来v2请教个js兼容性的问题

感觉应该是js引起的。在ie下和chrome下，会出现一点点差异，具体表现在，ie下所在的高度，比chrome下的要低一些，

(function($){$.fn.imagezoom=function(options){var settings={xzoom:310,yzoom:300,offset:10,position:"BTR",preload:1};if(options){$.extend(settings,options);}
var noalt='';var self=this;$(this).bind("mouseenter",function(ev){var imageLeft=$(this).offset().left;var imageTop=$(this).offset().top;var imageWidth=$(this).get(0).offsetWidth;var imageHeight=$(this).get(0).offsetHeight;var boxLeft=$(this).parent().offset().left;var boxTop=$(this).parent().offset().top;var boxWidth=$(this).parent().width();var boxHeight=$(this).parent().height();noalt=$(this).attr("alt");var bigimage=$(this).attr("rel");$(this).attr("alt",'');if($("div.zoomDiv").get().length==0){$(document.body).append("<div class='zoomDiv'><img class='bigimg' src='"+bigimage+"'/></div><div class='zoomMask'> </div>");}
if(settings.position=="BTR"){if(boxLeft+boxWidth+settings.offset+settings.xzoom>screen.width){leftpos=boxLeft-settings.offset-settings.xzoom;}else{leftpos=boxLeft+boxWidth+settings.offset;}}else{leftpos=imageLeft-settings.xzoom-settings.offset;if(leftpos<0){leftpos=imageLeft+imageWidth+settings.offset;}}
$("div.zoomDiv").css({top:boxTop,left:leftpos});$("div.zoomDiv").width(settings.xzoom);$("div.zoomDiv").height(settings.yzoom);$("div.zoomDiv").show();$(this).css('cursor','crosshair');$(document.body).mousemove(function(e){mouse=new MouseEvent(e);if(mouse.x<imageLeft||mouse.x>imageLeft+imageWidth||mouse.y<imageTop||mouse.y>imageTop+imageHeight){mouseOutImage();return;}
var bigwidth=$(".bigimg").get(0).offsetWidth;var bigheight=$(".bigimg").get(0).offsetHeight;var scaley='x';var scalex='y';if(isNaN(scalex)|isNaN(scaley)){var scalex=(bigwidth/imageWidth);var scaley=(bigheight/imageHeight);$("div.zoomMask").width((settings.xzoom)/scalex);$("div.zoomMask").height((settings.yzoom)/scaley);$("div.zoomMask").css('visibility','visible');}
xpos=mouse.x-$("div.zoomMask").width()/2;ypos=mouse.y-$("div.zoomMask").height()/2;xposs=mouse.x-$("div.zoomMask").width()/2-imageLeft;yposs=mouse.y-$("div.zoomMask").height()/2-imageTop;xpos=(mouse.x-$("div.zoomMask").width()/2<imageLeft)?imageLeft:(mouse.x+$("div.zoomMask").width()/2>imageWidth+imageLeft)?(imageWidth+imageLeft-$("div.zoomMask").width()):xpos;ypos=(mouse.y-$("div.zoomMask").height()/2<imageTop)?imageTop:(mouse.y+$("div.zoomMask").height()/2>imageHeight+imageTop)?(imageHeight+imageTop-$("div.zoomMask").height()):ypos;$("div.zoomMask").css({top:ypos,left:xpos});$("div.zoomDiv").get(0).scrollLeft=xposs*scalex;$("div.zoomDiv").get(0).scrollTop=yposs*scaley;});});function mouseOutImage(){$(self).attr("alt",noalt);$(document.body).unbind("mousemove");$("div.zoomMask").remove();$("div.zoomDiv").remove();}
count=0;if(settings.preload){$('body').append("<div style='display:none;' class='jqPreload"+count+"'></div>");$(this).each(function(){var imagetopreload=$(this).attr("rel");var content=jQuery('div.jqPreload'+count+'').html();jQuery('div.jqPreload'+count+'').html(content+'<img src=\"'+imagetopreload+'\">');});}}})(jQuery);function MouseEvent(e){this.x=e.pageX;this.y=e.pageY;}