基于此脚本:
var W=0, H=0, X=0, Y=0;
$(".iframe").each(function(i,el){
   W = $(el).width();
   H = $(el).height();
   X = $(el).position().left;
   Y = $(el).position().top;
   $(this).after('<div class="overlay" />');
    $(this).next('.overlay').css({
        width: W,
        height: H,
        left: X,
        top: Y        
    });
});
// TRACK MOUSE POSITIONS (the overlay will prevent clicks on iframe page)
var mx = 0, my = 0;
$('.overlay').on('mousemove click',function(e){
    mx = e.clientX - $(this).position().left;
    my = e.clientY - $(this).position().top;
    if(e.type==='click'){
        alert('clicked at: X='+mx+' Y='+my)
    }        
});
是否可以在 X 秒后自动删除不可见的 div?
谢谢