2 ai137853 ai137853 于 2014.10.08 18:02 提问

这个效果的原理 求解 主要是那个加粗的代码怎么解释

<!DOCTYPE html>



标题 $(function() { $("#box").on("mouseenter mouseleave",function(e) { var w = $(this).width(); var h = $(this).height(); **var x = (e.pageX - this.offsetLeft - (w / 2)) * (w > h ? (h / w) : 1); var y = (e.pageY - this.offsetTop - (h / 2)) * (h > w ? (w / h) : 1);** var dirNum = Math.round((((Math.atan2(y, x) * (180 / Math.PI)) + 180) / 90) + 3) % 4; var eventType = e.type; console.log(x+'=============='+(e.pageX - this.offsetLeft - (w / 2))); var aPos=[{left:0,top:-h},{left:w,top:0},{left:0,top:h},{left:-w,top:0},{left:0,top:0}]; if(eventType == 'mouseenter'){ $("#box2").css(aPos[dirNum]).stop(true,true).animate(aPos[4],200); } if(eventType == 'mouseleave'){ $("#box2").stop(true,true).animate(aPos[dirNum],200); } }); }); #box{width: 300px;height: 200px;border:1px solid #999;margin: 200px auto;position:relative;zoom:1;overflow: hidden;} #box1{height: 200px;width:300px;background-color: orange;text-align: center;line-height: 200px;} #box2{position: absolute;width:300px;height: 200px;background-color: red;text-align: center;line-height: 200px;}


#box1
#box2


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