Get the Meta Content using Javascript

Here is the code for retrieving the Meta Keywords, Description using Javascript.

var destination = window.location.href;
var meta_title = '',meta_description = '';
       var meta = document.getElementsByTagName("meta");
       for( var x in meta )
       {
               if(/^title$/i.test(meta[x]["name"]))
                       meta_title = meta[x]["content"];
               if(/^description$/i.test(meta[x]["name"]))
                       meta_description = meta[x]["content"];
       }