错误日志：TypeError: ejs:74
    72|                 <a href="pros.html?pageSize=8"><%= language.proTitle %></a>
    73|                 <i class="el-icon-arrow-right"></i>
 >> 74|                 <a href="pros.html?pageSize=8&productClassifyId=<%= productDetail.data.productClassifyId %>" class="pro-detail-index-name-title"><%= (productDetail && productDetail.data && productDetail.data.classifyName) ? productDetail.data.classifyName : 'Ferrosilicon' %></a>
    75|                 <i class="el-icon-arrow-right"></i>
    76|                 <a href="pro-detail.html" class="lastA"><%= (productDetail && productDetail.data && productDetail.data.productName) ? productDetail.data.productName : 'Ferrosilicon 75' %></a>
    77|             </div>

Cannot read properties of undefined (reading 'productClassifyId')