Definition and Usage
定义与用法

The sin() method returns the sine of a number.
利用sin()方法可以返回数字的正弦值

Syntax
语法

Math.sin(x)

Tips and Notes
提示与注意点

Note: The sin() method returns a numeric value between -1 and 1, which represents the sine of the parameter x.
注意：sin()方法返回的数字值范围在-1到1之间，这个值代表了参数x的正弦值。

Example
举例

In the following example we will return the sine of different numbers:
举例中我们将返回不同值的正弦值：

<script type="text/javascript">

document.write(Math.sin(3) + "<br />")
document.write(Math.sin(-3) + "<br />")
document.write(Math.sin(0) + "<br />")
document.write(Math.sin(Math.PI) + "<br />")
document.write(Math.sin(Math.PI/2))

</script>

The output of the code above will be:
输出结果为：

0.1411200080598672
-0.1411200080598672
0
1.2246063538223772e-16
1

Try-It-Yourself Demos
尝试与演示

sin()
How to use sin() to get the sine of some numbers.
怎样使用sin()来得到一些数字的正弦值

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