锘?/ jQuery.autoIMG.js - 2010-04-02 - Tang Bin - http://planeArt.cn/ - MIT Licensed
(function ($) {
		// 妫€娴嬫槸鍚︽敮鎸乧ss2.1 max-width灞炴€
	var isMaxWidth = 'maxWidth' in document.documentElement.style,
		// 妫€娴嬫槸鍚E7娴忚鍣
		isIE7 = !-[1,] && !('prototype' in Image) && isMaxWidth;
	
	$.fn.autoIMG = function () {
		var maxWidth = this.width();
		
		return this.find('img').each(function (i, img) {
			// 闆ㄥ摬 娣诲姞鍥剧墖閾炬帴锛屽厛鍒ゆ柇鍘熷浘鏄惁甯﹂摼鎺ワ紝濡傛灉甯﹂摼鎺ュ垯涓嶉噸澶嶆坊鍔
			if(jQuery(this).parent().prop("tagName") != 'A'){
				img.onclick = function(){window.open(img.src)};
				img.title="鐐瑰嚮鏌ョ湅澶у浘"
				img.style.cursor = 'pointer';
			}

			if (img.style.width) return;	//鎺掗櫎浜嗗湪鍐呭涓洿鎺ヨ缃簡鍥剧墖澶у皬鐨勬儏鍐
			// 濡傛灉鏀寔max-width灞炴€у垯浣跨敤姝わ紝鍚﹀垯浣跨敤涓嬮潰鏂瑰紡锛屽浘鐗囧睘鎬т腑鍔犱簡height鏃跺鑷撮珮搴﹁鍥哄畾鑰屽彉褰
			//if (isMaxWidth) return img.style.maxWidth = maxWidth + 'px';
			var src = img.src;
			
			// 闅愯棌鍘熷浘
			img.style.display = 'none';
			img.removeAttribute('src');
			
			// 鑾峰彇鍥剧墖澶村昂瀵告暟鎹悗绔嬪嵆璋冩暣鍥剧墖
			imgReady(src, function (width, height) {
				// 绛夋瘮渚嬬缉灏
				if (width > maxWidth) {
					height = maxWidth / width * height,
					width = maxWidth;
					img.style.width = width + 'px';
					img.style.height = height + 'px';
				};
				// 鏄剧ず鍘熷浘
				img.style.display = '';
				img.setAttribute('src', src);
			});
			
		});
	};
	
	// IE7缂╂斁鍥剧墖浼氬け鐪燂紝閲囩敤绉佹湁灞炴€ч€氳繃涓夋鎻掑€艰В鍐
	isIE7 && (function (c,d,s) {s=d.createElement('style');d.getElementsByTagName('head')[0].appendChild(s);s.styleSheet&&(s.styleSheet.cssText+=c)||s.appendChild(d.createTextNode(c))})('img {-ms-interpolation-mode:bicubic}',document);

	/**
	 * 鍥剧墖澶存暟鎹姞杞藉氨缁簨浠
	 * @see		http://www.planeart.cn/?p=1121
	 * @param	{String}	鍥剧墖璺緞
	 * @param	{Function}	灏哄灏辩华 (鍙傛暟1鎺ユ敹width; 鍙傛暟2鎺ユ敹height)
	 * @param	{Function}	鍔犺浇瀹屾瘯 (鍙€? 鍙傛暟1鎺ユ敹width; 鍙傛暟2鎺ユ敹height)
	 * @param	{Function}	鍔犺浇閿欒 (鍙€?
	 */
	var imgReady = (function () {
		var list = [], intervalId = null,

		// 鐢ㄦ潵鎵ц闃熷垪
		tick = function () {
			var i = 0;
			for (; i < list.length; i++) {
				list[i].end ? list.splice(i--, 1) : list[i]();
			};
			!list.length && stop();
		},

		// 鍋滄鎵€鏈夊畾鏃跺櫒闃熷垪
		stop = function () {
			clearInterval(intervalId);
			intervalId = null;
		};

		return function (url, ready, load, error) {
			var check, width, height, newWidth, newHeight,
				img = new Image();
			
			img.src = url;

			// 濡傛灉鍥剧墖琚紦瀛橈紝鍒欑洿鎺ヨ繑鍥炵紦瀛樻暟鎹
			if (img.complete) {
				ready(img.width, img.height);
				load && load(img.width, img.height);
				return;
			};
			
			// 妫€娴嬪浘鐗囧ぇ灏忕殑鏀瑰彉
			width = img.width;
			height = img.height;
			check = function () {
				newWidth = img.width;
				newHeight = img.height;
				if (newWidth !== width || newHeight !== height ||
					// 濡傛灉鍥剧墖宸茬粡鍦ㄥ叾浠栧湴鏂瑰姞杞藉彲浣跨敤闈㈢Н妫€娴
					newWidth * newHeight > 1024
				) {
					ready(newWidth, newHeight);
					check.end = true;
				};
			};
			check();
			
			// 鍔犺浇閿欒鍚庣殑浜嬩欢
			img.onerror = function () {
				error && error();
				check.end = true;
				img = img.onload = img.onerror = null;
			};
			
			// 瀹屽叏鍔犺浇瀹屾瘯鐨勪簨浠
			img.onload = function () {
				load && load(img.width, img.height);
				!check.end && check();
				// IE gif鍔ㄧ敾浼氬惊鐜墽琛宱nload锛岀疆绌簅nload鍗冲彲
				img = img.onload = img.onerror = null;
			};

			// 鍔犲叆闃熷垪涓畾鏈熸墽琛
			if (!check.end) {
				list.push(check);
				// 鏃犺浣曟椂鍙厑璁稿嚭鐜颁竴涓畾鏃跺櫒锛屽噺灏戞祻瑙堝櫒鎬ц兘鎹熻€
				if (intervalId === null) intervalId = setInterval(tick, 40);
			};
		};
	})();

})(jQuery);