设置js日期的正确姿势

  var mydate = new Date();
        var curyear = mydate.getFullYear();
        var curmonth = mydate.getMonth();
        var curday = mydate.getDate();
        var currentday = new Date(curyear, curmonth, curday);
        var firstd = new Date(currentday.getTime() - 24 * 60 * 60 * 1000);
        var lastd = new Date(currentday.getTime() + 24 * 60 * 60 * 1000);

        mini.get("begintime").setText(firstd.getFullYear() + '-' + DateToString(firstd.getMonth() + 1) + '-' + DateToString(firstd.getDate()));
        mini.get("endtime").setText(lastd.getFullYear() + '-' + DateToString(lastd.getMonth() + 1) + '-' + DateToString(lastd.getDate()));

  function DateToString(val) {
            if (val.toString().length == 1) {
                return '0' + val.toString()
            }
        return val;
        }

以上的内容为设置当前日期的前一天和后一天，当月的日期也是可以参考的。