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;    }  });});