小程序开发踩坑：页面窗口定位（相对于浏览器定位）（推荐）

<view class="pageHead">
 <view class="hedTop">
  <view class="headTab">
  <view class="tablab">违章条数</view>
  <view class="tabbody">6</view>
  </view>
  <view class="headTab">
  <view class="tablab">罚款金额</view>
  <view class="tabbody">1200</view>
  </view>
  <view class="headTab">
  <view class="tablab">违章扣分</view>
  <view class="tabbody">12</view>
  </view>
 </view>
 <view class="headBot">
  <view class="hedBtnTab {{currentTab==0 ? 'activeNav':''}}" data-current="0" bindtap="swichNav">全部</view>
  <view class="hedBtnTab {{currentTab==1 ? 'activeNav':''}}" data-current="1" bindtap="swichNav">可办理</view>
  <view class="hedBtnTab {{currentTab==2 ? 'activeNav':''}}" data-current="2" bindtap="swichNav">扣车主分</view>
 </view>

/*--页面fixed定位层--*/
.pageHead{
 position: fixed;
 top: 0;
 width:100%;
 background-color:#fff;
	 z-index: 10;
}