Jquery网页内滑动缓冲导航的实现代码

<script src="http://apps.bdimg./libs/jquery/1.7.2/jquery.min.js"></script> 
<script type="text/javascript">
jQuery.fn.anchorGoWhere = function(options){
  var obj = jQuery(this);
  var defaults = {target:0, timer:500};
  var o = jQuery.extend(defaults,options);
  obj.each(function(i){
   jQuery(obj[i]).click(function(){
    var _rel = jQuery(this).attr("href").substr(1);
    switch(o.target){
     case 1:
      var _targetTop = jQuery("#"+_rel).offset().;
      jQuery("html,body").animate({scrollTop:_targetTop},o.timer);
      break;
     case 2:
      var _targetLeft = jQuery("#"+_rel).offset().left;
      jQuery("html,body").animate({scrollLeft:_targetLeft},o.timer);
      break;
    }
   return false;
   });
  });
 };
 
$("#mybtn").anchorGoWhere({target:1}); //这里是点击按钮的ID
</script>