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png图片IE6下透明的方法

来源:http://www.baisoubao.cn/  发布者:网站建设 发布时间:2012-2-23 22:59:11 浏览量:
 

用过2个方法都能解决。

一个是对于html中img标签的,IE6不支持PNG半透明图片的缺陷为web设计带来了极大的不便,但有一种网上比较流行的方法可以改变这个状况,下面详细介绍这种方法:
把以下代码保存为correctpng.js

----------------------------------http://www.baisoubao.cn/correctpng.js --------------------------------
function correctPNG()
{
   for(var i=0; i   {
   var img = document.images[i]
   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
   if (img.align == "left") imgStyle = "float:left;" + imgStyle
   if (img.align == "right") imgStyle = "float:right;" + imgStyle
   if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
   var strNewHTML = "   + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
   + "(src=\'" + img.src + "\', sizingMethod='scale');\">
"
   img.outerHTML = strNewHTML
   i = i-1
   };
   };
};

if(navigator.userAgent.indexOf("MSIE")>-1)
{
window.attachEvent("onload", correctPNG);
};

----------------------------------correctpng.js --------------------------------

在网页的头部引用一下


使用的时候直接用img标签即可。

 


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另外一种是对于css嵌入background图的:

 

 

-----------------------------ie_png.js--------------------------------------------
var ie_png = {

 ns: 'ie_png',
 imgSize: {},
 
 createVmlNameSpace: function() { /* enable VML */
  if (document.namespaces && !document.namespaces[this.ns]) {
    document.namespaces.add(this.ns, 'urn:schemas-microsoft-com:vml');
  }
  if (window.attachEvent) {
   window.attachEvent('onbeforeunload', function() {
    ie_png = null;
   });
  }
 },
 
 createVmlStyleSheet: function() { /* style VML, enable behaviors */
  /*
   Just in case lots of other developers have added
   lots of other stylesheets using document.createStyleSheet
   and hit the 31-limit mark, let's not use that method!
   further reading: http://msdn.microsoft.com/en-us/library/ms531194(VS.85).aspx
  */
  var style = document.createElement('style');
  document.documentElement.firstChild.insertBefore(style, document.documentElement.firstChild.firstChild);
  var styleSheet = style.styleSheet;
  styleSheet.addRule(this.ns + '\\:*', '{behavior:url(#default#VML)}');
  styleSheet.addRule(this.ns + '\\:shape', 'position:absolute;');
  styleSheet.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/ */
  this.styleSheet = styleSheet;
 },
 
 readPropertyChange: function() {
  var el = event.srcElement;
  if (event.propertyName.search('background') != -1 || event.propertyName.search('border') != -1) {
   ie_png.applyVML(el);
  }
  if (event.propertyName == 'style.display') {
   var display = (el.currentStyle.display == 'none') ? 'none' : 'block';
   for (var v in el.vml) {
    el.vml[v].shape.style.display = display;
   }
  }
  if (event.propertyName.search('filter') != -1) {
   ie_png.vmlOpacity(el);
  }
 },
 
 vmlOpacity: function(el) {
  if (el.currentStyle.filter.search('lpha') != -1) {
   var trans = el.currentStyle.filter;
   trans = parseInt(trans.substring(trans.lastIndexOf('=')+1, trans.lastIndexOf(')')), 10)/100;
   el.vml.color.shape.style.filter = el.currentStyle.filter; /* complete guesswork */
   el.vml.image.fill.opacity = trans; /* complete guesswork */
  }
 },
 
 handlePseudoHover: function(el) {
  setTimeout(function() { /* wouldn't work as intended without setTimeout */
   ie_png.applyVML(el);
  }, 1);
 },
 
 /**
 * This is the method to use in a document.
 * @param {String} selector - REQUIRED - a CSS selector, such as '#doc .container'
 **/
 fix: function(selector) {
  var selectors = selector.split(','); /* multiple selectors supported, no need for multiple calls to this anymore */
  for (var i=0; i   this.styleSheet.addRule(selectors[i], 'behavior:expression(ie_png.fixPng(this))'); /* seems to execute the function without adding it to the stylesheet - interesting... */
  }
 },
 
 applyVML: function(el) {
  el.runtimeStyle.cssText = '';
  this.vmlFill(el);
  this.vmlOffsets(el);
  this.vmlOpacity(el);
  if (el.isImg) {
   this.copyImageBorders(el);
  }
 },
 
 attachHandlers: function(el) {
  var self = this;
  var handlers = {resize: 'vmlOffsets', move: 'vmlOffsets'};
  if (el.nodeName == 'A') {
   var moreForAs = {mouseleave: 'handlePseudoHover', mouseenter: 'handlePseudoHover', focus: 'handlePseudoHover', blur: 'handlePseudoHover'};
   for (var a in moreForAs) {
    handlers[a] = moreForAs[a];
   }
  }
  for (var h in handlers) {
   el.attachEvent('on' + h, function() {
    self[handlers[h]](el);
   });
  }
  el.attachEvent('onpropertychange', this.readPropertyChange);
 },
 
 giveLayout: function(el) {
  el.style.zoom = 1;
  if (el.currentStyle.position == 'static') {
   el.style.position = 'relative';
  }
 },
 
 copyImageBorders: function(el) {
  var styles = {'borderStyle':true, 'borderWidth':true, 'borderColor':true};
  for (var s in styles) {
   el.vml.color.shape.style[s] = el.currentStyle[s];
  }
 },
 
 vmlFill: function(el) {
  if (!el.currentStyle) {
   return;
  } else {
   var elStyle = el.currentStyle;
  }
  for (var v in el.vml) {
   el.vml[v].shape.style.zIndex = elStyle.zIndex;
  }
  el.runtimeStyle.backgroundColor = '';
  el.runtimeStyle.backgroundImage = '';
  var noColor = (elStyle.backgroundColor == 'transparent');
  var noImg = true;
  if (elStyle.backgroundImage != 'none' || el.isImg) {
   if (!el.isImg) {
    el.vmlBg = elStyle.backgroundImage;
    el.vmlBg = el.vmlBg.substr(5, el.vmlBg.lastIndexOf('")')-5);
   }
   else {
    el.vmlBg = el.src;
   }
   var lib = this;
   if (!lib.imgSize[el.vmlBg]) { /* determine size of loaded image */
    var img = document.createElement('img');
    lib.imgSize[el.vmlBg] = img;
    img.className = lib.ns + '_sizeFinder';
    img.runtimeStyle.cssText = 'behavior:none; position:absolute; left:-10000px; top:-10000px; border:none;'; /* make sure to set behavior to none to prevent accidental matching of the helper elements! */
    img.attachEvent('onload', function() {
     this.width = this.offsetWidth; /* weird cache-busting requirement! */
     this.height = this.offsetHeight;
     lib.vmlOffsets(el);
    });
    img.src = el.vmlBg;
    img.removeAttribute('width');
    img.removeAttribute('height');
    document.body.insertBefore(img, document.body.firstChild);
   }
   el.vml.image.fill.src = el.vmlBg;
   noImg = false;
  }
  el.vml.image.fill.on = !noImg;
  el.vml.image.fill.color = 'none';
  el.vml.color.shape.style.backgroundColor = elStyle.backgroundColor;
  el.runtimeStyle.backgroundImage = 'none';
  el.runtimeStyle.backgroundColor = 'transparent';
 },
 
 /* 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 */
 vmlOffsets: function(el) {
  var thisStyle = el.currentStyle;
  var 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};
  var fudge = (size.L + size.bLW == 1) ? 1 : 0;
  
  /* vml shape, left, top, width, height, origin */
  var makeVisible = function(vml, l, t, w, h, o) {
   vml.coordsize = w+','+h;
   vml.coordorigin = o+','+o;
   vml.path = 'm0,0l'+w+',0l'+w+','+h+'l0,'+h+' xe';
   vml.style.width = w + 'px';
   vml.style.height = h + 'px';
   vml.style.left = l + 'px';
   vml.style.top = t + 'px';
  };
  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);
  makeVisible(el.vml.image.shape, (size.L + size.bLW), (size.T + size.bTW), (size.W), (size.H), 1);
  
  var bg = {'X':0, 'Y':0};
  var figurePercentage = function(axis, position) {
   var fraction = true;
   switch(position) {
    case 'left':
    case 'top':
     bg[axis] = 0;
     break;
    case 'center':
     bg[axis] = .5;
     break;
    case 'right':
    case 'bottom':
     bg[axis] = 1;
     break;
    default:
     if (position.search('%') != -1) {
      bg[axis] = parseInt(position)*.01;
     }
     else {
      fraction = false;
     }
   }
   var horz = (axis == 'X');
   bg[axis] = Math.ceil(fraction ? ( (size[horz?'W': 'H'] * bg[axis]) - (size[horz?'w': 'h'] * bg[axis]) ) : parseInt(position));
   if (bg[axis] == 0) {
    bg[axis]++;
   }
  };
  for (var b in bg) {
   figurePercentage(b, thisStyle['backgroundPosition'+b]);
  }
  
  el.vml.image.fill.position = (bg.X/size.W) + ',' + (bg.Y/size.H);
  
  var bgR = thisStyle.backgroundRepeat;
  var dC = {'T':1, 'R':size.W+fudge, 'B':size.H, 'L':1+fudge}; /* these are defaults for repeat of any kind */
  var altC = { 'X': {'b1': 'L', 'b2': 'R', 'd': 'W'}, 'Y': {'b1': 'T', 'b2': 'B', 'd': 'H'} };
  if (bgR != 'repeat') {
   var 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 */
   if (bgR.search('repeat-') != -1) { /* now let's revert to dC for repeat-x or repeat-y */
    var v = bgR.split('repeat-')[1].toUpperCase();
    c[altC[v].b1] = 1;
    c[altC[v].b2] = size[altC[v].d];
   }
   if (c.B > size.H) {
    c.B = size.H;
   }
   el.vml.image.shape.style.clip = 'rect('+c.T+'px '+(c.R+fudge)+'px '+c.B+'px '+(c.L+fudge)+'px)';
  }
  else {
   el.vml.image.shape.style.clip = 'rect('+dC.T+'px '+dC.R+'px '+dC.B+'px '+dC.L+'px)';
  }
 },
 
 fixPng: function(el) {
  el.style.behavior = 'none';
  if (el.nodeName == 'BODY' || el.nodeName == 'TD' || el.nodeName == 'TR') { /* elements not supported yet */
   return;
  }
  el.isImg = false;
  if (el.nodeName == 'IMG') {
   if(el.src.toLowerCase().search(/\.png$/) != -1) {
    el.isImg = true;
    el.style.visibility = 'hidden';
   }
   else {
    return;
   }
  }
  else if (el.currentStyle.backgroundImage.toLowerCase().search('.png') == -1) {
   return;
  }
  var lib = ie_png;
  el.vml = {color: {}, image: {}};
  var els = {shape: {}, fill: {}};
  for (var r in el.vml) {
   for (var e in els) {
    var nodeStr = lib.ns + ':' + e;
    el.vml[r][e] = document.createElement(nodeStr);
   }
   el.vml[r].shape.stroked = false;
   el.vml[r].shape.appendChild(el.vml[r].fill);
   el.parentNode.insertBefore(el.vml[r].shape, el);
  }
  el.vml.image.shape.fillcolor = 'none'; /* Don't show blank white shapeangle when waiting for image to load. */
  el.vml.image.fill.type = 'tile'; /* Ze magic!! Makes image show up. */
  el.vml.color.fill.on = false; /* Actually going to apply vml element's style.backgroundColor, so hide the whiteness. */
  
  lib.attachHandlers(el);
  
  lib.giveLayout(el);
  lib.giveLayout(el.offsetParent);
  
  /* set up element */
  lib.applyVML(el);
 }
 
};
try {
 document.execCommand("BackgroundImageCache", false, true); /* TredoSoft Multiple IE doesn't like this, so try{} it */
} catch(r) {}
ie_png.createVmlNameSpace();
ie_png.createVmlStyleSheet();
-----------------------------ie_png.js--------------------------------------------


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