Use
var response = UrlFetchApp.fetch("http://www.website.com/");
To fetch the html of the page. Then use something like
var cut = response.substring( str.indexOf( "<span class="A7a">" ), response.length);
var value = cut.substring(0, cut.indexOf("</span>"));
https://developers.google.com/apps-script/reference/url-fetch/url-fetch-app#fetch(String)