ios风格的时间选择插件

step1:  npm install vue -D
step2:  npm install better-scroll -D
step3:  npm install vue-ios-timer -D
step4:  import vueIosTimer from 'vue-ios-timer';
step5:  vue.use(vueIosTimer); 

initBasicData(){

	for(let i=1900; i<=2100; i++){
		this.years.push(i+'年');
	}

	for(let i=0; i<60; i++){
		if(i>0 && i<=12){
			this.monthes.push(String(i).padStart(2,'0')+'月');
		}
		if(i>0 && i<=31){
			this.days.push(String(i).padStart(2,'0')+'日');
		}
		if(i<24){
			this.hours.push(String(i).padStart(2,'0')+'时');
		}
		this.minutes.push(String(i).padStart(2,'0')+'分');
	}
	// 当type=date并且有默认值时
	if(this.type == 'date' && this.datex){
		let y = new Date(this.datex).getFullYear();
		let m = new Date(this.datex).getMonth();
		let d = new Date(this.datex).getDate();
		this.timerSelectIndex = [y-1900, m, d-1];
	// 当type=datetime并且有默认值
	}else if(this.type == 'datetime' && this.datetimex){
		let y  = new Date(this.datetimex).getFullYear();
		let m  = new Date(this.datetimex).getMonth();
		let d  = new Date(this.datetimex).getDate();
		let h  = new Date(this.datetimex).getHours();
		let min= new Date(this.datetimex).getMinutes();
		this.timerSelectIndex = [y-1900, m, d-1, h, min];
	// 当type=time并且有默认值
	}else if(this.type == 'time' && this.timex){
		let h  = Number(this.timex.split(':')[0]);
		let min= Number(this.timex.split(':')[1]);
		this.timerSelectIndex = [h, min];
	}else{
		// 当没有默认值的时候
		this.timerSelectIndex = [0,0,0,0,0];
	}
},
initTimeList(){
	if(this.type == 'datetime'){
		this.timeList.push(this.years);
		this.timeList.push(this.monthes);
		this.timeList.push(this.days);
		this.timeList.push(this.hours);
		this.timeList.push(this.minutes);
	}else if(this.type == 'time'){
		this.timeList.push(this.hours);
		this.timeList.push(this.minutes);
	}else {
		this.timeList.push(this.years);
		this.timeList.push(this.monthes);
		this.timeList.push(this.days);
	}
},

initScroll(){
	// 循环初始化多个列表
	if(!this.$refs.timerWrapper){
		return
	};
	let timerWrapper = this.$refs.timerWrapper;

	for(let i=0; i<timerWrapper.children.length; i++){

		let wheel = new Bscroll(timerWrapper.children[i],{
			wheel : {
				rotate : 25,
				selectedIndex : this.timerSelectIndex[i],
				wheelWrapperClass : 'wheel-scroll',
				wheelItemClass : 'wheel-item'
			},
			probeType : 3
		});
		this.wheels.push(wheel);
	}

	// 监听scrollEnd事件,当滚动结束以后,重新渲染天这一列
	this.wheels.forEach((wheel,i)=>{
		wheel.on('scrollEnd',(pos)=>{
			if((this.type == 'date' || this.type == 'datetime') && i != 2){
				let year    = 1900 + this.wheels[0].getSelectedIndex();
				let month   = this.wheels[1].getSelectedIndex()+1;
				let newDays = this.getDays(Number(year),Number(month));

				this.$set(this.timeList,2, newDays);
				this.wheels[2].refresh();
			}
		})
	})
},
getDays(year,month){
	// 根据年份和月份得到当月的天数
	let isLeapYear = (year % 400 == 0) || (year % 4 == 0 && year % 100 != 0); 
	let bigMonthes = [1,3,5,7,8,10,12];
	let isBigMonth = bigMonthes.indexOf(month) > -1;
	let days = [];

	for(let i=1; i<=31; i++){
		days.push(String(i).padStart(2,"0")+'日');
	};

	if(isBigMonth){
		return days;
	}else if(isLeapYear && month == 2){
		return days.splice(1,29);
	}else if(!isLeapYear && month == 2){
		return days.splice(1,28);
	}else{
		return days.splice(1,30);
	}
}

   getIndex(){
	// 返回选中的值
	let indexes = [],result = '';
	this.wheels.forEach(wheel=>{
		indexes.push(wheel.getSelectedIndex())
	});

	if(indexes.length == 3 || indexes.length == 5){
		indexes = indexes.map((item,i)=>{
			if(i==0){
				item = 1900 + item;
			}else if(i==1 || i==2){
				item = String(item+1).padStart(2,'0');
			}else{
				item = String(item).padStart(2,'0');
			}
			return item;
		})
	}else{
		indexes = indexes.map((item,i)=>{
			item = String(item).padStart(2,'0');
			return item;
		})
	}

	if(indexes.length == 2){
		result = indexes.join(':');
	}else if(indexes.length == 3){
		result = indexes.join('-');
	}else{
		result = `${indexes[0]}-${indexes[1]}-${indexes[2]} ${indexes[3]}:${indexes[4]}`;
	}
	
	this.showTimer = false;
	this.$emit('getTime',result);
   }