لطفا منتظر باشید ...
•
Table of Contents
•
Index
•
Reviews
•
Examples
•
Reader Reviews
•
Errata
JavaScript: The Definitive Guide, 4th Edition
By
David Flanagan
Publisher
: O'Reilly
Pub Date
: November 2001
ISBN
: 0-596-00048-0
Pages
: 936
Slots
: 1
This fourth edition of the definitive reference to
JavaScript, a scripting language that can be embedded
directly in web pages, covers the latest version of the
language, JavaScript 1.5, as supported by Netscape 6 and
Internet Explorer 6. The book also provides complete
coverage of the W3C DOM standard (Level 1 and Level 2),
while retaining material on the legacy Level 0 DOM for
backward compatibility.
Availability
JavaScript 1.0; JScript 1.0; ECMAScript v1
Synopsis
Math.atan2(y, x)Arguments
y
The Y-coordinate of the point.x
The X-coordinate of the point.
Returns
A value between -
and radians that specifies thecounterclockwise angle between the positive X-axis and the point
(x, y).
Description
The Math.atan2( ) function computes the arc
tangent of the ratio
y/x. The
y argument can be considered the
Y-coordinate (or "rise") of a point, and the
x argument can be considered the
X-coordinate (or "run") of the point. Note the unusual
order of the arguments to this function: the Y-coordinate is passed
before the X-coordinate.
