判断兼容ipad的js代码

<!-- for iPad begin -->
<script type="text/javascript">
(function(){
 if(!/\((iPhone|iPad|iPod)/i.test(navigator.userAgent)){return};
 document.addEventListener('mousedown',function(e){
  var ele = e.target;
  do{
   if(ele.tagName == 'A'){
    ele.target = '_self';
    return;
   };
   if(ele.tagName == 'DIV'){return};
  }while(ele = ele.parentNode);
 },false);
})();
</script>
<!-- for iPad end -->