Math.atan2 Function
Returns the angle (in radians) from the X axis to a point (y,x).
语法
Math.atan2(y, x)
参数
x
必要参数。A numeric expression representing the cartesian x-coordinate.
y
必要参数。A numeric expression representing the cartesian y-coordinate.
备注
The return value is between -pi and pi. It represents the angle of the supplied (y,x) point, in radians.
Applies To: Math Object
必备条件
在以下文档模式中受支持:怪异模式、Internet Explorer 6标准模式、Internet Explorer 7标准模式、Internet Explorer 8标准模式、Internet Explorer 9标准模式、Internet Explorer 10标准模式、Internet Explorer 11标准模式。应用商店应用(Windows 8和Windows Phone 8.1)中也受支持。请参阅版本信息。