js中

  containerTap: function (res) {
    console.log(res.touches[0]);
    var x = res.touches[0].pageX;
    var y = res.touches[0].pageY + 85;
    this.setData({
      rippleStyle: ''
    });
    this.setData({
      rippleStyle: 'top:' + y + 'px;left:' + x + 'px;-webkit-animation: ripple 0.4s linear;animation:ripple 0.4s linear;'
    });
  }

wxml中

<view>

<view class="ripple" style="{{rippleStyle}}"></view>

<view class="container" bindtouchstart="containerTap"></view>

</view>

wxss中

.container{
    width:100%;
    height:500px;
}
.ripple {
    background-color: rgba(50%,70%, 60%, 0.6);
    border-radius: 100%;
    height:10px;
    width:10px;
    margin-top: -90px;
    position: absolute;
    -webkit-transform: scale(0);
}
@-webkit-keyframes ripple {
    100% {
    -webkit-transform: scale(12);
    transform: scale(12);
    background-color: transparent;
    }
}

点击屏幕后会出现这个