function formatDate(timestamp){
var test = new Date(parseInt(timestamp) * 1000);
var $year = test.getFullYear();
var $month = parseInt(test.getMonth())+1;
var $day = test.getDate();
//返回格式一
var f_date1 = $year+"-"+$month+"-"+$day;
return f_date1;
//返回格式二
var f_date2 = $year+"年"+$month+"月"+$day+"日";
return f_date2;
} var stmp = '1456816515';
formatDate(stmp);