Merge branch 'fix/Enviroment.delete_data_execption' into 'wrdp'

Merge of fix/Enviroment.delete_data_execption 修复脚本上下文环境的data删除问题 to wrdp

See merge request o2oa/o2oa!2430

o2web/source/o2_core/o2/xScript/Environment.js

@@ -2056,8 +2056,10 @@ MWF.xScript.JSONData = function(data, callback, key, parent, _form){
             }},
             "del": {"value": function(delKey){
                 if (!this.hasOwnProperty(delKey)) return null;
-                delete data[delKey];
-                delete this[delKey];
+                // delete data[delKey];
+                // delete this[delKey];
+                    data[delKey] = "";
+                    this[delKey] = "";
                 return this;
             }}
         };