JQuery 操作 iframe

$("iframe#Main", top.document).contents().find("#id");

var top = $("iframe#Main", top.document).contents().scrollTop();//取
$("iframe#Main", top.document).contents().scrollTop(top + 10);//设置

$(parent.document).find("#id");
$(top.document).find("#id");

        function parentIframe() {
            $(parent.document).find("iframe").each(function(index, ele) {
                if (window.location.href.indexOf($(ele).attr("src")) >= 0) { 
                    return $(ele);
                } 
            }); 
        }