Chrome扩展程序存储大量数据 [英] Chrome extension store large amounts of data

问题描述

我正在寻找一种有效的方法来在我的Chrome扩展中存储大量数据。我有几个大约1-2mb的txt文件。
我希望我的Chrome扩展在本地缓存它们，所以我不需要每次都抓取它们。
我找到了 syncFileSystem ，但这只适用于打包应用程序。

尝试安装此扩展程序时出现警告：

'syncFileSystem'只允许对于打包的应用程序，但是这是一个
的扩展名。

什么是将这类数据存储在Chrome扩展？

manifest.json

  {
 manifest_version：2，
name：__MSG_name__，
version：1.0，
default_locale：en，
description： __MSG_description__，
图标：{
16：img / logo_enabled_16.png，
48：img / logo_enabled_48.png，
 128：img / logo_enabled_128.png
}，
browser_action：{
default_icon：img / logo_enabled_48.png，
default_title： __MSG_br 
default_popup：options.html
}，
background：{
scripts：[
js / chrome.js ，
js / filter.js，
js / background.js
]，
持久性：true 
}，
 content_scripts：[{
matches：[
http：// * / *，
https：// * / *
]，
js：[
js / docReady.js，
js / content.js
] 
}]，
offline_enabled： true，
options_ui：{
chrome_style：true，
page：options.html
}，
permissions：[
activeTab，
标签，
webRequest，
webRequestBlocking，
webNavigation，
存储，
syncFileSystem，
http：// * / *，
https：// * / *
，
short_name：__MSG_ shortName，
minimum_chrome_version：45.0.2454.101，
web_accessible_resources：[
css / bootstrap.min.css，
js / jquery.min .js，
js / chrome.js，
js / bootstrap.min.js
] 
} 
  
 
解决方案
只有 WebSQL ， IndexedDB ， chrome.storage.local 和HTML5 文件系统（沙盒文件系统）可以通过 unlimitedStorage权限。  
 $ b  manifest.json：permissions：[unlimitedStorage]  
 
 
  
 
为存储HTML5客户端数据（如数据库和本地存储文件）提供无限配额。没有此权限，扩展程序或应用程序被限制为5 MB的本地存储空间。
 
 
注释：
 
 
 
 
 
 W3C赞成使用较慢的IndexedDB，而不赞成使用WebSQL，但我认为它会留在Chrome中，原因很明显，因为它是基于SQL的，所以它更快更灵活。 
 
 
  chrome.storage.local 是最容易使用的，但它可能不是大对象中最快的，请做一些测试if速度很重要。
 
 
如果收益显着，可以使用Zip / LZMA Javascript库来压缩/解压缩文本文件。
  
 
 
I'm looking for an efficient way to store large amounts of data in my chrome extension. I've got a few txt files which are around 1-2mb.
I'd like my chrome extension to 'cache' them locally so I don't need to fetch them every time.
I've found syncFileSystem but this is only available for packed apps.

  
There were warnings when trying to install this extension:
  
  
'syncFileSystem' is only allowed for packaged apps, but this is a
  extension.
What is the best way to store this sort of data in a chrome extension?

manifest.json
{
    "manifest_version": 2,
    "name": "__MSG_name__",
    "version": "1.0",
    "default_locale": "en",
    "description": "__MSG_description__",
    "icons" : {
        "16" : "img/logo_enabled_16.png",
        "48": "img/logo_enabled_48.png",
        "128": "img/logo_enabled_128.png"
    },
    "browser_action": {
        "default_icon": "img/logo_enabled_48.png",
        "default_title": "__MSG_browser_action_title__",
        "default_popup":"options.html"
    },
    "background": {
        "scripts": [
            "js/chrome.js",
            "js/filter.js",
            "js/background.js"
        ],
        "persistent": true
    },
    "content_scripts": [{
        "matches": [
            "http://*/*",
            "https://*/*"
        ],
        "js": [
            "js/docReady.js",
            "js/content.js"
        ]
    }],
    "offline_enabled":true,
    "options_ui": {
        "chrome_style": true,
        "page":"options.html"
    },
    "permissions": [
        "activeTab",
        "tabs",
        "webRequest",
        "webRequestBlocking",
        "webNavigation",
        "storage",
        "syncFileSystem",
        "http://*/*",
        "https://*/*"
    ],
    "short_name": "__MSG_shortName",
    "minimum_chrome_version":"45.0.2454.101",
    "web_accessible_resources":[
        "css/bootstrap.min.css",
        "js/jquery.min.js",
        "js/chrome.js",
        "js/bootstrap.min.js"
    ]
}

解决方案
Only WebSQL, IndexedDB, chrome.storage.local and HTML5 File System (sandboxed file system) can grow past 5MB limit via "unlimitedStorage" permission.

manifest.json: "permissions": ["unlimitedStorage"]

  
Provides an unlimited quota for storing HTML5 client-side data, such as databases and local storage files. Without this permission, the extension or app is limited to 5 MB of local storage.
Notes:


WebSQL is deprecated by W3C in favor of the slower IndexedDB but I think it will stay in Chrome for the obvious reason that it's faster and more flexible due to being SQL-based.
chrome.storage.local is the easiest to use but it may not be the fastest with the large objects, do some tests if speed is important.
Use a Zip/LZMA Javascript library to compress/decompress the text files if the gain is significant.


                        
这篇关于Chrome扩展程序存储大量数据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！