简单效果

//跟随鼠标

$(window).mousemove(function () {
             //  document.createElement("<div id=dsa></div>");
               $("#id").offset({ left: event.x, top: event.y });
           })

 

//编辑

$("table tr td").click(function () {

              if ($(this).find("input[type='text']").length < 1) {
                  var text = $(this).text();
                  $(this).attr("innerHTML", "");
                  $(this).append("<input type=text  value=" + text + "/>");
                  $(this).find("input[type='text']").select();
              }

          })

 

//跟随滚动条

//document.documentElement.scrollTop
//document.body.scrollTop

$(window).scroll(function () {

             var topScroll = window.pageYOffset;
             var topDiv = "70px";
             var top = topScroll + parseInt(topDiv);

             $("#id").animate({ "top": top }, 500);

         })