需求：页面头部导航栏固定，出现横向滚动时，导航栏跟随滚动

<template>
    <div class="view-header" id="view-header-fixed" :class="{ 'view-header-scroll': appScroll }">
        <div class="header-container"></div>
    </div>
</template>

<script>
  mounted() {
    // 关键
    window.onscroll = function() {
      var sl = -Math.max(document.body.scrollLeft, document.documentElement.scrollLeft) // 获取滑动距离
      document.getElementById('view-header-fixed').style.left = sl + 'px' // 设置元素的偏离距离
    }
  }
</script>

<style scoped lang="scss">
.view-header {
  position: fixed;
  top: 0;
  left: 0;
  background: white;
  height: 80px;
  width: 100%;
  min-width: 1440px;
  z-index: 1001;
}
</style>