jquery图片放大插件鼠标悬停图片放大效果

都知道jquery都插件是非常强大的，最近分享点jquery插件效果，方便效果开发使用。
一、HTML代码

二、插件代码（插件名称：jquery.zoomImgRollover.js）

(function(jQuery){ 

    jQuery.fn.zoomImgRollover = function(options) {

        var defaults = {
            percent:30,
            duration:600
        }; 

        var opts = jQuery.extend(defaults, options);
        
        // static zoom function
        function imageZoomStep(jZoomImage, x, origWidth, origHeight)
        {
            var width = Math.round(origWidth * (.5 + ((x * opts.percent) / 200))) * 2;
            var height = Math.round(origHeight * (.5 + ((x * opts.percent) / 200))) * 2;
                
            var left = (width - origWidth) / 2;
            var top = (height - origHeight) / 2;
        
            jZoomImage.css({width:width, height:height, top:-top, left:-left});
        }

        return this.each(function()
        {
            var jZoomImage = jQuery(this);
            var origWidth = jZoomImage.width();
            var origHeight = jZoomImage.height();
            
            // add css ness. to allow zoom
            jZoomImage.css({position: "relative"});
            jZoomImage.parent().css({overflow: "hidden", display:"block", position: "relative", width: origWidth, height: origHeight});
            
            jZoomImage.mouseover(function()
            {
                jZoomImage.stop().animate({dummy:1},{duration:opts.duration, step:function(x)
                {
                    imageZoomStep(jZoomImage, x, origWidth, origHeight)
                }});
            });

            jZoomImage.mouseout(function()
            {
                jZoomImage.stop().animate({dummy:0},{duration:opts.duration, step:function(x)
                {
                    imageZoomStep(jZoomImage, x, origWidth, origHeight)
                }});
            });
        });
    };

})(jQuery);