微信小程序的时间控件picker-view

<view class="time_screens">
<view style="text-align:center;color:#45BCE8">{{year}}-{{month}}-{{day}} {{hour}}:{{minute}}<label style="float:right;margin-right:10px;">确定</label></view>
<view style="border-top:1px solid #45BCE8;height:25px;font-size:14px;">
<view class="time-title">年</view>
<view class="time-title">月</view>
<view class="time-title">日</view>
<view class="time-title">时</view>
<view class="time-title">分</view>
</view>
<picker-view indicator-style="height: 50px;" style="width: 100%; height: 300px;" value="{{value}}" bindchange="bindChange">
<picker-view-column class="picker-text">
<view wx:for="{{years}}" style="line-height: 50px">{{item}}</view>
</picker-view-column>
<picker-view-column class="picker-text">
<view wx:for="{{months}}" style="line-height: 50px">{{item}}</view>
</picker-view-column>
<picker-view-column class="picker-text">
<view wx:for="{{days}}" style="line-height: 50px">{{item}}</view>
</picker-view-column>
<picker-view-column class="picker-text">
<view wx:for="{{hours}}" style="line-height: 50px">{{item}}</view>
</picker-view-column>
<picker-view-column class="picker-text">
<view wx:for="{{minutes}}" style="line-height: 50px">{{item}}</view>
</picker-view-column>
</picker-view>
</view>

.time-title{
float:left;width:20%;text-align:center;color:#45BCE8
}
.picker-text{
text-align:center;
}
/*mask*/
.time_screens {

width: 100%;

position: fixed;
bottom: 0;
left: 0;
z-index: 1000;
opacity: 0.5;
overflow: hidden;
}

const date = new Date()
const years = []
const months = []
const days = []
const hours = []
const minutes = []
var thisMon = date.getMonth();
var thisDay = date.getDate();

for (let i = 2017; i <= date.getFullYear()+1; i++) {
years.push(i)
}

for (let i = date.getMonth(); i <= 11; i++) {
var k = i;
if (0 <= i && i < 9) {
k = "0" + (i+1);
}else{
k = (i + 1);
}
months.push(k)
}
if (0 <= thisMon && thisMon<9){
thisMon = "0" + (thisMon + 1);
}else{
thisMon = (thisMon + 1);
}
if (0 <= thisDay && thisDay<10){
thisDay ="0"+thisDay;
}

var totalDay = mGetDate(date.getFullYear(), thisMon);
for (let i = 1; i <= 31; i++) {
var k = i;
if (0 <= i && i < 10) {
k = "0" + i
}
days.push(k)
}

for (let i = 0; i <= 23; i++) {
var k=i;
if(0<=i&&i<10){
k="0"+i
}
hours.push(k)
}
for (let i = 0; i <= 59; i++) {
var k = i;
if (0 <= i && i < 10) {
k = "0" + i
}
minutes.push(k)
}
function mGetDate(year, month) {
var d = new Date(year, month, 0);
return d.getDate();
}
Page({
data: {
years: years,
year: date.getFullYear(),
months: months,
month: thisMon,
days: days,
day: thisDay,
value: [1,thisMon-1,thisDay-1,0,0],
hours: hours,
hour: "00",
minutes: minutes,
minute: "00",
},
bindChange: function (e) {
const val = e.detail.value
this.setData({
year: this.data.years[val[0]],
month: this.data.months[val[1]],
day: this.data.days[val[2]],
hour: this.data.hours[val[3]],
minute: this.data.minutes[val[4]],
})
var totalDay = mGetDate(this.data.year, this.data.month);
var changeDate=[];
for (let i = 1; i <= totalDay; i++) {
var k = i;
if (0 <= i && i < 10) {
k = "0" + i
}
changeDate.push(k)
}
this.setData({
days: changeDate
})
},

})