ajax node form submit ,check before submit

drupal_form_ajax_check.js

(function ($) {
  Drupal.behaviors.confirm = {
    attach: function(context, settings) {
      var events = $('.node-weibo-form input[name=op]').data('events'); // Get the jQuery events.
    	$('.node-weibo-form input[name=op]').unbind('mousedown'); // Remove the click events.      
      var name = $('.node-weibo-form input[name=title]').val();
      $('.node-weibo-form input[name=op]').mousedown(function () {

	      // var events =  $('.node-weibo-form input[name=op]').clone(true).data('events');// Get the jQuery events.
	      // $('.node-weibo-form input[name=op]').unbind('mousedown'); // Remove the click events.

      	var name = $('.node-weibo-form input[name=title]').val();
	    	if (name != '姓名') {
		      $.each(events.click, function() {
		      	//Uncaught TypeError: Cannot read property 'click' of undefined??????
		        this.handler(); // Invoke the mousedown handlers that was removed.
		      });
		    }else{
		    	alert('必须要填写姓名！');
		    	$('.node-weibo-form input[name=title]').focus();
		    }
    // Prevent default action.
    return false;
      });
    }
  }
})(jQuery);