微信小程序实现消息框弹出动画

Page({ data: {  showModalStatus: false }, powerDrawer: function(e) {  var currentStatu = e.currentTarget.dataset.statu;  this.util(currentStatu) }, util: function(currentStatu) {  /* 动画部分 */  // 第1步：创建动画实例    var animation = wx.createAnimation({   duration: 300, //动画时长    timingFunction: "linear", //线性    delay: 0 //0则不延迟   });  // 第2步：这个动画实例赋给当前的动画实例   this.animation = animation;  // 第3步：执行第一组动画   animation.opacity(0).rotateY(100).step();  // 第4步：导出动画对象赋给数据对象储存   this.setData({   animationData: animation.export()  })  // 第5步：设置定时器到指定时候后，执行第二组动画   setTimeout(function() {   // 执行第二组动画    animation.opacity(1).rotateY(0).step();   // 给数据对象储存的第一组动画，更替为执行完第二组动画的动画对象    this.setData({    animationData: animation   })   //关闭    if (currentStatu == "close") {    this.setData({     showModalStatus: false    });   }  }.bind(this), 200)  // 显示   if (currentStatu == "open") {   this.setData({    showModalStatus: true   });  } }})

<!--button--><view class="btn bubble" bindtap="powerDrawer" data-statu="open">登录</view><!--mask--><view class="drawer_screen" bindtap="powerDrawer" data-statu="close" wx:if="{{showModalStatus}}"></view><!--content--><!--使用animation属性指定需要执行的动画--><view animation="{{animationData}}" class="drawer_box" wx:if="{{showModalStatus}}"> <!--drawer content--> <view class="drawer_title">消息框</view> <view class="drawer_content"> </view> <view class="btn_ok" bindtap="powerDrawer" data-statu="close">确定</view></view>

/*button*/.btn { width: 80%; padding: 20rpx 0; border-radius: 10rpx; text-align: center; margin: 40rpx 10%; background: #07c160; color: #fff;}/*mask*/.drawer_screen { width: 100%; height: 100%; position: fixed; top: 0; left: 0; z-index: 1000; background: #000; opacity: 0.4; overflow: hidden;}/*content*/.drawer_box { width: 650rpx; overflow: hidden; position: fixed; top: 50%; left: 0; z-index: 1001; background: #fafafa; margin: -150px 50rpx 0 50rpx; border-radius: 3px;}.drawer_title { padding: 15px; font: 20px "microsoft yahei"; text-align: center;}.text { font: 20px "microsoft yahei"; text-align: center;}.drawer_content { height: 80px; overflow-y: scroll; /*超出父盒子高度可滚动*/}.btn_ok { padding: 10px; font: 20px "microsoft yahei"; text-align: center; border-top: 1px solid #e8e8ea; color: #3cc51f;}.bottom { padding-bottom: 20px;}.bubble { position: relative; overflow: hidden;}.bubble:after { content: ""; background: #999; position: absolute; width: 750rpx; height: 750rpx; left: calc(50% - 375rpx); top: calc(50% - 375rpx); opacity: 0; margin: auto; border-radius: 50%; transform: scale(1); transition: all 0.4s ease-in-out;}.bubble:active:after { transform: scale(0); opacity: 1; transition: 0s;}