002基本数学运算.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
		<script>
			var num = 100;
			var username = "ÒüÌÎ";
			var b = NaN==NaN;  //0000 0001
			var c; //undefined
			var d = new Object();
			var e = function(){};
			
			/*
			document.write( typeof num + "<br>");
			
			document.write( typeof username + "<br>");
			
			document.write( typeof b + "<br>" );
			
			document.write(  typeof c + "<br>"   );
			
			document.write(  typeof d + "<br>");
			
			document.write(  typeof e + "<br>");
			*/
			
			
			var res = num + c;
			
			document.write(  res  );
			
			document.write(  80*"abc"  );
			
			document.write( num + b  ); //100
			
			document.write( +"123" + 77  );
			
		</script>
    </head>
    <body>	
    </body>
</html>