方法:
getX = (degrees) => {
let radians = degrees * (Math.PI / 180);
console.log((130 * (Math.cos(radians))) - 37.5);
}
getX(90);
输入:90度
预期产出:92.448
实际产量:-37.49999999999
发布于 2018-05-31 10:02:07
首先,你必须注意cos(90)= 0,所以当你写(130 * cos(90)) - 37.5)实际上会返回-37.5
为什么是因为(130 * cos(90))被首先计算。
要获得所需的结果,必须小心括号并更改为console.log(130+(Math.cos(radian)-37.5));
getX = (degrees) => {
let radians = degrees * (Math.PI / 180);
console.log(130 + (Math.cos(radians) - 37.5));
}
https://stackoverflow.com/questions/-100004634
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