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JavaScript & HTML DOM Reference Manual

Overview

JavaScript Object

JavaScript Array Object JavaScript Boolean Object JavaScript Date Object JavaScript Math Object JavaScript Number Object JavaScript String Object JavaScript RegExp Object JavaScript Global properties / functions JavaScript Operator

Browser Object

Window Object Navigator Object Screen Object History Object Location Object

DOM Object

HTML DOM Document Object HTML DOM Element object HTML DOM Attribute object HTML DOM Event object

HTML Object

<a> <area> <audio> <base> <blockquote> <body> <button> <canvas> <col> <colgroup> <datalist> <del> <details> <dialog> <embed> <fieldset> <form> <iframe> <frameset > <img> <ins> <input> - button <input> - checkbox <input> - color <input> - date <input> - datetime <input> - datetime-local <input> - email <input> - file <input> - hidden <input> - image <input> - month <input> - number <input> - range <input> - password <input> - radio <input> - reset <input> - search <input> - submit <input> - text <input> - time <input> - url <input> - week <keygen> <link> <label> <legend> <li> <map> <menu> <menuItem> <meta> <meter> <object> <ol> <optgroup> <option> <param> <progress> <q> <script> <select> <source> <style> <table> <td> <th> <tr> <textarea> <title> <time> <track> <video>

JavaScript atan () method

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JavaScript Math Object

Examples

Returns a specified number of arctangent:

Math.atan(2);

Output:

1.1071487177940904

Definition and Usage

atan () method to value between -PI / 2 and PI / 2 radians to return the arc tangent of x.

Browser Support

All major browsers support atan () method

grammar

Math.atan( x )

Parameter Value

参数	描述
x	必需。必须是一个数值。

return value

类型	描述
Number	x 的反正切值。返回的值是 -PI/2 到 PI/2 之间的弧度值。

technical details

JavaScript version:	1.0

JavaScript Math Object

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Next: JavaScript asin () method