jquery 实现鼠标划过图片出现放大镜效果

[javascript]代码库

/*滑过图片出现放大镜效果*/
$(function () {
    $(".content_right .prolist ul li").each(function (index) {
        var position = $(this).position();
        var li_left = position.left;
        var li_top = position.top;
        var img_width = $(this).find("img").width();
        var img_height = $(this).find("img").height();
        var spanHtml = '<span style="position: absolute; top: ' + li_top + 'px; left: ' + li_left + 'px; width:' + img_width + 'px; height: ' + img_height + 'px; cursor: pointer;" class="imageMask"></span>';
        $(spanHtml).hover(function () {
            $(this).addClass("imageOver");
        }, function () {
            $(this).removeClass("imageOver");
        }).appendTo($(this).find("a"));
    })
})