Page 77 - DCAP202_Fundamentals of Web Programming
P. 77
Fundamentals of Web Programming
Notes Strings are called constants or literals. The string value “hello” is called a string constant or
literal. To change a string requires replacing it with another string.
Strings can contain escape sequences (a single character preceded with a backslash), as shown in
Table 6.2. Escape sequences are a mechanism for quoting a single character.
Table 6.2: Escape Sequences
Escape Sequence What It Represents
\' Single quotation mark
\" Double quotation mark
\t Tab
\n Newline
\r Return
\f Form feed
\b Backspace
\e Escape
\\ Backslash
Special Escape Sequences
\XXX The character with the Latin-1 encoding specified by up to three
octal digits XXX between 0 and 377. \251 is the octal sequence for
the copyright symbol.
\xXX The character with the Latin-1 encoding specified by the two
hexadecimal digits XX between 00 and FF. \xA9 is the
hexadecimal sequence for the copyright symbol.
\uXXXX The Unicode character specified by the four hexadecimal digits
XXXX. \u00A9 is the Unicode sequence for the copyright symbol.
Example: Illustrating strings in java script
<html>
<head>
<body>
<pre>
<font size=”+2">
<script language=”JavaScript”>
<!— Hide script from old browsers.
document.write(“\t\tHello\nworld!\n”);
document.writeln(“\”Nice day, Mate.\”\n”);
document.writeln(‘Smiley face:<font size=”+3"> \u263a\n’);
//End hiding here. —>
</script>
</pre>
</body>
</html>
Output
Hello
70 LOVELY PROFESSIONAL UNIVERSITY
