fix

src/views/OrderTrack/goodsDetail.vue

@@ -202,13 +202,13 @@ export default {
       console.log(this.selectedLang);
 
       let pdf_url = ""
-      if( selectedLang == 1 ){
+      if( this.selectedLang == 1 ){
         pdf_url = "/api/purContract/pdf";
       }
-      if( selectedLang == 2 ){
+      if( this.selectedLang == 2 ){
         pdf_url = "/api/purContract/pdfHk";
       }
-      if( selectedLang == 3 ){
+      if( this.selectedLang == 3 ){
         pdf_url = "/api/purContract/pdfUs";
       }