微信小程序js 抽奖概率（小程序实现筛子抽奖）

<!--pages/shaizi/index.wxml-->
<view class="container">
  <view class="shaizi_box {{activeTrue}}" style="transform: rotateX({{rotateX}}deg) rotateY({{rotateY}}deg) rotateZ({{rotateZ}}deg);">
    <view class="shaizi">1</view>
    <view class="shaizi">2</view>
    <view class="shaizi">3</view>
    <view class="shaizi">4</view>
    <view class="shaizi">5</view>
    <view class="shaizi">6</view>
  </view>
  <text class="view"></text>
  <button bindtap="gamePlay">PLAY</button>
</view>

// pages/shaizi/index.js
var dingshiqi1 = 0;
var dingshiqi2 = 0;
var dingshiqi3 = 0;
Page({
 
  /**
   * 页面的初始数据
   */
  data: {
    activeTrue:"active1",
    rotateX:0,
    rotateY:0,
    rotateZ:0,
  },
 
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    
  },
  gamePlay:function(){
    let _that = this;
    this.setData({
      activeTrue:"active2",
      rotateX:0,
      rotateY:0,
      rotateZ:0,
    })
    clearInterval(dingshiqi3)
    let _posible = [
      { value: 1, x: 0, y: 0 },
      { value: 6, x: 180, y: 0 },
      { value: 3, x: 0, y: -90 },
      { value: 4, x: 0, y: 90 },
      { value: 5, x: -90, y: 0 },
      { value: 2, x: 90, y: 0 },
     ]
    // 准备抽取的随机数
    let _random = Math.floor(Math.random() * 6);
    dingshiqi1 = setTimeout(() => {
      _that.setData({
        rotateX:360,
        rotateY:250,
        rotateZ:0,
      })
     }, 0);
     dingshiqi2 = setTimeout(() => {
      _that.setData({
        rotateX:_posible[_random].x,
        rotateY:_posible[_random].y,
      })
      dingshiqi3 = setTimeout(() => {
        _that.setData({
          activeTrue:"active1",
        })
      }, 4500);
     }, 800);
  },
  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function () {
 
  },
 
  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {
 
  },
 
  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {
 
  },
 
  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {
 
  },
 
  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {
 
  },
 
  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {
 
  },
 
  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {
 
  }
})
/* pages/shaizi/index.wxss */
@keyframes rotate {
  to {
   transform: rotateX(360deg) rotateY(250deg);
  }
 }
 @keyframes shaiziCss{
  20%{
   transform: rotateX(20deg);
  }
  60%{
   transform: rotateX(20deg) rotateY(200deg);
  }
  100%{
   transform: rotateX(100deg) rotateY(1000deg) rotateZ(-100deg);
  }
 }
 .shaizi_box {
  width: 200rpx;
  height: 200rpx;
  margin: 200rpx auto;
  position: relative;
  transform-style: preserve-3d;
  animation-duration: 3s;
  animation-timing-function: linear;
  transition: all 1s;
 }
.shaizi_box.active1{
  animation: rotate 5s linear 0s infinite alternate !important;
}
.shaizi_box.active2{
  animation: shaiziCss 2s !important;
}
.shaizi_box .shaizi {
  width: 200rpx;
  height: 200rpx;
  display: flex;
  position: absolute;
  left: 0;
  top: 0;
  border: 1px solid #000;
  background: rgb(253, 250, 250);
  border-radius: 20rpx;
  font-size: 100rpx;
  color: red;
  text-align: center;
 }
 .shaizi:nth-child(1) {
  justify-content: center;
  align-items: center;
  transform: translateZ(100rpx);
 }
 .shaizi:nth-child(2) {
  justify-content: space-around;
  align-items: center;
  transform: rotateX(-90deg) translateZ(100rpx);
 }
 .shaizi:nth-child(3) {
  justify-content: space-around;
  align-items: center;
  flex-wrap: wrap;
  transform: rotateY(90deg) translateZ(100rpx);
 }
 .shaizi:nth-child(4) {
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  transform: rotateY(-90deg) translateZ(100rpx);
 }
 .shaizi:nth-child(5) {
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  transform: rotateX(90deg) translateZ(100rpx);
 }
 .shaizi:nth-child(6) {
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  transform: rotateX(-180deg) translateZ(100rpx);
}