客户端打印优化

src/js/main.js

@@ -159,7 +159,7 @@ let main ={
           }
         },
         {
-          label:'版本号:2.1.9',
+          label:'版本号:2.2.0',
           icon: respath + path.sep+ "static"+ path.sep+"images"+ path.sep+"paste.png",
         },]
     });

src/js/setting/print_monitor.js

@@ -73,13 +73,20 @@ let print_monitor={
                 if(err){
                   log.error("获取打印机缓存失败");
                 }else {
-                  let printer_json = JSON.parse(data);
-                  defaultPrinter = printer_json.printer_name;
-                  data = {
-                    listPrinter: listPrinter,
-                    defaultPrinter: defaultPrinter,
-                    pdf_url: pdf_url
-                  }
+                    if(data.length == 0){
+                        data = {
+                            listPrinter: listPrinter,
+                            pdf_url: pdf_url
+                        }
+                    }else{
+                        let printer_json = JSON.parse(data);
+                        defaultPrinter = printer_json.printer_name;
+                        data = {
+                            listPrinter: listPrinter,
+                            defaultPrinter: defaultPrinter,
+                            pdf_url: pdf_url
+                        }
+                    }
                   win.show();
                   let json_data =  JSON.stringify(data);
                   log.info("打印机列表数据【"+json_data+"】")