添加catchtouchmove

    <view wx:if="{{alert}}" catchtouchmove="myCatchTouch">
        <template is="alert" data="{{alertData}}" />
    </view>

  myCatchTouch: function () {
    console.log('stop user scroll it!');
    return;
  },

针对catchtouchmove方法，原生小程序使用catchtouchmove="touchmoveHandler"，mpvue中使用@touchmove.stop="touchmoveHandler"，注意要给个空方法，否则会报警

CSS

给遮罩层加css

height: 100vh;
overflow: hidden;