The toLocaleString() method is by definition implementation-dependent: it uses the implementation locale, such as browser locale. So if I were looking at your page that uses the method, I would see numbers formatted according to Finnish or English locale, depending on which browser I’m using.
What you want is localization by the locale of the page, and for this you need something else. In simple cases you might code it yourself, but number formatting is in general complicated, making it reasonable to use a library, such as Globalize. Check out the compact source of a simple demo. In Globalize, you use standard language codes when specifying the locale.
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
