修改提示

src/pages/shms/certs/index.vue

@@ -4,7 +4,7 @@
       <el-select @change="changes" v-model="value" size="small" clearable>
         <el-option v-for="item in options" :key="item.id" :label="item.english_name" :value="item.id"> </el-option>
       </el-select>
-      <div class="down-btn" @click="$refs.html2Pdf.generatePdf()">{{ $t('shmsLang.downloadBtn') }}</div>
+      <div class="down-btn" @click="downPdf">{{ $t('shmsLang.downloadBtn') }}</div>
     </div>
     <template v-if="imgUrl">
       <vue-html2pdf
@@ -119,6 +119,16 @@ export default {
         window.open(this.pdfUrl)
       }
     },
+    downPdf() {
+      if (this.pdfUrl) {
+        this.$refs.html2Pdf.generatePdf()
+      } else {
+        this.$message({
+          message: 'No certificate, unable to download',
+          type: 'warning'
+        })
+      }
+    },
     changes() {
       this.imgUrl = ''
       this.pdfUrl = ''