开发技术学习

$(".app a").bind({
                        mouseenter:function(){
                                $(this).children("img").animate({filter:'alpha(opacity=50)',opacity:'0.5'});
                                $(this).children("b").fadeIn();
                                },  
                        mouseleave:function(){
                                $(this).children("img").animate({filter:'alpha(opacity=100)',opacity:'1'});
                                $(this).children("b").fadeOut();
                                }
        });