获取图片原始大小

工作中遇到要获取图片的原始大小做展示切换
总结方法，以便后续查看

<script>
var OriginImage = new Image();
function GetImageWidth(oImage)
{
  if (OriginImage.src != oImage.src) 
    OriginImage.src = oImage.src;
    return OriginImage.width;
}
function GetImageHeight(oImage)
{
  if (OriginImage.src != oImage.src)
    OriginImage.src = oImage.src;
    return OriginImage.height;
}