while (prop = props.pop()) { (function (natural, prop) { $.fn[natural] = (natural in new Image()) ? function () { return this[0][natural]; } : function () { var node = this[0], img, value;
if (node.tagName.toLowerCase() === 'img') { img = new Image(); img.src = node.src, value = img[prop]; } return value; }; }('natural' + prop, prop.toLowerCase())); }
(function($){ var props = ['Width', 'Height'], prop;
while (prop = props.pop()) {
(function (natural, prop) {
$.fn[natural] = (natural in new Image()) ?
function () {
return this[0][natural];
} :
function () {
var
node = this[0],
img,
value;
if (node.tagName.toLowerCase() === 'img') {
img = new Image();
img.src = node.src,
value = img[prop];
}
return value;
};
}('natural' + prop, prop.toLowerCase()));
}
}(jQuery));
// 如何使用: var nWidth = $('img#example').naturalWidth(), nHeight = $('img#example').naturalHeight();