$("#cursorPlay li").on("mouseenter mouseleave",function(event){
var evType = event.type;
var direction = getDir($(this), {
x: event.pageX,
y: event.pageY
});
//  console.log("evtype:"+evType+",dir:"+direction);
moveTo($(this),direction, evType);
});
2、

direction = Math.round((((Math.atan2(y, x) * (180 / Math.PI)) + 180) / 90) + 3) % 4;
function getDir($el, coordinates){
var w = $el.width(),
h = $el.height(),
x = (coordinates.x - $el.offset().left - (w / 2)) * (w > h ? (h / w) : 1),
y = (coordinates.y - $el.offset().top - (h / 2)) * (h > w ? (w / h) : 1),
direction = Math.round((((Math.atan2(y, x) * (180 / Math.PI)) + 180) / 90) + 3) % 4;
return direction;
}

function moveTo($el, direction, type){
  var $layer = $el.find("div");
  var coord = {};
  if(type === "mouseenter"){
    switch(direction){
     case 0 :   $layer.css("top","-100%").css("left","0px");break;
    case 1 : $layer.css("left","100%").css("top","0px");break;
    case 2 : $layer.css("top","100%").css("left","0px");break;
    case 3 : $layer.css("left","-100%").css("top","0px");break;
  }
    coord = {left:0,top:0}
  }else{
  switch(direction){
    case 0 : coord = {left:0,top:'-100%'};break;
    case 1 : coord = {left:'100%',top:0};break;
    case 2 : coord = {left:0,top:'100%'};break;
    case 3 : coord = {left:'-100%',top:0};break;
  }
}
$layer.animate(coord,300);
}