hoandang

function getRotationAngle(target) 
{
  const obj = window.getComputedStyle(target, null);
  const matrix = obj.getPropertyValue('-webkit-transform') || 
    obj.getPropertyValue('-moz-transform') ||
    obj.getPropertyValue('-ms-transform') ||
    obj.getPropertyValue('-o-transform') ||
    obj.getPropertyValue('transform');

  let angle = 0;