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javascript atan2() 计算X 轴到某一点的角度

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Release： 2016-06-01 09:54:43
Original
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atan2 方法返回由 X 轴到 (y,x) 点的角度（以弧度为单位）。

基本语法：

<code class="language-javascript">Math.atan2(y, x)</code>
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参数介绍

参数 描述
x 必需。描述笛卡儿 x 坐标的数值表达式。
y 必需。描述笛卡儿 y 坐标的数值表达式。

返回值

返回值在 -pi 和 pi 之间，表示提供的 (y,x) 点的角度。

注意：

  1. 这个函数的参数顺序，Y 坐标在 X 坐标之前传递。
  2. 函数中如果有一个参数的值为非数字，该函数将返回NaN

 

实例

<code class="language-javascript"><script type="text/javascript">
document.write(Math.atan2(0.50,0.50) + "<br />")
document.write(Math.atan2(-0.50,-0.50) + "<br />")
document.write(Math.atan2(5,5) + "<br />")
document.write(Math.atan2(10,20) + "<br />")
document.write(Math.atan2(-5,-5) + "<br />")
document.write(Math.atan2(-10,10) + "<br />")
document.write(Math.atan2("s","y") + "<br />")
</script></code>
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在线运行

运行结果：

<code class="language-javascript">0.7853981633974483
-2.356194490192345
0.7853981633974483
0.4636476090008061
-2.356194490192345
-0.7853981633974483
NaN</code>
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Related labels：
js angle
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