https://www.gksbelchatow.com/libs/js/img.js

1
2var imgSizer = {
3	Config : {
4		imgCache : []
5		,spacer : "graphic/loader.gif"
6	}
7
8	,collate : function(aScope) {
9		var isOldIE = (document.all && !window.opera && !window.XDomainRequest) ? 1 : 0;
10		if (isOldIE && document.getElementsByTagName) {
11			var c = imgSizer;
12			var imgCache = c.Config.imgCache;
13
14			var images = (aScope && aScope.length) ? aScope : document.getElementsByTagName("img");
15			for (var i = 0; i < images.length; i++) {
16				images[i].origWidth = images[i].offsetWidth;
17				images[i].origHeight = images[i].offsetHeight;
18
19				imgCache.push(images[i]);
20				c.ieAlpha(images[i]);
21				images[i].style.width = "100%";
22			}
23
24			if (imgCache.length) {
25				c.resize(function() {
26					for (var i = 0; i < imgCache.length; i++) {
27						var ratio = (imgCache[i].offsetWidth / imgCache[i].origWidth);
28						imgCache[i].style.height = (imgCache[i].origHeight * ratio) + "px";
29					}
30				});
31			}
32		}
33	}
34
35	,ieAlpha : function(img) {
36		var c = imgSizer;
37		if (img.oldSrc) {
38			img.src = img.oldSrc;
39		}
40		var src = img.src;
41		img.style.width = img.offsetWidth + "px";
42		img.style.height = img.offsetHeight + "px";
43		img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')"
44		img.oldSrc = src;
45		img.src = c.Config.spacer;
46	}
47
48	// Ghettomodified version of Simon Willison's addLoadEvent() -- http://simonwillison.net/2004/May/26/addLoadEvent/
49	,resize : function(func) {
50		var oldonresize = window.onresize;
51		if (typeof window.onresize != 'function') {
52			window.onresize = func;
53		} else {
54			window.onresize = function() {
55				if (oldonresize) {
56					oldonresize();
57				}
58				func();
59			}
60		}
61	}
62}
63
64addLoadEvent(function() {
65	imgSizer.collate();
66});
67
68function addLoadEvent(func) {
69	var oldonload = window.onload;
70	if (typeof window.onload != 'function') {
71		window.onload = func;
72	} else {
73		window.onload = function() {
74			if (oldonload) {
75				oldonload();
76			}
77			func();
78		}
79	}
80}