ie 6 png解决透明方法

<!--[if IE 6]> <script src="js/DD_belatedPNG_0.0.8a.js"></script> <script>   DD_belatedPNG.fix('.ab,.ab1,.ab2,.ab3,.ab4,.ab5,.ab6,.ab7'); </script> <![endif]-->

 

专门解决ie6 png格式的问题,用法:粘贴上述代码,链接到DD_belatedPNG_0.0.8a.js, DD_belatedPNG.fix('.ab,.ab1,.ab2,.ab3,.ab4,.ab5,.ab6,.ab7');

.ab,.ab1,.ab2,.ab3,.ab4,.ab5,.ab6,.ab7是页面用到png的class名称

 

DD_belatedPNG_0.0.8a.js

当前路径:web/js/DD_belatedPNG_0.0.8a.js
2 /**
3 * DD_belatedPNG: Adds IE6 support: PNG images for CSS background-image and HTML <IMG/>.
4 * Author: Drew Diller
5 * Email: drew.diller@gmail.com
6 * URL: http://www.dillerdesign.com/experiment/DD_belatedPNG/
7 * Version: 0.0.8a
8 * Licensed under the MIT License: http://dillerdesign.com/experiment/DD_belatedPNG/#license
9 *
10 * Example usage:
11 * DD_belatedPNG.fix('.png_bg'); // argument is a CSS selector
12 * DD_belatedPNG.fixPng( someNode ); // argument is an HTMLDomElement
13 **/
14  
15 /*
16 PLEASE READ:
17 Absolutely everything in this script is SILLY.  I know this.  IE's rendering of certain pixels doesn't make sense, so neither does this code!
18 */
19  
20 var DD_belatedPNG = {
21     ns: 'DD_belatedPNG',
22     imgSize: {},
23     delay: 10,
24     nodesFixed: 0,
25     createVmlNameSpace: function () { /* enable VML */
26         if (document.namespaces && !document.namespaces[this.ns]) {
27             document.namespaces.add(this.ns, 'urn:schemas-microsoft-com:vml');
28         }
29     },
30     createVmlStyleSheet: function () { /* style VML, enable behaviors */
31         /*
32             Just in case lots of other developers have added
33             lots of other stylesheets using document.createStyleSheet
34             and hit the 31-limit mark, let's not use that method!
35             further reading: http://msdn.microsoft.com/en-us/library/ms531194(VS.85).aspx
36         */
37         var screenStyleSheet, printStyleSheet;
38         screenStyleSheet = document.createElement('style');
39         screenStyleSheet.setAttribute('media', 'screen');
40         document.documentElement.firstChild.insertBefore(screenStyleSheet, document.documentElement.firstChild.firstChild);
41         if (screenStyleSheet.styleSheet) {
42             screenStyleSheet = screenStyleSheet.styleSheet;
43             screenStyleSheet.addRule(this.ns + '\\:*', '{behavior:url(#default#VML)}');
44             screenStyleSheet.addRule(this.ns + '\\:shape', 'position:absolute;');
45             screenStyleSheet.addRule('img.' + this.ns + '_sizeFinder', 'behavior:none; border:none; position:absolute; z-index:-1; top:-10000px; visibility:hidden;'); /* large negative top value for avoiding vertical scrollbars for large images, suggested by James O'Brien, http://www.thanatopsic.org/hendrik/ */
46             this.screenStyleSheet = screenStyleSheet;
47            
48             /* Add a print-media stylesheet, for preventing VML artifacts from showing up in print (including preview). */
49             /* Thanks to R閙i Pr関ost for automating this! */
50             printStyleSheet = document.createElement('style');
51             printStyleSheet.setAttribute('media', 'print');
52             document.documentElement.firstChild.insertBefore(printStyleSheet, document.documentElement.firstChild.firstChild);
53             printStyleSheet = printStyleSheet.styleSheet;
54             printStyleSheet.addRule(this.ns + '\\:*', '{display: none !important;}');
55             printStyleSheet.addRule('img.' + this.ns + '_sizeFinder', '{display: none !important;}');
56         }
57     },
58     readPropertyChange: function () {
59         var el, display, v;
60         el = event.srcElement;
61         if (!el.vmlInitiated) {
62             return;
63         }
64         if (event.propertyName.search('background') != -1 || event.propertyName.search('border') != -1) {
65             DD_belatedPNG.applyVML(el);
66         }
67         if (event.propertyName == 'style.display') {
68             display = (el.currentStyle.display == 'none') ? 'none' : 'block';
69             for (v in el.vml) {
70                 if (el.vml.hasOwnProperty(v)) {
71                     el.vml[v].shape.style.display = display;
72                 }
73             }
74         }
75         if (event.propertyName.search('filter') != -1) {
76             DD_belatedPNG.vmlOpacity(el);
77         }
78     },
79     vmlOpacity: function (el) {
80         if (el.currentStyle.filter.search('lpha') != -1) {
81             var trans = el.currentStyle.filter;
82             trans = parseInt(trans.substring(trans.lastIndexOf('=')+1, trans.lastIndexOf(')')), 10)/100;
83             el.vml.color.shape.style.filter = el.currentStyle.filter; /* complete guesswork */
84             el.vml.image.fill.opacity = trans; /* complete guesswork */
85         }
86     },
87     handlePseudoHover: function (el) {
88         setTimeout(function () { /* wouldn't work as intended without setTimeout */
89             DD_belatedPNG.applyVML(el);
90         }, 1);
91     },
92     /**
93     * This is the method to use in a document.
94     * @param {String} selector - REQUIRED - a CSS selector, such as '#doc .container'
95     **/
96     fix: function (selector) {
97         if (this.screenStyleSheet) {
98             var selectors, i;
99             selectors = selector.split(','); /* multiple selectors supported, no need for multiple calls to this anymore */
100             for (i=0; i<selectors.length; i++) {
101                 this.screenStyleSheet.addRule(selectors[i], 'behavior:expression(DD_belatedPNG.fixPng(this))'); /* seems to execute the function without adding it to the stylesheet - interesting... */
102             }
103         }
104     },
105     applyVML: function (el) {
106         el.runtimeStyle.cssText = '';
107         this.vmlFill(el);
108         this.vmlOffsets(el);
109         this.vmlOpacity(el);
110         if (el.isImg) {
111             this.copyImageBorders(el);
112         }
113     },
114     attachHandlers: function (el) {
115         var self, handlers, handler, moreForAs, a, h;
116         self = this;
117         handlers = {resize: 'vmlOffsets', move: 'vmlOffsets'};
118         if (el.nodeName == 'A') {
119             moreForAs = {mouseleave: 'handlePseudoHover', mouseenter: 'handlePseudoHover', focus: 'handlePseudoHover', blur: 'handlePseudoHover'};
120             for (a in moreForAs) {         
121                 if (moreForAs.hasOwnProperty(a)) {
122                     handlers[a] = moreForAs[a];
123                 }
124             }
125         }
126         for (h in handlers) {
127             if (handlers.hasOwnProperty(h)) {
128                 handler = function () {
129                     self[handlers[h]](el);
130                 };
131                 el.attachEvent('on' + h, handler);
132             }
133         }
134         el.attachEvent('onpropertychange', this.readPropertyChange);
135     },
136     giveLayout: function (el) {
137         el.style.zoom = 1;
138         if (el.currentStyle.position == 'static') {
139             el.style.position = 'relative';
140         }
141     },
142     copyImageBorders: function (el) {
143         var styles, s;
144         styles = {'borderStyle':true, 'borderWidth':true, 'borderColor':true};
145         for (s in styles) {
146             if (styles.hasOwnProperty(s)) {
147                 el.vml.color.shape.style[s] = el.currentStyle[s];
148             }
149         }
150     },
151     vmlFill: function (el) {
152         if (!el.currentStyle) {
153             return;
154         } else {
155             var elStyle, noImg, lib, v, img, imgLoaded;
156             elStyle = el.currentStyle;
157         }
158         for (v in el.vml) {
159             if (el.vml.hasOwnProperty(v)) {
160                 el.vml[v].shape.style.zIndex = elStyle.zIndex;
161             }
162         }
163         el.runtimeStyle.backgroundColor = '';
164         el.runtimeStyle.backgroundImage = '';
165         noImg = true;
166         if (elStyle.backgroundImage != 'none' || el.isImg) {
167             if (!el.isImg) {
168                 el.vmlBg = elStyle.backgroundImage;
169                 el.vmlBg = el.vmlBg.substr(5, el.vmlBg.lastIndexOf('")')-5);
170             }
171             else {
172                 el.vmlBg = el.src;
173             }
174             lib = this;
175             if (!lib.imgSize[el.vmlBg]) { /* determine size of loaded image */
176                 img = document.createElement('img');
177                 lib.imgSize[el.vmlBg] = img;
178                 img.className = lib.ns + '_sizeFinder';
179                 img.runtimeStyle.cssText = 'behavior:none; position:absolute; left:-10000px; top:-10000px; border:none; margin:0; padding:0;'; /* make sure to set behavior to none to prevent accidental matching of the helper elements! */
180                 imgLoaded = function () {
181                     this.width = this.offsetWidth; /* weird cache-busting requirement! */
182                     this.height = this.offsetHeight;
183                     lib.vmlOffsets(el);
184                 };
185                 img.attachEvent('onload', imgLoaded);
186                 img.src = el.vmlBg;
187                 img.removeAttribute('width');
188                 img.removeAttribute('height');
189                 document.body.insertBefore(img, document.body.firstChild);
190             }
191             el.vml.image.fill.src = el.vmlBg;
192             noImg = false;
193         }
194         el.vml.image.fill.on = !noImg;
195         el.vml.image.fill.color = 'none';
196         el.vml.color.shape.style.backgroundColor = elStyle.backgroundColor;
197         el.runtimeStyle.backgroundImage = 'none';
198         el.runtimeStyle.backgroundColor = 'transparent';
199     },
200     /* IE can't figure out what do when the offsetLeft and the clientLeft add up to 1, and the VML ends up getting fuzzy... so we have to push/enlarge things by 1 pixel and then clip off the excess */
201     vmlOffsets: function (el) {
202         var thisStyle, size, fudge, makeVisible, bg, bgR, dC, altC, b, c, v;
203         thisStyle = el.currentStyle;
204         size = {'W':el.clientWidth+1, 'H':el.clientHeight+1, 'w':this.imgSize[el.vmlBg].width, 'h':this.imgSize[el.vmlBg].height, 'L':el.offsetLeft, 'T':el.offsetTop, 'bLW':el.clientLeft, 'bTW':el.clientTop};
205         fudge = (size.L + size.bLW == 1) ? 1 : 0;
206         /* vml shape, left, top, width, height, origin */
207         makeVisible = function (vml, l, t, w, h, o) {
208             vml.coordsize = w+','+h;
209             vml.coordorigin = o+','+o;
210             vml.path = 'm0,0l'+w+',0l'+w+','+h+'l0,'+h+' xe';
211             vml.style.width = w + 'px';
212             vml.style.height = h + 'px';
213             vml.style.left = l + 'px';
214             vml.style.top = t + 'px';
215         };
216         makeVisible(el.vml.color.shape, (size.L + (el.isImg ? 0 : size.bLW)), (size.T + (el.isImg ? 0 : size.bTW)), (size.W-1), (size.H-1), 0);
217         makeVisible(el.vml.image.shape, (size.L + size.bLW), (size.T + size.bTW), (size.W), (size.H), 1 );
218         bg = {'X':0, 'Y':0};
219         if (el.isImg) {
220             bg.X = parseInt(thisStyle.paddingLeft, 10) + 1;
221             bg.Y = parseInt(thisStyle.paddingTop, 10) + 1;
222         }
223         else {
224             for (b in bg) {
225                 if (bg.hasOwnProperty(b)) {
226                     this.figurePercentage(bg, size, b, thisStyle['backgroundPosition'+b]);
227                 }
228             }
229         }
230         el.vml.image.fill.position = (bg.X/size.W) + ',' + (bg.Y/size.H);
231         bgR = thisStyle.backgroundRepeat;
232         dC = {'T':1, 'R':size.W+fudge, 'B':size.H, 'L':1+fudge}; /* these are defaults for repeat of any kind */
233         altC = { 'X': {'b1': 'L', 'b2': 'R', 'd': 'W'}, 'Y': {'b1': 'T', 'b2': 'B', 'd': 'H'} };
234         if (bgR != 'repeat' || el.isImg) {
235             c = {'T':(bg.Y), 'R':(bg.X+size.w), 'B':(bg.Y+size.h), 'L':(bg.X)}; /* these are defaults for no-repeat - clips down to the image location */
236             if (bgR.search('repeat-') != -1) { /* now let's revert to dC for repeat-x or repeat-y */
237                 v = bgR.split('repeat-')[1].toUpperCase();
238                 c[altC[v].b1] = 1;
239                 c[altC[v].b2] = size[altC[v].d];
240             }
241             if (c.B > size.H) {
242                 c.B = size.H;
243             }
244             el.vml.image.shape.style.clip = 'rect('+c.T+'px '+(c.R+fudge)+'px '+c.B+'px '+(c.L+fudge)+'px)';
245         }
246         else {
247             el.vml.image.shape.style.clip = 'rect('+dC.T+'px '+dC.R+'px '+dC.B+'px '+dC.L+'px)';
248         }
249     },
250     figurePercentage: function (bg, size, axis, position) {
251         var horizontal, fraction;
252         fraction = true;
253         horizontal = (axis == 'X');
254         switch(position) {
255             case 'left':
256             case 'top':
257                 bg[axis] = 0;
258                 break;
259             case 'center':
260                 bg[axis] = 0.5;
261                 break;
262             case 'right':
263             case 'bottom':
264                 bg[axis] = 1;
265                 break;
266             default:
267                 if (position.search('%') != -1) {
268                     bg[axis] = parseInt(position, 10) / 100;
269                 }
270                 else {
271                     fraction = false;
272                 }
273         }
274         bg[axis] = Math.ceil(  fraction ? ( (size[horizontal?'W': 'H'] * bg[axis]) - (size[horizontal?'w': 'h'] * bg[axis]) ) : parseInt(position, 10)  );
275         if (bg[axis] % 2 === 0) {
276             bg[axis]++;
277         }
278         return bg[axis];
279     },
280     fixPng: function (el) {
281         el.style.behavior = 'none';
282         var lib, els, nodeStr, v, e;
283         if (el.nodeName == 'BODY' || el.nodeName == 'TD' || el.nodeName == 'TR') { /* elements not supported yet */
284             return;
285         }
286         el.isImg = false;
287         if (el.nodeName == 'IMG') {
288             if(el.src.toLowerCase().search(/\.png$/) != -1) {
289                 el.isImg = true;
290                 el.style.visibility = 'hidden';
291             }
292             else {
293                 return;
294             }
295         }
296         else if (el.currentStyle.backgroundImage.toLowerCase().search('.png') == -1) {
297             return;
298         }
299         lib = DD_belatedPNG;
300         el.vml = {color: {}, image: {}};
301         els = {shape: {}, fill: {}};
302         for (v in el.vml) {
303             if (el.vml.hasOwnProperty(v)) {
304                 for (e in els) {
305                     if (els.hasOwnProperty(e)) {
306                         nodeStr = lib.ns + ':' + e;
307                         el.vml[v][e] = document.createElement(nodeStr);
308                     }
309                 }
310                 el.vml[v].shape.stroked = false;
311                 el.vml[v].shape.appendChild(el.vml[v].fill);
312                 el.parentNode.insertBefore(el.vml[v].shape, el);
313             }
314         }
315         el.vml.image.shape.fillcolor = 'none'; /* Don't show blank white shapeangle when waiting for image to load. */
316         el.vml.image.fill.type = 'tile'; /* Makes image show up. */
317         el.vml.color.fill.on = false; /* Actually going to apply vml element's style.backgroundColor, so hide the whiteness. */
318         lib.attachHandlers(el);
319         lib.giveLayout(el);
320         lib.giveLayout(el.offsetParent);
321         el.vmlInitiated = true;
322         lib.applyVML(el); /* Render! */
323     }
324 };
325 try {
326     document.execCommand("BackgroundImageCache", false, true); /* TredoSoft Multiple IE doesn't like this, so try{} it */
327 } catch(r) {}
328 DD_belatedPNG.createVmlNameSpace();
329 DD_belatedPNG.createVmlStyleSheet();
posted @ 2013-05-07 18:42  Forever.Sun  阅读(129)  评论(0)    收藏  举报