生成“年-月-日”形式的日期字符串

function showDate(time){
        var date_obj = new Date(time),
            year,
            month,
            date;

        year = date_obj.getFullYear();
        month = String(date_obj.getMonth() + 1).length === 2 ? (date_obj.getMonth() + 1) : "0" + (date_obj.getMonth() + 1);
        date = String(date_obj.getDate()).length === 2 ? (date_obj.getDate()) : "0" + date_obj.getDate();
        return (year+"/"+month+"/"+date);
    }