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function _replaceRemoteImg(sHtml,Qydoc){
	if(downimg){
		var arrRemoteImgs=[],count=0;
		sHtml=sHtml.replace(/(<img)((?:\s+[^>]*?)?(?:\s+src="\s*([^"]+)\s*")(?: [^>]*)?)(\/?>)/ig,function(all,left,attr,url,right){
			if(url.indexOf(Kdomain)<0){
				arrRemoteImgs[count]=url;
				attr=attr.replace(/\s+(width|height)="[^"]*"/ig,'').replace(/\s+src="[^"]*"/ig,' src="'+by.m+'l1.gif"')
				count++
			}
			return left+attr+right;
		});
		if(arrRemoteImgs.length>0){
			$.post(arrRemoteImgsurl,{urls:arrRemoteImgs.join('|')},function(data){
				var arrRemotehtml=[];
				var dataall=data.split('|');
				var thisall=Qydoc.html().split(alldoc);
				for(var i=0;i<=thisall.length;i++){
					if(i<dataall.length){
						arrRemotehtml[i]=thisall[i]+dataall[i]
					}else{
						arrRemotehtml[i]=thisall[i]
					}
				}
				Qydoc.html(''+arrRemotehtml.join('')+'')
			})
		}
	}
	return sHtml;
}

不知道性能怎么样，求大侠指点

楼主试验效果怎么样？