ie6下png透明

ie6下png透明是前端的障碍！很多时候都很让人头疼，网上什么解决ie6透明的办法非常多，但是没有一个真正解决的很好的，很多都是那种要么不能用，要么ie6下png透明过后图片变形，让人头疼的很！以下我在国外站点上找到的，忘记是哪个网站了，效果非常好，下面是代码：

先说调用方法：

<!--[if IE 6]>    <script type="text/javascript">       EvPNG.fix('div, ul, img, li, input');    </script><![endif]-->

EvPNG.fix('包含透明PNG图片的标签'); 多个标签之间用英文逗号隔开。

 

ie6下png透明代码：

var EvPNG = {    ns: 'EvPNG',    imgSize: {},    createVmlNameSpace: function() {        if (document.namespaces && !document.namespaces[this.ns]) {            document.namespaces.add(this.ns, 'urn:schemas-microsoft-com:vml')        }        if (window.attachEvent) {            window.attachEvent('onbeforeunload',             function() {                EvPNG = null            })        }    },    createVmlStyleSheet: function() {        var a = document.createElement('style');        document.documentElement.firstChild.insertBefore(a, document.documentElement.firstChild.firstChild);        var b = a.styleSheet;        b.addRule(this.ns + '\\:*', '{behavior:url(#default#VML)}');        b.addRule(this.ns + '\\:shape', 'position:absolute;');        b.addRule('img.' + this.ns + '_sizeFinder', 'behavior:none; border:none; position:absolute; z-index:-1; top:-10000px; visibility:hidden;');        this.styleSheet = b    },    readPropertyChange: function() {        var a = event.srcElement;        if (event.propertyName.search('background') != -1 || event.propertyName.search('border') != -1) {            EvPNG.applyVML(a)        }        if (event.propertyName == 'style.display') {            var b = (a.currentStyle.display == 'none') ? 'none': 'block';            for (var v in a.vml) {                a.vml[v].shape.style.display = b            }        }        if (event.propertyName.search('filter') != -1) {            EvPNG.vmlOpacity(a)        }    },    vmlOpacity: function(a) {        if (a.currentStyle.filter.search('lpha') != -1) {            var b = a.currentStyle.filter;            b = parseInt(b.substring(b.lastIndexOf('=') + 1, b.lastIndexOf(')')), 10) / 100;            a.vml.color.shape.style.filter = a.currentStyle.filter;            a.vml.image.fill.opacity = b        }    },    handlePseudoHover: function(a) {        setTimeout(function() {            EvPNG.applyVML(a)        },        1)    },    fix: function(a) {        var b = a.split(',');        for (var i = 0; i < b.length; i++) {            this.styleSheet.addRule(b[i], 'behavior:expression(EvPNG.fixPng(this))')        }    },    applyVML: function(a) {        a.runtimeStyle.cssText = '';        this.vmlFill(a);        this.vmlOffsets(a);        this.vmlOpacity(a);        if (a.isImg) {            this.copyImageBorders(a)        }    },    attachHandlers: function(b) {        var c = this;        var d = {            resize: 'vmlOffsets',            move: 'vmlOffsets'        };        if (b.nodeName == 'A') {            var e = {                mouseleave: 'handlePseudoHover',                mouseenter: 'handlePseudoHover',                focus: 'handlePseudoHover',                blur: 'handlePseudoHover'            };            for (var a in e) {                d[a] = e[a]            }        }        for (var h in d) {            b.attachEvent('on' + h,             function() {                c[d[h]](b)            })        }        b.attachEvent('onpropertychange', this.readPropertyChange)    },    giveLayout: function(a) {        a.style.zoom = 1;        if (a.currentStyle.position == 'static') {            a.style.position = 'relative'        }    },    copyImageBorders: function(a) {        var b = {            'borderStyle': true,            'borderWidth': true,            'borderColor': true        };        for (var s in b) {            a.vml.color.shape.style[s] = a.currentStyle[s]        }    },    vmlFill: function(a) {        if (!a.currentStyle) {            return        } else {            var b = a.currentStyle        }        for (var v in a.vml) {            a.vml[v].shape.style.zIndex = b.zIndex        }        a.runtimeStyle.backgroundColor = '';        a.runtimeStyle.backgroundImage = '';        var c = (b.backgroundColor == 'transparent');        var d = true;        if (b.backgroundImage != 'none' || a.isImg) {            if (!a.isImg) {                a.vmlBg = b.backgroundImage;                a.vmlBg = a.vmlBg.substr(5, a.vmlBg.lastIndexOf('")') - 5)            } else {                a.vmlBg = a.src            }            var e = this;            if (!e.imgSize[a.vmlBg]) {                var f = document.createElement('img');                e.imgSize[a.vmlBg] = f;                f.className = e.ns + '_sizeFinder';                f.runtimeStyle.cssText = 'behavior:none; position:absolute; left:-10000px; top:-10000px; border:none;';                f.attachEvent('onload',                 function() {                    this.width = this.offsetWidth;                    this.height = this.offsetHeight;                    e.vmlOffsets(a)                });                f.src = a.vmlBg;                f.removeAttribute('width');                f.removeAttribute('height');                document.body.insertBefore(f, document.body.firstChild)            }            a.vml.image.fill.src = a.vmlBg;            d = false        }        a.vml.image.fill.on = !d;        a.vml.image.fill.color = 'none';        a.vml.color.shape.style.backgroundColor = b.backgroundColor;        a.runtimeStyle.backgroundImage = 'none';        a.runtimeStyle.backgroundColor = 'transparent'    },    vmlOffsets: function(e) {        var f = e.currentStyle;        var g = {            'W': e.clientWidth + 1,            'H': e.clientHeight + 1,            'w': this.imgSize[e.vmlBg].width,            'h': this.imgSize[e.vmlBg].height,            'L': e.offsetLeft,            'T': e.offsetTop,            'bLW': e.clientLeft,            'bTW': e.clientTop        };        var i = (g.L + g.bLW == 1) ? 1: 0;        var j = function(a, l, t, w, h, o) {            a.coordsize = w + ',' + h;            a.coordorigin = o + ',' + o;            a.path = 'm0,0l' + w + ',0l' + w + ',' + h + 'l0,' + h + ' xe';            a.style.width = w + 'px';            a.style.height = h + 'px';            a.style.left = l + 'px';            a.style.top = t + 'px'        };        j(e.vml.color.shape, (g.L + (e.isImg ? 0: g.bLW)), (g.T + (e.isImg ? 0: g.bTW)), (g.W - 1), (g.H - 1), 0);        j(e.vml.image.shape, (g.L + g.bLW), (g.T + g.bTW), (g.W), (g.H), 1);        var k = {            'X': 0,            'Y': 0        };        var m = function(a, b) {            var c = true;            switch (b) {                case 'left':            case 'top':                k[a] = 0;                break;                case 'center':                k[a] = .5;                break;                case 'right':            case 'bottom':                k[a] = 1;                break;                default:                if (b.search('%') != -1) {                    k[a] = parseInt(b) * .01                } else {                    c = false                }            }            var d = (a == 'X');            k[a] = Math.ceil(c ? ((g[d ? 'W': 'H'] * k[a]) - (g[d ? 'w': 'h'] * k[a])) : parseInt(b));            if (k[a] == 0) {                k[a]++            }        };        for (var b in k) {            m(b, f['backgroundPosition' + b])        }        e.vml.image.fill.position = (k.X / g.W) + ',' + (k.Y / g.H);        var n = f.backgroundRepeat;        var p = {            'T': 1,            'R': g.W + i,            'B': g.H,            'L': 1 + i        };        var q = {            'X': {                'b1': 'L',                'b2': 'R',                'd': 'W'            },            'Y': {                'b1': 'T',                'b2': 'B',                'd': 'H'            }        };        if (n != 'repeat') {            var c = {                'T': (k.Y),                'R': (k.X + g.w),                'B': (k.Y + g.h),                'L': (k.X)            };            if (n.search('repeat-') != -1) {                var v = n.split('repeat-')[1].toUpperCase();                c[q[v].b1] = 1;                c[q[v].b2] = g[q[v].d]            }            if (c.B > g.H) {                c.B = g.H            }            e.vml.image.shape.style.clip = 'rect(' + c.T + 'px ' + (c.R + i) + 'px ' + c.B + 'px ' + (c.L + i) + 'px)'        } else {            e.vml.image.shape.style.clip = 'rect(' + p.T + 'px ' + p.R + 'px ' + p.B + 'px ' + p.L + 'px)'        }    },    fixPng: function(a) {        a.style.behavior = 'none';        if (a.nodeName == 'BODY' || a.nodeName == 'TD' || a.nodeName == 'TR') {            return        }        a.isImg = false;        if (a.nodeName == 'IMG') {            if (a.src.toLowerCase().search(/\.png$/) != -1) {                a.isImg = true;                a.style.visibility = 'hidden'            } else {                return            }        } else if (a.currentStyle.backgroundImage.toLowerCase().search('.png') == -1) {            return        }        var b = EvPNG;        a.vml = {            color: {},            image: {}        };        var c = {            shape: {},            fill: {}        };        for (var r in a.vml) {            for (var e in c) {                var d = b.ns + ':' + e;                a.vml[r][e] = document.createElement(d)            }            a.vml[r].shape.stroked = false;            a.vml[r].shape.appendChild(a.vml[r].fill);            a.parentNode.insertBefore(a.vml[r].shape, a)        }        a.vml.image.shape.fillcolor = 'none';        a.vml.image.fill.type = 'tile';        a.vml.color.fill.on = false;        b.attachHandlers(a);        b.giveLayout(a);        b.giveLayout(a.offsetParent);        b.applyVML(a)    }};try {    document.execCommand("BackgroundImageCache", false, true)} catch(r) {}EvPNG.createVmlNameSpace();EvPNG.createVmlStyleSheet();