带有动画和非固定大小的div展开/折叠

.slideDown {
  height:141px;
  transition:height 0.35s ease;
  overflow:hidden;
  position:relative;
}

在这个类中删除height属性，然后它将变成非固定大小

试试这个

   .slideDown.ng-hide {
  max-height: 0;
  transition: max-height 0.35s ease-out;
  overflow:hidden;
  position:relative;
}

.slideDown {
  max-height: 1000px;
 transition: max-height 0.35s ease;
  overflow:hidden;
  position:relative;
}