flex布局实现每行固定数量+自适应布局

 <div class="template" v-for="(item,templateIndex) in 7">
              <div @click="useTemplate()" v-touch:long="(e)=>touchin(groupIndex,templateIndex)">
                <img class="icon" src="../../../assets/home-page/templateIcon.png" alt />
                <div class="templateName">模板名称</div>
              </div>
            </div>

//父盒子，设置为
.templateItem {
  width: 100%;
 
  text-align: center;
  display: flex;
  align-content: flex-start;
  flex-flow: row wrap;
}

//子盒子，设置为
 .template {
  flex: 0 0 25%;
  margin-bottom: 20px;
}