获取当前单据的字段值，如子表分隔展示公式

develop/@gms/gms-plugin-billexpand/src/formula/SubTableJointString.js

+// 子表中按照某个字符拼接
+export default {
+    execute: function () {
+        console.log("子表中按照某个字符拼接");
+        let field = arguments[0][0].FieldCode
+        let tableName = arguments[0][1].StaticValue
+        let value = arguments[0][2].StaticValue
+        let stringJoin = "";
+        if (arguments[1].getSubData(tableName)) {
+            let subTableValues = arguments[1].getSubData(tableName)
+            subTableValues.forEach((item, index) => {
+                if (item.getData()[field]) {
+                    if (item.getData()[field].value.length  != 0 ) {
+                        stringJoin = stringJoin + item.getData()[field].value + ","
+                    }
+                }
+            });
+        }
+        if(stringJoin.length > 0 ){
+            stringJoin = stringJoin.slice(0,stringJoin.length-1)
+            return stringJoin;
+        }else{
+            return null;
+        }
+    },
+    getResultType: function () {
+        return FMR.ConstDataTypes.General;
+    }
+}
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