jquery提交form表单时禁止重复提交的方法

$(document).ready(function() {
  $(form).submit(function() {
    if(typeof jQuery.data(this, "disabledOnSubmit") == undefined) {
      jQuery.data(this, "disabledOnSubmit", { submited: true });
      $(input[type=submit], input[type=button], this).each(function() {
        $(this).attr("disabled", "disabled");
      });
      return true;
    }
    else
    {
      return false;
    }
  });
});