png格式图⽚背景不透明问题解决
⽅法⼀（CSS滤镜，某些时候不管⽤）：
⽅法⼆：（引⽤js⼯具类，成功）
var DD_belatedPNG={ns:"DD_belatedPNG",imgSize:{},delay:10,nodesFixed:0,createVmlNameSpace:function(){if(document.namespaces&&!document.namespaces[this.ns])
{document.namespaces.add(this.ns,"urn:schemas-microsoft-com:vml")}},createVmlStyleSheet:function(){var
b,a;ateElement("style");b.setAttribute("media","screen");document.documentElement.firstChild.insertBefore(b,document.documentElement.firstChild.firstChild);if(b.styleSheet)
{b=b.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.screenStyleSheet=b;ateElement("style");a.setAttribute("media","print");document.documentElement.firstChild.insertBefore(a,document.documentElement.firstChild {display: none !important;}");a.addRule("img."+this.ns+"_sizeFinder","{display: none !important;}")}},readPropertyChange:function(){var
b,c,a;b=event.srcElement;if(!b.vmlInitiated){return}if(event.propertyName.search("background")!=-1||event.propertyName.search("border")!=-1)
{DD_belatedPNG.applyVML(b)}if(event.propertyName=="style.display"){c=(b.currentStyle.display=="none")?"none":"block";for(a in b.vml){if(b.vml.hasOwnProperty(a))
{b.vml[a].shape.style.display=c}}}if(event.propertyName.search("filter")!=-1){DD_belatedPNG.vmlOpacity(b)}},vmlOpacity:function(b){if(b.currentStyle.filter.search("lpha")!=-1){var
a=b.currentStyle.filter;a=parseInt(a.substring(a.lastIndexOf("=")+1,a.lastIndexOf(")")),10)/100;lor.shape.style.filter=b.currentStyle.filter;b.vml.image.fill.opacity=a}},handlePseudoHover:function(a) {setTimeout(function(){DD_belatedPNG.applyVML(a)},1)},fix:function(a){if(this.screenStyleSheet){var c,b;c=a.split(",");for(b=0;b<c.length;b++)
{this.screenStyleSheet.addRule(c[b],"behavior:expression(DD_belatedPNG.fixPng(this))")}}},applyVML:function(a)
{a.runtimeStyle.cssText="";this.vmlFill(a);this.vmlOffsets(a);this.vmlOpacity(a);if(a.isImg){pyImageBorders(a)}},attachHandlers:function(i){var d,c,g,e,b,f;d=this;c= {resize:"vmlOffsets",move:"vmlOffsets"};deName=="A"){e=
{mouseleave:"handlePseudoHover",mouseenter:"handlePseudoHover",focus:"handlePseudoHover",blur:"handlePseudoHover"};for(b in e){if(e.hasOwnProperty(b))
{c[b]=e[b]}}}for(f in c){if(c.hasOwnProperty(f)){g=function(){d[c[f]](i)};i.attachEvent("on"+f,g)}}i.attachEvent("onpropertychange",adPropertyChange)},giveLayout:function(a)
{=1;if(a.currentStyle.position=="static"){a.style.position="relative"}},copyImageBorders:function(b){var c,a;c=
{borderStyle:true,borderWidth:true,borderColor:true};for(a in c){if(c.hasOwnProperty(a)){lor.shape.style[a]=b.currentStyle[a]}}},vmlFill:function(e){if(!e.currentStyle)
{return}else{var d,f,g,b,a,c;d=e.currentStyle}for(b in e.vml){if(e.vml.hasOwnProperty(b))
{e.vml[b].shape.style.zIndex=d.zIndex}}e.runtimeStyle.backgroundColor="";e.runtimeStyle.backgroundImage="";f=true;if(d.backgroundImage!="none"||e.isImg){if(!e.isImg)
{e.vmlBg=d.backgroundImage;e.vmlBg=e.vmlBg.substr(5,e.vmlBg.lastIndexOf('")')-5)}else{e.vmlBg=e.src}g=this;if(!g.imgSize[e.vmlBg])
{ateElement("img");g.imgSize[e.vmlBg]=a;a.className=g.ns+"_sizeFinder";a.runtimeStyle.cssText="behavior:none; position:absolute; left:-10000px; top:-
10000px; border:none; margin:0; padding:0;";c=function()
{this.width=this.offsetWidth;this.height=this.offsetHeight;g.vmlOffsets(e)};a.attachEvent("onload",c);a.src=e.veAttribute("width");a.removeAttribute("height");document.body.insertBefore(a,do {var h,n,a,e,g,m,f,l,j,i,k;h=d.currentStyle;n=
{W:d.clientWidth+1,H:d.clientHeight+1,w:this.imgSize[d.vmlBg].width,h:this.imgSize[d.vmlBg].height,L:d.offsetLeft,T:d.offsetTop,bLW:d.clientLeft,bTW:d.clientTop};a=
(n.L+n.bLW==1)?1:0;e=function(b,p,q,c,s,u){b.coordsize=c+","+dorigin=u+","+u;b.path="m0,0l"+c+",0l"+c+","+s+"l0,"+s+"
htmlborderxe";b.style.width=c+"px";b.style.height=s+"px";b.style.left=p+"px";p=q+"px"};e(lor.shape,(n.L+(d.isImg?0:n.bLW)),(n.T+(d.isImg?0:n.bTW)),(n.W-1),(n.H-
1),0);e(d.vml.image.shape,(n.L+n.bLW),(n.T+n.bTW),(n.W),(n.H),1);g={X:0,Y:0};if(d.isImg){g.X=parseInt(h.paddingLeft,10)+1;g.Y=parseInt(h.paddingTop,10)+1}else{for(j in g)
{if(g.hasOwnProperty(j)){this.figurePercentage(g,n,j,h["backgroundPosition"+j])}}}d.vml.image.fill.position=(g.X/n.W)+","+(g.Y/n.H);m=h.backgroundRepeat;f=
{T:1,R:n.W+a,B:n.H,L:1+a};l={X:{b1:"L",b2:"R",d:"W"},Y:{b1:"T",b2:"B",d:"H"}};if(m!="repeat"||d.isImg){i={T:(g.Y),R:(g.X+n.w),B:(g.Y+n.h),L:(g.X)};if(m.search("repeat-")!=-1)
{k=m.split("repeat-")[1].toUpperCase();i[l[k].b1]=1;i[l[k].b2]=n[l[k].d]}if(i.B>n.H){i.B=n.H}d.vml.image.shape.style.clip="rect("+i.T+"px "+(i.R+a)+"px "+i.B+"px "+
(i.L+a)+"px)"}else{d.vml.image.shape.style.clip="rect("+f.T+"px "+f.R+"px "+f.B+"px "+f.L+"px)"}},figurePercentage:function(d,c,f,a){var b,e;e=true;b=(f=="X");switch(a)
{case"left":case"top":d[f]=0;break;case"center":d[f]=0.5;break;case"right":case"bottom":d[f]=1;break;default:if(a.search("%")!=-1)
{d[f]=parseInt(a,10)/100}else{e=false}}d[f]=il(e?((c[b?"W":"H"]*d[f])-(c[b?"w":"h"]*d[f])):parseInt(a,10));if(d[f]%2===0){d[f]++}return d[f]},fixPng:function(c)
{c.style.behavior="none";var g,b,f,a,d;deName=="BODY"||c.nodeName=="TD"||c.nodeName=="TR"){return}c.isImg=false;if(
{if(LowerCase().search(/\.png$/)!=-1){c.isImg=true;c.style.visibility="hidden"}else{return}}else{if(c.LowerCase().search(".png")==-1)
{return}}g=DD_belatedPNG;c.vml={color:{},image:{}};b={shape:{},fill:{}};for(a in c.vml){if(c.vml.hasOwnProperty(a)){for(d in b){if(b.hasOwnProperty(d)){f=g.ns+":"+d;c.vml[a]
[d]=ateElement(f)}}c.vml[a].shape.stroked=false;c.vml[a].shape.appendChild(c.vml[a].fill);c.parentNode.insertBefore(c.vml[a].shape,c)}}c.vml.image.shape.fillcolor="none";c.vml.p {}ateVmlNameSpace();ateVmlStyleSheet();
调⽤⽅式（fix⾥⾯的参数为css类）：
{
DD_belatedPNG.fix(".msg0,.msg");
}

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