目前在開發中遇到一個問題： 需要獲取一個設備移動的角度。 通過設備移動的時候可以獲得一組數據：{"ret":true,"batt":100,"temp":20,"gsensor":1,"x":8,"y":-2,"z":258} {"ret":true,"batt":100,"temp":20,"gsensor":1,"x":8,"y":-2,"z":257} {"ret":true,"batt":100,"temp":20,"gsensor":1,"x":6,"y":-3,"z":258} {"ret":true,"batt":100,"temp":20,"gsensor":1,"x":10,"y":-3,"z":259} {"ret":true,"batt":100,"temp":20,"gsensor":1,"x":7,"y":-4,"z":257} {"ret":true,"batt":100,"temp":20,"gsensor":1,"x":-245,"y":35,"z":-10} {"ret":true,"batt":100,"temp":20,"gsensor":1,"x":-244,"y":34,"z":-11} {"ret":true,"batt":100,"temp":20,"gsensor":1,"x":-243,"y":34,"z":-12} {"ret":true,"batt":100,"temp":20,"gsensor":1,"x":-244,"y":35,"z":-10}其中gsensor的xyz三個數據可以通過設備得出。 現在廠商提供給我們了幾個公式：其中，g是重力加速度。如何使用JS或者PHP來根據獲取到的x,y,z三個值來獲取θ和ψ兩個角度值？或者如何根據公式最后一條來計算ψ? 使用JS或者PHP該如何實現？