background.js Uncaught TypeError: Cannot read property 'xxx' of undefined
阿新 • • 發佈：2019-02-03
chrome extensions 開發過程中 background.js 呼叫chrom.** js的過程中經常遇到
background.js:24 Uncaught TypeError: Cannot read property 'onClicked' of undefined
at background.js:24
chrome.browserAction.onClicked.addListener(function(tab) {
alert("hello world");解決辦法
onClicked
Fired when a browser action icon is clicked.
addListener
chrome.browserAction.onClicked.addListener(function callback)
| Parameters | ||
|---|---|---|
| function | callback |
The callback parameter should be a function that looks like this: function(tabs.Tab tab){...};
|
去掉default_popup 就可以了"browser_action": { "default_icon": "image/icon.png" , "default_title": "default title", "default_popup": "popup.html" },
第二個錯誤
_generated_background_page.html:1 Error in event handler for runtime.onInstalled: TypeError: Cannot read property 'onPageChanged' of undefined
at chrome-extension://ncbflhomeaakikacjdicoamijeabneml/js/background.js:8:27
chrome.runtime.onInstalled.addListener(function() { // Replace all rules ... chrome.declarativeContent.onPageChanged.removeRules(undefined, function() {
解決辦法
chrome.declarativeContent
| Description: | Use the chrome.declarativeContent API
to take actions depending on the content of a page, without requiring permission to read the page's content. |
| Availability: | Since Chrome 33. |
| Permissions: | "declarativeContent" |
至此問題解決
總結： 遇到這種錯誤一般都是相關屬性使用錯誤
主要參考官方文件