关闭页面时beforeunload执行两次的问题

o2web/source/x_component_process_Xform/Form.js

@@ -1332,8 +1332,8 @@ MWF.xApplication.process.Xform.Form = MWF.APPForm = new Class({
         }
         if (!this.options.readonly) {
             if (this.businessData.work && this.businessData.work.id) {
+                if (!this.isSendBeacon) {
                     if (this.app.inBrowser && navigator.sendBeacon) {
-
                         var obj = this.workAction.action.actions["checkDraft"];
                         var url = this.workAction.action.address + obj.uri;
                         url = url.replace("{id}", this.businessData.work.id);
@@ -1348,6 +1348,8 @@ MWF.xApplication.process.Xform.Form = MWF.APPForm = new Class({
                             }
                         }.bind(this), null, false);
                     }
+                    this.isSendBeacon = true;
+                }
             }
         } else {
             this.app.refreshTaskCenter();