document.writeln("<ul><li><a href=\"\" target=\"_blank\"><font color=\"blue\">广告位</font></a></li>");
document.writeln("          <li><a href=\"\" target=\"_blank\"><font color=\"red\">广告位</font></a></li>");
document.writeln("          <li><a href=\"\" target=\"_blank\"><font color=\"blue\">广告位</font></a></li>");
document.writeln("          </ul>");