修正png在ie6底下顯示不正常 (需 x.gif檔)

PngFix.js

var pngfix = function (option) {
    if (true || navigator.platform == "Win32" && navigator.appName == "Microsoft Internet Explorer" && window.attachEvent) {
        if (!document.getElementsByClassName) {
            document.getElementsByClassName = function (classname) {
                var all = document.documentElement.all || document.all;
                var elem, list, ret = [];
                for (var i = 0; i < all.length; i++) {
                    elem = all[i];
                    if (elem.className != "") {
                        list = elem.className.split(' ');
                        for (var j = 0; j < list.length; j++) {
                            if (list[j] == classname) {
                                ret.push(elem);
                                break;
                            }
                        }
                    }
                }
                return ret;
            }
        }
        var target = (!!option && option.target) || [];
        var exception = (!!option && option.exception) || [];

        var checkskip = function (obj, arr) {
            var skip = false;
            var arr_class = [], arr_id = [], arr_tag = [];
            for (var i = 0; i < arr.length; i++) {
                var ex = arr[i];
                if (ex.substr(0, 1) == "#") {
                    arr_id.push(ex.substr(1));
                } else if (ex.substr(0, 1) == ".") {
                    arr_class.push(ex.substr(1));
                } else {
                    arr_tag.push(ex);
                }
            };
            if (obj.className != "") {
                var classList = obj.className.split(' ');
                for (var j = 0; j < classList.length; j++) {
                    for (k = 0; k < arr_class.length; k++) {
                        if (arr_class[k] == classList[j]) {
                            skip = true;
                            break;
                        }
                    }
                    if (skip) break;
                }
            }
            if (obj.id != "") {
                for (var k = 0; k < arr_id.length; k++) {
                    if (arr_id[k] == obj.id) {
                        skip = true;
                        break;
                    }
                }
            }
            if (arr_tag.length) {
                for (var k = 0; k < arr_tag.length; k++) {
                    if (arr_tag[k] == obj.tagName) {
                        skip = true;
                        break;
                    }
                }
            }
            return skip;
        };
        var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');
        if (true || rslt != null && Number(rslt[1]) >= 5.5 && Number(rslt[1]) <= 6) {
            var all = document.documentElement.all || document.all;
            var reg = /\s*(?:url\(\")?((([^:\/#@\?]+)?(?:\:\/\/)?[^\/#\?]*)?(([^#\?]*)?\/([^\.\/#\?]*))?(\.[^\.\/#\?\)\"]*)?)/;
            for (var i = 0; i < all.length; i++) {
                var obj = all[i],
                    bg = obj.currentStyle["background-image"],
                    offset, exec;

                if (target.length != 0 && !checkskip(obj, target)) {
                    continue;
                }
                if (checkskip(obj, exception)) {
                    continue;
                };
                if (obj.src) {
                    exec = reg.exec(obj.src);
                    if (exec[7] == ".png") {
                        obj.src = "images/x.gif";
                        obj.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + exec[1] + "', sizingMethod='crop')";
                        obj.style["background-position"] = offset || "";
                        obj.style.width = obj.width + "px";
                        obj.style.height = obj.height + "px";
                    }
                }
                if (bg != "none") {
                    exec = reg.exec(bg);
                    if (exec[7].toLowerCase() == ".png") {
                        offset = obj.style["background-position"];
                        if (obj.currentStyle.backgroundRepeat != "repeat-x") {
                            obj.style.backgroundImage = "url('images/x.gif')";
                            obj.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + exec[1] + "', sizingMethod='crop')";
                            obj.style["background-position"] = offset || "";
                        }
                    }
                }
            }
        }
    }
};