I've read this question about javascript trim, with a regex answer.
Then I expect trim to remove the inner space between Hello and World.
function myFunction() {
alert("Hello World ".trim());
}
EDITED
Why I expected that!?
Nonsense! Obviously trim doesn't remove inner spaces!, only leading and trailing ones, that's how trim works, then this was a very wrong question, my apologies.
For space-character removal use
"hello world".replace(/\s/g, "");
for all white space use the suggestion by Rocket in the comments below!