获得div正面临的方向

Question

我有旋转div的代码，我想知道它面向哪个方向。
我如何找到div面向的方向？

function getDirectionX(elem){
    lcelement = document.getElementById(elem);
    // find direction lcelement is facing here
    // return x;
}
function getDirectionY(elem){
    lcelement = document.getElementById(elem);
    // find direction lcelement is facing here
    // return y;
}

Answer 1

这有帮助吗？

https://jsfiddle.net/m3130qo8/1/

代码：

function spinit(){
    var woah = document.getElementById('woah');
    var deg = Math.floor(Math.random() * 360) + 0;
    woah.style.webkitTransform = 'rotate('+deg+'deg)'; 
    woah.style.mozTransform    = 'rotate('+deg+'deg)'; 
    woah.style.msTransform     = 'rotate('+deg+'deg)'; 
    woah.style.oTransform      = 'rotate('+deg+'deg)'; 
    woah.style.transform       = 'rotate('+deg+'deg)'; 

    var current_rotation = /[0-9]+/.exec(woah.style.transform);
    document.getElementById('woah').innerHTML=current_rotation;
}