[url]https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js[/url] 
 
var datas = "<div class='content'><h1>This is a heading</h1><p>This is a paragraph of text.</p><p><strong>Note:</strong> If you don't escape 'quotes' properly, it will not work.</p></div><div class='isim'>deneme</div>";
var name = $("<div>" + datas + "</div>").find(".isim").text();
console.log(name);