将此 iframe 的 height 属性更改为 1260:
<iframe name="googleSearchFrame" src="http://www.google.com/cse?c_id=2&q=togitsu&cx=000096980916426724425:keok8sbpuem&cof=FORID:10&ie=UTF-8&ad=n9&num=10&rurl=http%3A%2F%2Fwww.town.togitsu.nagasaki.jp%2Fsearch%2Fpub%2FDefault.aspx%3Fc_id%3D2%26q%3Dtogitsu%26cx%3D000096980916426724425%3Akeok8sbpuem%26cof%3DFORID%3A10%26ie%3DUTF-8&siteurl=http%3A%2F%2Fstackoverflow.com%2Fquestions%2F10647487%2Fgoogle-custom-search-create-a-huge-blank-space-at-the-bottom" frameborder="0" width="795" height="1260" marginwidth="0" marginheight="0" hspace="0" vspace="0" allowtransparency="true" scrolling="no"></iframe>
这很可能是由用于搜索的 JavaScript 代码动态添加的。如果是这种情况,您需要使用 JavaScript 动态更改高度:
$(document).ready(function() {
$('[name="googleSearchFrame"]').attr("height","1260");
});