png",
      "48": "icons/48.png"
   },
   "manifest_version": 2,
   "name": "Name it!",
   "offline_enabled": false,
   "permissions": [ "webRequest", "webRequestBlocking", "https://www.youtube.com/*" ],
   "permissions": [ "https://www.youtube.com/*" ],
   "version": "1.0"

}

和我的background.js:

chrome.webRequest.onBeforeRequest.addListener(
    function(details) {
        var idid = details.url;
        var vid = idid.split("watch?v=");
        var akk = vid[1];
        if (akk.includes("&") && akk.includes("=")) {
            akk = akk.split("&")[0];
        }
        var xhr = new XMLHttpRequest();
        xhr.open("GET", "https://www.youtube.com/feeds/videos.xml?channel_id=xxx", false);
        xhr.send();
        var result = xhr.responseText;
        if(result.includes(akk)) {
            redirectUrl : "chrome-extension://"+window.location.hostname+"/html/block.html"
        }
    },
{urls: ["https://www.youtube.com/*"]},
["blocking"]);

我收到这个错误:

Uncaught TypeError: Cannot read property 'onBeforeRequest' of undefined

可能是什么问题？

Answer 1

您的 manifest.json 可能是原因。

它有重复的“权限”条目。尝试删除第二个。

 "permissions": [ "webRequest", "webRequestBlocking", "https://www.youtube.com/*" ],
 "permissions": [ "https://www.youtube.com/*" ], // remove this one