Chapter: Internet & World Wide Web HOW TO PROGRAM - The Ajax Client - JavaScript: Objects
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Math Object - JavaScript(Js)
Math Object
The Math object’s methods allow you to perform many
common mathematical calculations. As shown previously, an object’s methods are
called by writing the name of the ob-ject followed by a dot (.) and the name of the method. In parentheses
following the method name is the argument (or a comma-separated list of
arguments) to the method. For example, to calculate and display the square root
of 900.0
you might write
document.writeln(
Math.sqrt( 900.0 ) );
which calls method Math.sqrt to calculate the square root of the number
contained in the parentheses (900.0),
then outputs the result. The number 900.0 is the argument of the Math.sqrt
method. The preceding statement would display
30.0. Some Math object methods are summarized in Fig. 11.1.
The Math object defines several commonly used
mathematical constants, summarized in Fig. 11.2. [Note: By convention, the names of constants are written in all
uppercase let-ters so they stand out in a program.]
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