var name_value= [{"name":"闵行区","value":20},{"name":"浦东新区","value":30},{"name":"杨浦区","value":10}]            var list = new Array();            for(var i in name_value){            list.push(name_value[i].value);            }            list.sort(function(num1,num2){            return num1-num2;            })            var maxcnt= eval(list[list.length-1]);