/* 常用对象 */
//构造函数
var ImageHelper = function() {}ImageHelper.prototype = {//根据让IE6的png图片背景变成透明(注意引用后可能会使图片布局改变)fixPNG: function(imgObj) {//<span style="display:inline-block; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='PNG图片的URL',sizingMethod='scale');width:span的宽即图片宽;height:span的高即图片高;"></span>var arVersion = navigator.appVersion.split("MSIE");var version = parseFloat(arVersion[1]);if ((version >= 5.5) && (version < 7) && (document.body.filters)) {var imgID = (imgObj.id) ? "id='" + imgObj.id + "' " : "";var imgClass = (imgObj.className) ? "class='" + imgObj.className + "' " : "";var imgTitle = (imgObj.title) ? "title='" + imgObj.title + "' " : "title='" + imgObj.alt + "' ";var imgStyle = "display:inline-block;" + imgObj.style.cssText;var strNewHTML = "<span " + imgID + imgClass + imgTitle + " style=\"" + "width:" + imgObj.width + "px; height:" + imgObj.height + "px;" + imgStyle + ";" + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader" + "(src=\'" + imgObj.src + "\', sizingMethod='scale');\"></span>";imgObj.outerHTML = strNewHTML;}},//让所有IE6下的所有PNG图片背景透明(注意引用后可能会使图片布局改变)correctPNG: function() {var arVersion = navigator.appVersion.split("MSIE");var version = parseFloat(arVersion[1]);if ((version >= 5.5) && (version < 7) && (document.body.filters)) {for (var j = 0; j < document.images.length; j++) {var img = document.images[j];var imgName = img.src.toUpperCase();if (imgName.substring(imgName.length - 3, imgName.length) == "PNG") {var imgID = (img.id) ? "id='" + img.id + "' " : "";var imgClass = (img.className) ? "class='" + img.className + "' " : "";var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' ";var imgStyle = "display:inline-block;" + img.style.cssText;var strNewHTML = "<span " + imgID + imgClass + imgTitle + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";" + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader" + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>"img.outerHTML = strNewHTMLj = j - 1;}}}},/*** 自动缩放图片尺寸* ImgSource图片源(如URL)* ImgWidth要缩放的宽* ImgHeight要缩放的高* ImgToFit当图长宽都小于显示值时是否拉伸(true拉伸或false不拉伸)* 使用方法：原图的宽高最好也要写成缩放的大小<img src="***.jpg" width="180" height="110" οnlοad="javascript:__Image__.drawImage(this,180,110,true);">*/drawImage: function(ImgSource, ImgWidth, ImgHeight, ImgToFit) {var image = new Image();image.src = ImgSource.src;if (image.width > 0 && image.height > 0) {if ((image.width / image.height) >= (ImgWidth / ImgHeight)) {if ((image.width > ImgWidth) || (image.width < ImgWidth && ImgToFit)) {ImgSource.width = ImgWidth;ImgSource.height = (image.height * ImgWidth) / image.width;}} else {if ((image.height > ImgHeight) || ((image.height < ImgHeight) && ImgToFit)) {ImgSource.height = ImgHeight;ImgSource.width = parseInt((image.width * ImgHeight) / image.height);}}}}
}
var __Image__ = new ImageHelper(); //默认生成一个对象