<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script> /* function abs(x) { if (x > 0) { return x; } else { return -x; } } alert(abs(-3)); */ alert(Math.abs(-3)); </script> </head> <body> </body> </html>