Math.sin() - JavaScript 编辑

The Math.sin() function returns the sine of a number.

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The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Syntax

Math.sin(x)

Parameters

x

A number (given in radians).

Return value

The sine of the given number.

Description

The Math.sin() method returns a numeric value between -1 and 1, which represents the sine of the angle given in radians.

Because sin() is a static method of Math, you always use it as Math.sin(), rather than as a method of a Math object you created (Math is not a constructor).

Examples

Using Math.sin()

Math.sin(0);           // 0
Math.sin(1);           // 0.8414709848078965

Math.sin(Math.PI / 2); // 1

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'Math.sin' in that specification.

Browser compatibility

BCD tables only load in the browser

See also

• Math.acos()
• Math.asin()
• Math.atan()
• Math.atan2()
• Math.cos()
• Math.tan()