修复重复打印

src/js/setting/print_monitor.js

@@ -78,7 +78,7 @@ let print_monitor={
 
   //开启打印监听
   openPrinting:function(win){
-    ipcMain.on('print', function (event, json_data) {
+    ipcMain.once('print', function (event, json_data) {
       let data = JSON.parse(json_data)
       log.info("打印开始，打印地址为:【"+json_data+"】")
       print_operation.printing(data.pdf_url, data.printer,win);
@@ -94,6 +94,9 @@ let print_monitor={
     win.on("close", (e) => {
       ipcMain.removeAllListeners('close_listPrinter');
     });
+    win.on("close",(e) => {
+      ipcMain.removeAllListeners('print');
+    });
 
   }
 }