JS ad jump

A piece of advertising code I saw on the Internet

Js code

/webkit/i.test(navigator.userAgent) ? (f = d.createElement(&#39;iframe&#39;), 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());

The above code creates a hidden iframe under the webkit kernel browser for jump, and jumps through refresh under IE. It involves a lot of knowledge points of.

Browser Judgment

/webkit/i.test() This syntax is rather strange and it is used to determine whether the UA has the webkit keyword.

Js code

if( /webkit/i.test(navigator.userAgent) )// webkit kernel

{

alert('webkit');

}

else if( /msie/i .test(navigator.userAgent) ) // ie

{

alert('ie');

}

Javascript anonymous functions can still play like this

Js code

function show ()

{

  return print();

  function print(){

              console.log('print method');