Errata

Lines 3-4 of the first sample script in section 1.8 now reads:

"...
for (i=0, j=1, k=0, fib =0; i<50; i++, fib=j+k, k=fib){
document.write ( "Fibonacci (" + i + ") = " + fib);
..."

http://developer.netscape.com/software/jsdebug.html

Changed the end of the first sentence from:

"... that do not begin with the digit zero, or as the digit zero by itself."

to:

"... that do not begin with the digit zero, except that the digit zero by
itself is a Base-10 integer that represents zero."

Changed the meaning for Number.MIN_VALUE to:

"Smallest (closest to zero) representable value"

The third example line of code read:

Result is 12.

It now reads:

Result is "12".

The 3rd line of code used to read:

"1" + 2 // Concatenation; 2 is converted to "2". Result is 12.

It now reads:

"1" + 2 // Concatenation; 2 is converted to "2". Result is "12".

The bitwise operators require numeric arguments. They internally
coerce these numbers from their default floating-point representation
into a 32-bit integer representation. With Navigator 2 and 3, if
the operands do not fit in a 32-bit integer representation, the
operators return NaN. In ECMAScript and JavaScript 1.2, however,
these operators simply coerce their operands to 32-bit integers,
even if it results in lost data.

Added a ; to the end of line 3 to read:

if (!username) username = "John Doe";

Added a colon to the end of the third line, so that it reads:

case "hello":

email: homer@simpsons.com
now reads:
email: "homer@simpsons.com"

Changed the last sentence from:

For example, use $ instead of 44.

to:
For example, use 44 instead of 44.

open()
Open a new window.

Changed the line from:

<INPUT TYPE=button VALUE="Stop"
to:
<INPUT TYPE="button" VALUE="Stop"

The "self = null;" line of code was removed and replaced with:

var err = no_such_property; // Error: "no_such_property is not defined"

did read:
document.b1.onclick = ...
now reads:
document.forms[0].b1.onclick = ...

"this.layer.top"

"this.style.pixelTop"

Changed "acme.com" to ".acme.com"

In "Arguments", changed "the empty string" to "a comma"
in the last sentence.

Change second line to:

document.write('Today is: ' + d.toLocaleString()); // and print it out.

In "Description," added the following to the end of the
2nd paragraph:

Note that if you pass an object to eval(), it converts the object
to a string primitive and returns that string without evaluating it.
Thus, if you pass a String object rather than a primitive string value,
eval() does not evaluate the string as you might expect.

On this page, the author discusses the "form.action" property. I have found
through testing that for the POST method of form submission to work, the
"form.method" property must also be explicitly set, even if it is set within
the original <FORM> tag. There seems to be no problem if the form uses the
GET method, but when I tried a "POST", all I got were 405 errors in both
Netscape (4.6) & IE (4.01).

Setting the "method" property explicitly eliminated the problem.

Changed from:

Synopsis
Math.atan2(x, y)

Arguments
x The X-coordinate of the point.
y The Y-coordinate of the point.

to:

Synopsis
Math.atan2(y, x)

Arguments
y The Y-coordinate of the point.
x The X-coordinate of the point.

Added this paragraph to the end of the "Description" section:

Note the unusual order of the arguments to this function. The
Y-coordinate (the "rise") is passed before the X-coordinate
(the "run").

The line 10 from bottom of page now reads:

document.write(navigator.plugins["Shockwave"] ?

Ie, replace the () brackets with [] around the word "Shockwave".

Specified /s+/ with a lower-case 's', as in the example on the following
page.

string.substr(start, length)

("substr" is in constant-width font, and "string", "start", and
"length" are all in constant-width italic font.)

Deleted the code line that read:

[ WRAP=off|virtual|physical ] How word wrapping is handled

INDEX:.
Changed the entry for alert() from:

alert(), 9, 22, 231-233, 709

to:

alert(), 9-10, 22, 231-233, 709