如何在jquery中取消拖动动作

Question

我希望在鼠标光标没有完全转到下一个tr时取消拖动动作。

 $('#tableAppointment tbody tr td:nth-child(2)').mousedown(function (ev)
    {
       //mousedown code
    });
 $('#tableAppointment tbody tr td:nth-child(2)').mousemove(function (ev)
    {
       //mousemove code
    });
 $('#tableAppointment tbody tr td:nth-child(2)').mouseup(function (ev)
    {
       //mouseup code
    });