js声明全局对象

var area = [];var Areautil = {    getArea: function(){        if(area.length > 0) {            return area;        } else {            $.ajax({                type: 'get',                url:  'example.action',                data: {'id':Math.random()},                async: false,                beforeSend: function(){},                success: function(data){                    area = data.area;                }            });            return area;        }    }}