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[英]ContentScript in Firefox extension without using the Add-On SDK
[英]How to develop Firefox Add-on SDK extension using localforage
我正在尝试开发一个Firefox附加SDK扩展,该扩展使用localforage库保存数据,但是出现以下错误:
Full message: ReferenceError: self is not defined
Full stack: polyfill@resource://browser-journey/node_modules/localforage/dist/localforage.js:259:9
@resource://browser-journey/node_modules/localforage/dist/localforage.js:689:1
@resource://browser-journey/node_modules/localforage/dist/localforage.js:7:2
@resource://browser-journey/index.js:6:19
run@resource://gre/modules/commonjs/sdk/addon/runner.js:147:19
我使用npm安装了localforage。
我认为问题可能是因为localforage中存在此问题 。 有解决方法吗?
此拉取请求刚刚合并到库中,似乎已解决了该问题。
localforage的作者并不打算支持Firefox插件,但这并不意味着它是不可能的。 这是相关的问题: https : //github.com/mozilla/localForage/issues/584
您可以为localforage编写自定义驱动程序: https : //github.com/mozilla/localForage/pull/282
或将此代码添加到dist/localforage.min.js
文件的顶部,然后再将其包含在插件中:
/**
* Detect Firefox SDK Addon environment and prepare some globals
*
* @author Dumitru Uzun (DUzun.Me)
*/
(function (window, undefined) {
if (typeof exports != "object" || typeof module == "undefined") return;
if ( window && window.Array === Array ) try {
window.window = window;
// Timers
if ( typeof setTimeout == 'undefined' ) {
expo(
require("sdk/timers")
, [
'setTimeout' , 'clearTimeout',
'setImmediate', 'clearImmediate'
]
);
}
// Blob, FileReader
var Cu = require("chrome").Cu;
var Services = Cu['import']("resource://gre/modules/Services.jsm", {});
expo(
Services
, ['Blob', 'FileReader']
);
expo(
Services.appShell && Services.appShell.hiddenDOMWindow
, ['Blob', 'FileReader']
);
// IndexedDB
expo(require('sdk/indexed-db'));
} catch(err) {
console.log('error', err);
}
function expo(ctx, props) {
if ( !ctx ) return;
if ( !props ) props = Object.keys(ctx);
for(var i=props.length,p; i--;) {
p = props[i];
if ( ctx[p] != undefined && !(p in window) ) {
window[p] = ctx[p];
}
}
return ctx;
}
}(this));
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