js code to implement date picker

/* JS代码部分 */ 3 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 }) }, }) /* css代码部分 */ .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; } /* html代码部分 */  {{year}}-{{month}}-{{day}} 取消 确定      {{item}}年   {{item}}月   {{item}}日    /* Json */ { "navigationBarTitleText": "XXXX" }