jQuery 获取页面li数组并删除不在数组中的key

var getSaleModels = function(brand_id){
if(brand_id){
var li = $(".pinpai-chexing"+brand_id+" li");
var arr = new Array();
if (li.length > 0){
li.each(function(index, element) {
arr.push($(element).children("a").attr("data-value"));
});
}
}
return arr;
}

//获取车型
var getModel = function (id){
var arr = getSaleModels($("#brand_id").attr("data-value"));
$.getJSON("/interface/CarBase/getTuangouModels/",{id:$("#brand_id").attr("data-value")},function(json){
var models = $(".models");
var option = "";
$(models).find("li").empty(); //清空原有的选项
if(json){
$.each(json.data,function(index,array){
//删除停售的车型
if($.inArray(array['model_id'],arr)!=-1){
if(!index){
$("#model_id").attr("data-value",array['model_id']);
$("#model_id").text(array['model']);
}
option += "<li data-value='"+array['model_id']+"'";
option += ">"+array['model']+"</li>";
}
});
models.append(option); 
}
});
return false;
}