在Chrome扩展中写入本地文件系统 [英] Writing to local file system in Chrome extension
问题描述
chrome.tabs.onUpdated.addListener(checkForValidUrl);
函数checkForValidUrl(tabId,changeInfo,tab){
if(tab.url.indexOf('https')> -1){
var tabURL = tab.url;
console.log(\\\
< TimeStamp>+ getTimestamp()+< / TimeStamp><浏览器> Chrome< /浏览器><网址>+ tabURL +< / URL> \\\
);
window.requestFileSystem(window.PERSISTENT,5 * 1024 * 1024,initFs);
函数initFs(fs){
fs.root.getFile
('log.txt',{create:true,exclusive:true},function(fileEntry){
fileEntry.isFile = true;
fileEntry.name ='log.txt';
fileEntry.fullPath ='/log.txt';
fileEntry.createWriter(function(fileWriter) {
fileWriter.seek(fileWriter.length);
var bb = new BlobBuilder();
bb.append(\\\
< TimeStamp>+ getTimestamp()+< / TimeStamp>< Browser> Chrome< / Browser>< URL>+ tabURL +< / URL> \\\
);
fileWriter.write(bb.getBlob('text / plain') );
});
});
在撰写本文时,
Google Chrome 9+是唯一可以工作的
实现FileSystem API。
由于专用的浏览器用户界面不存在用于文件/配额管理的
,因此
无法在没有运行
的情况下使用API,因为
- unlimited-配额(注意:如果您为Chrome网上应用店构建应用程序或
扩展程序,
unlimitedStorage清单文件
权限就足够了)。
在 http:// www.html5rocks.com/tutorials/file/filesystem/#toc-support
我假设您使用的是Chrome,但您尚未设置 - 无限配额文件标志
chrome.tabs.onUpdated.addListener(checkForValidUrl);
function checkForValidUrl(tabId, changeInfo, tab) {
if (tab.url.indexOf('https') > -1) {
var tabURL = tab.url;
console.log("\n<TimeStamp>" + getTimestamp() + "</TimeStamp><Browser>Chrome</Browser><URL>" + tabURL + "</URL>\n");
window.requestFileSystem(window.PERSISTENT, 5 * 1024 * 1024, initFs);
function initFs(fs) {
fs.root.getFile
('log.txt', { create: true, exclusive: true }, function (fileEntry) {
fileEntry.isFile = true;
fileEntry.name = 'log.txt';
fileEntry.fullPath = '/log.txt';
fileEntry.createWriter(function (fileWriter) {
fileWriter.seek(fileWriter.length);
var bb = new BlobBuilder();
bb.append("\n<TimeStamp>" + getTimestamp() + "</TimeStamp><Browser>Chrome</Browser><URL>" + tabURL + "</URL>\n");
fileWriter.write(bb.getBlob('text/plain'));
});
});
}
}
}
Based on this:
At the time of writing this article, Google Chrome 9+ has the only working implementation of the FileSystem API. Since a dedicated browser UI does not yet exist for file/quota management, the API cannot be used without running Chrome with the --unlimited-quota-for-files flag (Note: if you're building an app or extension for the Chrome Web Store, the unlimitedStorage manifest file permission will suffice).
found at http://www.html5rocks.com/tutorials/file/filesystem/#toc-support
I assume you are using Chrome and that you have not set the --unlimited-quota-for-files flag
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