Firefox 插件的奇怪行为
我有一个首选项条目并使用下面的语句来访问它的内容，
var st = easyfa.branch.getComplexValue("mapstr",Components.interfaces.nsIPrefLocalizedString).data;
这会引发异常：
*Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsIPrefBranch.getComplexValue]*
但是在手动设置首选项的值（通过输入 about:config）后，错误消失了！？
I have a preference entry and use below statement to access it's content
var st = easyfa.branch.getComplexValue("mapstr",Components.interfaces.nsIPrefLocalizedString).data;
this throws exception:
*Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsIPrefBranch.getComplexValue]*
But after setting value of the preference manually (by entering about:config) the error disappears!?
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本地化首选项的默认值必须是
.properties文件的 chrome URL，在该文件中查找首选项以找到结果字符串。假设 URL 指向区域设置文件，则该值可以根据安装的语言进行更改。然而，您似乎想要一个简单的字符串首选项，您应该使用 nsISupportsString 接口来检索它。
The default value of a localised preference must be a chrome URL to a
.propertiesfile, in which the preference is looked up to locate the resulting string. Assuming the URL points to a locale file, this allows the value to change depending on the installed language.However you seem to want a simple string preference, which you should retrieve using the
nsISupportsStringinterface.获取未设置的首选项的值总是会抛出异常。您必须将其包装在 try-catch 块中并进行相应的处理。
Getting the value of a preference that isn't set will always throw. You have to wrap it in a
try-catchblock and handle it accordingly.