微信小程序实现点击卡片翻转效果

.main {
 position: absolute;
 top: 50%;
 left: 50%;
 width: 300px;
 height: 300px;
 transform: translate(-50%,-50%);
 -webkit-perspective: 1500;//子元素获得透视效果 
 -moz-perspective: 1500;
}
 
.box {
 position: absolute;
 top: 0;
 left: 0;
 width: 300px;
 height: 300px;
 transition: all 1s;
 backface-visibility: hidden;
 border-radius: 10px;
 cursor: pointer;
}
.box image{
 border-radius: 10px;
 width: 100%;
 height: 100%;
}
.b1{
 background:skyblue;
}
.b2 {
 background:tomato;
 transform: rotateY(-180deg);
}
js: 
Page({
 data: {
  animationMain:null,//正面
  animationBack:null,//背面
 },
 rotateFn(e) {
  var id = e.currentTarget.dataset.id
  this.animation_main = wx.createAnimation({
    duration:400,
    timingFunction:'linear'
   })
   this.animation_back = wx.createAnimation({
    duration:400,
    timingFunction:'linear'
   })
  // 点击正面
 
  if (id==1) {
   this.animation_main.rotateY(180).step()
   this.animation_back.rotateY(0).step()
   this.setData({
    animationMain: this.animation_main.export(),
    animationBack: this.animation_back.export(),
   })
  }
  // 点击背面
  else{
   this.animation_main.rotateY(0).step()
   this.animation_back.rotateY(-180).step()
   this.setData({
    animationMain: this.animation_main.export(),
    animationBack: this.animation_back.export(),
   })
  }
 },
})