How does Vue refresh a specified region?

I used v-for to generate a list of cards and wanted to use el-switch to select which cards to display and which not. How do I refresh v-for to display the new data in the update() function called to change the el-switch state?

<div class="section" >
            <el-switch class="switch" v-model="switchvalue1" active-text="显示生效记录"
                       inactive-text="显示所有历史记录" @change="update()"></el-switch>
            <div class="list_section">
              <el-row :span="5" v-for="item in recommend_content" :key="item.id" offset="1"
                      style="margin-left:0%;margin-top:1.5%;width: 95%;">
                <el-card :body-style="{ padding: '0px' }" @click.native="pushToUrl(item.id)">
                </el-card>
              </el-row>
            </div>
          </div>