JQuery对象转成js对象:
bind绑定事件解决闭包
tr.bind("dblclick", {
index: i
}, function(event){
$("#deptno").val(ary[event.data.index].deptno);
$("#dname").val(ary[event.data.index].dname);
$("#dloc").val(ary[event.data.index].loc);
});