chrome.tabs.executeScript没有从内容页面返回结果 [英] chrome.tabs.executeScript is not returning results from content page
问题描述
我正在开发一个chrome扩展程序，尝试从我所在的网页返回所有h2标签.如果chrome.tabs.executeScript很简单，例如
I am working on a chrome extension where I attempt to return all h2 tags from the web page i am on. chrome.tabs.executeScript will work if its simple such as
chrome.tabs.executeScript(null,{
code: 'console.log("hello")'
});
但以下操作无效
chrome.tabs.executeScript(null,{
code: 'document.getElementsByTagName("h2");'
},function (results){
alert(results.length);
for(var i = 0; i < results.length;i++){
console.log(results[i].innerHTML);
}
});
index.html:
index.html:
<body>
<h1>app</h1>
<div id="container">
<span>Choose an action</span>
<button id="someFunc">click here for function</button>
<script type="text/javascript" src="popup.js"></script>
</div>
popup.js
chrome.tabs.executeScript(null,{
code: 'document.getElementsByTagName("h2");'
},function (results){
alert(results.length);
for(var i = 0; i < results.length;i++){
console.log(results[i].innerHTML);
}
});
除了名称，描述，版本.这是我的manifest.js
other than the name, description, version. this is my manifest.js
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
},
"permissions": [
"activeTab",
"storage","http://*/*",
"https://*/*"
]
我正在测试的代码来自此处的答案之一. chrome.tabs.executeScript():如何获得结果内容脚本?
The code I'm testing is from one of the answers here. chrome.tabs.executeScript(): How to get result of content script?
它可能相关，也可能不相关，但是当我将警报消息放入回调函数中时，它们会立即消失.我试过包括所有allFrames:细节上为true，但没有运气.
It may or may not be relevant but when I put alert messages in the callback function they disappear instantly. I've tried including all allFrames: true in the details but no luck.
推荐答案
您不能使用executeScript返回DOM节点.但是，如果您需要他们的innerHTML，则可以使用它返回一个数组.
You can't return DOM nodes using executeScript. But if you need their innerHTML you can return an array with it.
chrome.tabs.executeScript(null,{
code: 'Array.from(document.getElementsByTagName("h2")).map(h => h.innerHTML)'
},function (results){
console.log(results);
});
这篇关于chrome.tabs.executeScript没有从内容页面返回结果的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
