/**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    let menuButtonObject = wx.getMenuButtonBoundingClientRect();
    wx.getSystemInfo({
      success: (res) => {
        // console.log(res.windowHeight*2)
        let statusBarHeight = res.statusBarHeight;
        const navTop = menuButtonObject.top; //胶囊按钮与顶部的距离
        const navHeight = statusBarHeight + menuButtonObject.height + (menuButtonObject.top - statusBarHeight) * 2; //导航高度
        let height = res.windowHeight * 2 - navHeight * 2 - 40 - 315 - 40;
        this.setData({
          navHeight: navHeight * 2,
          navTop: navTop * 2,
          height
        })
        this.setData({}, () => {
          // console.log(30+315+40+34+30+176)
        })
      }
    })
  },

<view style="height:{{navHeight+\'rpx\'}};" class="window_top">
    <view class="w_noback" style="top:{{navTop+10+\'rpx\'}}" bindtap="returnpre"></view>
    <view class="w_text" style="margin-top:{{navTop+\'rpx\'}}">个人主页</view>
</view>

/* pages/homework/commentHomework/index.wxss */
.window_top {
  width: 750rpx;
  box-sizing: border-box;
  text-align: center;
  position: fixed;
  left: 0;
  top: 0;
  color: #ffffff;
  z-index: 999;
  background: linear-gradient(144deg, #4FB0FA 0%, #2794E9 100%);
}

.w_text {
  height: 48rpx;
  font-size: 34rpx;
  font-family: PingFangSC-Semibold, PingFang SC;
  font-weight: 500;
  line-height: 48rpx;
}


.w_noback {
  width: 18rpx;
  height: 34rpx;
  position: absolute;
  left: 34rpx;
  background-image: url("data:image/png;base64,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");
  background-size: 100% 100%;
  background-repeat: no-repeat;
}