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Problem with Javascript encodeURI in Chrome extension

I have the following Javascript Code in my Chrome extension:

console.log("title: "+title);
console.log("body: "+body);
var s = encodeURI(title);
console.log("s: "+s);

The URL that the extension processes is: http://de.wikipedia.org/wiki/Robert_Louis_Stevenson
title is tab.title from the active tab.

The console output is:

title: Robert Louis Stevenson – Wikipedia
body: http://de.wikipedia.org/wiki/Robert_Louis_Stevenson
s: Robert%20Louis%20Stevenson%20%E2%80%93%20Wikipedia

My question is, why is the minus char "-" converted to %E2%80%93 in this case? What does this mean?

If I try the same code on a different URL, for example the same Wikipedia page in English instead of German: http://en.wikipedia.org/wiki/Robert_Louis_Stevenson

the output is like this:

title: Robert Louis Stevenson - Wikipedia, the free encyclopedia
body: http://en.wikipedia.org/wiki/Robert_Louis_Stevenson
s: Robert%20Louis%20Stevenson%20-%20Wikipedia,%20the%20free%20encyclopedia

This time the minus char "-" is not converted at all.

I guess it may have something to do with a Unicode convertion, but both these pages are encoded with UTF-8 according to the page sources.

So all in all I want to know the exact meaning why a minus char is converted to E2%80%93% in encodeURI().
1 Solution
In this case the - is no minus it's a long minuns (e.g in word the char you get if you type three -, or in html it's the entitiy –)
dMaAuthor Commented:
What is the difference between – and the ASCII - (code 45)? Why is it displayed as %E2%80%93, due to what convention?
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