使用ajax方法date的参数传递不到servelet类中

ajax方法中的date参数，在dibugg中返回的一直都是null
jsp代码

 function tijiao1(obj){
           var val = $(obj).val();
          $.ajax({
                  url: "${pageContext.request.contextPath}/servlet",
                  async: true,
                  date:"name="+val,//得到输入框的value值
                  type:"POST",
                  dataType: "text",
                  success:function (date){
                      $("#span1").html(date).css("color","red")
                  },
                 }
              );
        }

使用request.getparament()方法来获取name，但是一直取不到，一直都为null，

@WebServlet("/servlet")
public class NameVerifiction extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");//name一直为null
        NameverifictionService a=new NameverifictionService();
        boolean b = a.tijiao1(name);
        if (!b){
            resp.setContentType("text/html;charset=utf-8");
            resp.getWriter().println("用户名错误");
        }
    }

ajax里面 date->data

    $.ajax({
        url:"",
        data:{name:val},
        success:function(res){
            console.log(res)
        }
    })