datePicker日期选择器
当我们要求只能选择今天之前的日期范围时，可以通过配置快捷选择中的disabledDate属性来控制。
pickerOptions: {
shortcuts: [],
disabledDate(time) {
return time.getTime() > Date.now() - 8.64e7;
},
},
同样可以配置月份选择器：
disabledDate: (time) => {
var date = new Date();
var year = date.getFullYear();
var month = date.getMonth() + 1;
if (month >= 1 && month <= 9) {
month = "0" + month;
}
var currentdate = year.toString() + month.toString();
var timeyear = time.getFullYear();
var timemonth = time.getMonth() + 1;
if (timemonth >= 1 && timemonth <= 9) {
timemonth = "0" + timemonth;
}
var timedate = timeyear.toString() + timemonth.toString();
return currentdate < timedate;
},