我正在使用新的FireFox Addons SDK来开发一个扩展程序。我有一个小部件,附带了一个面板。该面板用于控制首选项,因此我需要从面板的内容脚本中访问simple-storage API。我知道你不能直接访问API,所以我尝试使用消息传递。下面是我的代码:
exports.main = function() {
var panel = require('panel');
var ss = require('simple-storage');
var prefPanel = panel.Panel({
contentURL: self.data.url('prefPanel.html'),
contentScriptFile: self.data.url('prefPanel.js'),
contentScriptWhen: 'ready',
onMessage: function(message) {
switch(message.method) {
case 'setValue':
ss.storage[message.key] = message.value;
}
},
});
prefPanel.postMessage(ss.storage);
require('widget').Widget({
id: 'ml-pref-button',
content: 'ML',
width: 30,
panel: prefPanel,
})
}
在prefPanel.js中我有以下内容:
self.on('message', function(storage) {
storage.setValue = function(key, value) {
this[key] = value;
self.postMessage({
method: 'setValue',
'key': key,
'value': value,
});
}
// Do some stuff, using storage object
});
问题是,我遇到了这个错误:
Error: An exception occurred.
Traceback (most recent call last):
File "resource://jid0-wdemwzahwzh3bsw0kkxlcjg9e7k-at-jetpack-api-utils-lib/content/worker.js", line 405, in postMessage
throw new Error(ERR_DESTROYED);
Error: The page has been destroyed and can no longer be used.
我猜这是因为 prefPanel DOM 和内容脚本还没有加载。当面板显示时,DOM 和内容脚本是否重新加载,或者它们一直在后台运行?