微信小程序监听页面滚动

<view class="question">
  <!-- 顶部Banner图 -->
  <view class="qBanner" >
    <image class="qBannera" src="../../../images/question/banner.png" alt=""></image>
    <image class="qBesc" src="../../../images/question/esc.png" alt="" bindtap="esc"></image>
    <text class="qBtxt">问答</text>
    <view class="sousuo">
      <image src="../../../images/question/sousuo.png"></image>
      <input type="text" placeholder="搜索" value="{{ value }}" bind:change="onChange" bindconfirm="search" />
    </view>
  </view>
  <!-- 定位 -->
  <view class="fix" wx:if="{{fixs == 0}}">
    <image  src="../../../images/question/escs.png" alt="" bindtap="esc"></image>
    <view>
      <image src="../../../images/question/sousuo.png"></image>
      <input type="text" placeholder="搜索" value="{{ value }}" bind:change="onChange" bindconfirm="search" />
    </view>
  </view>
</view>

Page({
    data: {
        fixs:1
    },
    // 监听页面
    onPageScroll(e) {
        console.log(e.scrollTop)
        if(e.scrollTop > 100){
          this.setData({
            fixs: 0
          });
        } else {
          this.setData({
            fixs: 1
          });
        }
    },
})

/* 总盒子 */
.question{
  width: 100%;
  background: #F4F4F7;
  position: relative;
}
/* 顶部banner盒子 */
.qBanner{
  width: 100%;
  height: 454rpx;
  position: relative;
}
/* 背景图 */
.qBannera{
  width: 100%;
  height: 100%;
}
/* 自定义导航栏返回按钮 */
.qBesc{
  width: 34rpx;
  height: 34rpx;
  position: absolute;
  top: 114rpx;
  left: 54rpx;
}
/* 自定义导航栏标题 */
.qBtxt{
  width: 72rpx;
  height: 50rpx;
  font-size: 36rpx;
  font-family: PingFangSC-Medium, PingFang SC;
  font-weight: 500;
  color: #232326;
  position: absolute;
  top: 108rpx;
  left: 46%;
  /* transform: translate(-0.01%,-50%); */
}
/* 搜索盒子 */
.sousuo{
  position: absolute;
  top: 186rpx;
  left: 58rpx;
  background: #FFFFFF;
  width: 640rpx;
  height: 72rpx;
  border: 2rpx solid #EFF0F4;
  border-radius: 36rpx;
}
.sousuo image{
  position: absolute;
  width: 28rpx;
  height: 28rpx;
  top: 20rpx;
  left: 20rpx;
}
.sousuo input{
  width: 90%;
  height: 100%;
  margin-left: 60rpx;
}
/* 滚动导航栏定位 */
.fix{
  width: 100%;
  height: 176rpx;
  background: #876BF4;
  position: fixed;
  top: 0;
  left: 0;
  display: flex;
  justify-content: flex-start;
  align-items: flex-end;
}
.fix image{
  width: 34rpx;
  height: 34rpx;
  margin-left: 54rpx;
  margin-bottom: 27rpx;
}
.fix view{
  width: 384rpx;
  height: 72rpx;
  margin-bottom: 8rpx;
  margin-left: 62rpx;
  position: relative;
  background: #FFFFFF;
  border-radius: 38rpx;
  border: 2rpx solid #EFF0F4;
  overflow: hidden;
}
.fix view input{
  width: 83%;
  height: 100%;
  float: right;
}
.fix view image{
  position: absolute;
  top: 20rpx;
  left: -30rpx;
  width: 28rpx;
  height: 28rpx;
}
.input-placeholder{
  font-size: 28rpx;
  font-family: PingFang-SC-Regular, PingFang-SC;
  font-weight: 400;
  color: #D2D2D5;
}