//品牌地标弹出层(function($){$.fn.bgIframe = $.fn.bgiframe = function(s) {    if ( $.browser.msie && /6.0/.test(navigator.userAgent) ) {        s = $.extend({            top     : 'auto', // auto == .currentStyle.borderTopWidth            left    : 'auto', // auto == .currentStyle.borderLeftWidth            width   : 'auto', // auto == offsetWidth            height  : 'auto', // auto == offsetHeight            opacity : true,            src     : 'javascript:false;'        }, s || {});        var prop = function(n){
   return n&&n.constructor==Number?n+'px':n;},            html = '';                    return this.each(function() {            if ( $('> iframe.bgiframe', this).length == 0 )                this.insertBefore( document.createElement(html), this.firstChild );        });    }    return this;};})(jQuery);jQuery.fn.selectCity = function(targetId) {    var _seft = this;    var targetId = $(targetId);    this.click(function(){        var A_top = $(this).offset().top + $(this).outerHeight(true);  //  1        var A_left =  $(this).offset().left;        targetId.bgiframe();        targetId.show().css({
    "position":"absolute","top":A_top+"px" ,"left":A_left+"px"});    });    targetId.find(".tagClose").click(function(){        targetId.hide();    });    $(document).click(function(event){        if(event.target.id!=_seft.selector.substring(1)){            targetId.hide();            }    });    targetId.click(function(e){        e.stopPropagation(); //  2    });    return this;}$("#txtName").selectCity("#questionTypeDivBox");

 

原来上面那段代码就是jquery.bgiframe.js。可以让弹出层在选择框之上显示。Jquery.fn.selectCity这个点击外面弹出层就消失的代码。