layui当前日期往后不可选择

function max() {
   var nowDate = new Date();
   return nowDate.getFullYear() + "-" + (nowDate.getMonth() + 1) + "-" + nowDate.getDate();
}

layui.use('laydate', function() {
    var laydate = layui.laydate;
    laydate.render({
        elem: "#ix608 input",
        type: '',
        format: 'yyyyMMdd',
        range: '~',
        value: YEARMTH,
        max: max(),
        done: function(value, date, startDate) {
        }
    })
})