JavaScript获取图片(Image)的大小(宽度,高度)

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如果只有图片的URL

function getImageDimensions(imgStyleRule) {
  var defaultSize, img;
  defaultSize = {
    width: 10,
    height: 30
  };
  if (!imgStyleRule || !imgStyleRule.style || !imgStyleRule.style.backgroundImage) {
    return defaultSize;
  }
  img = new Image();
  img.src = imgStyleRule.style.backgroundImage.replace(/url\(|\)$|"/ig, '');
  return {
    width: img.width,
    height: img.height
  };
}

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如何获取imgStyleRule, 参考
http://darrenzhu.iteye.com/admin/blogs/2065946


如果图片已经加载,可以通过如下方式获取

var img = document.getElementById('imageid'); 
//or however you get a handle to the IMG
var width = img.clientWidth;
var height = img.clientHeight;

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