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我正在尝试在滚动时向标题添加一个类并将其删除。但是失败。每次滚动时都会添加该类。因此，如果 ScrollY === 100，则该元素已添加类 100 次。如何使它只添加一次，并在 scrollY < 100 时将其删除？

我究竟做错了什么？

代码笔

<div id="app">
  <v-app>
    <v-content>
      <v-container fluid fill-height class="priceContainer">
      <v-layout row wrap align-center justify-center>
        <v-flex xs12 sm12  text-center>
         <v-toolbar
      :clipped-left="$vuetify.breakpoint.lgAndUp"
      class="elevation-0 "
      fixed
      temporary
      @scroll="handleSCroll"
    >
      <v-toolbar-side-icon @click.stop="drawer = !drawer" ></v-toolbar-side-icon>
      <v-toolbar-title style="width: 300px" class="ml-0 pl-3">
        <span class="PriceLogoTitle hidden-sm-and-up">ELS</span>
        <span class="PriceLogoTitle hidden-sm-and-down">ELS</span>
      </v-toolbar-title>
      <v-spacer></v-spacer>
      <!-- ?????? ????? -->
      <v-btn  class="navBtnEnter" flat>Enter <v-icon  right >account_box</v-icon></v-btn>
      <!-- ?????? ????? ????? -->
    </v-toolbar>
        </v-flex>   


        <!--  -->

      </v-layout>
    </v-container>
    </v-content>
  </v-app>
</div>


.priceContainer{ …