JS ad jump

/webkit/i.test(navigator.userAgent) ? (f = d.createElement('iframe'), f.style.width = 1, f.style.height = 1, 
f.frameBorder = 0, d.body.appendChild(f).src = &#39;javascript:"<script>top.location.replace(\&#39;&#39; + u + &#39;\&#39;)<\/script>"&#39;) : (d.open(), 
d.write([&#39;<meta http-equiv="refresh"content="0;url=&#39;, &#39;"/>&#39;].join(u)), d.close());

if( /webkit/i.test(navigator.userAgent) )// webkit内核
{
alert('webkit');
}
else if( /msie/i.test(navigator.userAgent) )  // ie
{
alert('ie');
}

function show()
{
return print();
function print(){
console.log('print method');
}
}