<view class="box">
 <view class="boxsub {{luckynum==index?'luck':''}}" wx:for='{{box}}' style="{{index>0&&index<4?'top:0;left:'+index*140+'rpx;':(index>3&&index<8?'right:0;top:'+((index-4)*100)+'rpx;':(index>7&&index<12?'bottom:0;right:'+(index-7)*140+'rpx;':(index>11&&index<14?'left:0;bottom:'+(index-11)*100+'rpx;':'')))}} {{index=='4'?'top:0;':''}} {{index=='11'?'left:0;':''}} " wx:key=''>
  <text class='boxcontent' style='{{item.name.length>6?"line-height:40rpx;margin-top:10rpx;":"line-height:100rpx;"}}'>{{item.name}}</text> 
 
 </view>
 <view class="lucky" catchtap="luckyTap">
 <text class="taplucky">點擊抽獎</text>
 <text class="howMany">您還有<text class="howMany_num" >{{howManyNum}}</text>次抽獎機會</text>
 </view>
</view>
<view class="explain">

</view>

.box{
 margin:20rpx 25rpx;
 height: 400rpx;
 width: 698rpx;
 /*border:1px solid #ddd;*/
 position: relative;
 /*box-sizing: border-box;*/
}
.boxsub{
 width: 140rpx;
 height: 100rpx;
 /*border: 1px solid #f00;*/
 box-sizing: border-box;
 position: absolute;
 background: #ff6100;
 border: 1rpx solid #fff;
 
}
.boxcontent{
 text-align: center;
 font-size: 26rpx;
 display: block;
 color: #fff;
}
.lucky{
 width: 300rpx;
 height:130rpx;
 background:#ff6100;/* #ff6100;007FFF*/
 position: absolute;
 left: 0;
 bottom: 0;
 right: 0;
 top: 0rpx;
 margin: auto;
}

.lucky:active{
 opacity: 0.7;
}
.taplucky{
 display: block;
 text-align: center;
 font-size: 30rpx;
 line-height: 50rpx;
 height: 50rpx;
 color: #fff;
 margin-top: 20rpx;
}
.howMany{
 display: block;
 text-align: center;
 font-size: 26rpx;
 color: #fff;
 line-height: 40rpx;
 height: 40rpx;
}
.howMany_num{
 color:#007FFF;
 font-size:32rpx;
 line-height:40rpx;
 padding:0 10rpx;
}
.luck{
 opacity: 0.5;
 background: #ff6100;
}

var time = null;//setTimeout的ID，用clearTimeout清除
Page({
 data: {
 box: [{
 name:'100積分'
 }, {
 name: '10元優(yōu)惠券\n滿100可用'
 }, {
 name: '60積分'
 }, {
 name: '30積分'
 }, {
 name: '50積分'
 }, {
 name: '30元優(yōu)惠券\n滿120可用'
 }, {
 name: '100積分'
 }, {
 name: '200積分'
 }, {
 name: '10積分'
 }, {
 name: '50積分'
 }, {
 name: '40積分'
 }, {
 name: '50優(yōu)惠券滿500可用'
 }, {
 name: '60積分'
 }, {
 name: '70積分'
 }],
 luckynum:0,//當(dāng)前運動到的位置，在界面渲染
 howManyNum:10,//抽獎的剩余次數(shù)
 content:{
 index: 0, //當(dāng)前轉(zhuǎn)動到哪個位置，起點位置
 count: 0, //總共有多少個位置
 speed: 50, //初始轉(zhuǎn)動速度
 cycle: 3*14, //轉(zhuǎn)動基本次數(shù)：即至少需要轉(zhuǎn)動多少次再進入抽獎環(huán)節(jié)，這里設(shè)置的是轉(zhuǎn)動三次后進入抽獎環(huán)節(jié)
 },
 prize:0,//中獎的位置
 luckytapif:true//判斷現(xiàn)在是否可以點擊
 },
 //點擊抽獎
 luckyTap:function(){
 var i=0,
 that=this,
 howManyNum = this.data.howManyNum,//剩余的抽獎次數(shù)
 luckytapif = this.data.luckytapif,//獲取現(xiàn)在處于的狀態(tài)
 luckynum = this.data.luckynum,//當(dāng)前所在的格子
 prize =Math.floor(Math.random()*14) ;//中獎序號,隨機生成
 if (luckytapif && howManyNum>0){//當(dāng)沒有處于抽獎狀態(tài)且剩余的抽獎次數(shù)大于零，則可以進行抽獎
 console.log('prize:'+prize);
 this.data.content.count=this.data.box.length;
 this.setData({
 howManyNum:howManyNum-1//更新抽獎次數(shù)
 });
 this.data.luckytapif=false;//設(shè)置為抽獎狀態(tài)
 this.data.prize = prize;//中獎的序號
 this.roll();//運行抽獎函數(shù)
 } else if (howManyNum == 0 && luckytapif){
 wx.showModal({
 title: '',
 content: '您的抽獎次數(shù)已經(jīng)沒有了',
 showCancel:false
 })
 }
 },
//抽獎
 roll:function(){
 var content=this.data.content,
 prize = this.data.prize,//中獎序號
 that=this;
 if (content.cycle - (content.count-prize)>0){//最后一輪的時間進行抽獎
 content.index++;
 content.cycle--;
 this.setData({
 luckynum: content.index%14 //當(dāng)前應(yīng)該反映在界面上的位置
 });
 setTimeout(this.roll, content.speed);//繼續(xù)運行抽獎函數(shù)
 }else{
 if (content.index < (content.count*3 + prize)){//判斷是否停止

 content.index++; 
 content.speed += (550 /14);//最后一輪的速度，勻加速，最后停下時的速度為550+50
 this.data.content=content;
 this.setData({
  luckynum: content.index % 14
 });
 console.log(content.index, content.speed);//打印當(dāng)前的步數(shù)和當(dāng)前的速度
 setTimeout(this.roll,content.speed);
 }else{
 //完成抽獎，初始化數(shù)據(jù)
 console.log('完成');
 content.index =0;
 content.cycle = 3 * 14;
 content.speed = 50;
 this.data.luckytapif = true;
 clearTimeout(time);
 wx.showModal({
  title: '',
  content: '恭喜你抽到了'+that.data.box[prize].name,
  showCancel:false
 })
 }
 }
 },
 onLoad: function (options) {
 
 },
 onReady: function () {
 
 },
 onShow: function () {
 
 },
 onHide: function () {
 
 },
 onUnload: function () {
 
 }
})