提示：

 

 

 <div class="global-loading"> </div>

css:less 

<style lang="less">
.global-loading {
  background-color: red;
  height: 10px;
  position: fixed;
  z-index: 999;
  width: 0;
  animation: grow 2s infinite forwards;

}

@keyframes grow {
  from {
    width: 0;
  }

  to {
    width: 100%;
  }
}
</style>