(function (jQuery, Domain) {
    var $download = jQuery(".download");
    var bookId = $download.attr("bookId") || jQuery("body").attr("bookId");
    var uri = Domain.dlHostName + "/book/" + bookId + ".txt";
    var btn = jQuery('<a class="button" href="' + uri + ' " download="' + jQuery("body").attr("bookName") + '">下载本书</a>');
    $download.replaceWith(btn);
    $download = null;
})(unsafeWindow.jQuery, unsafeWindow.Domain);