feat: 设置表格默认值为空，避免显示null和undefined

public/static/plugs/ulthon-admin/ulthon-admin.js

@@ -1118,9 +1118,11 @@
 
 
                         if (val.sort === undefined) {
-
                             cols[i][index]['sort'] = true;
                         }
+                        if (val.defaultValue === undefined) {
+                            cols[i][index]['defaultValue'] = '';
+                        }
 
                         // 判断是否包含初始化数据
                         if (val.init === undefined) {
@@ -1477,20 +1479,25 @@
                     return '';
                 }
                 var option = data.LAY_COL;
+  
                 field = field || option.field;
                 defaultValue = defaultValue || option.defaultValue;
+
                 var valueParser = option.valueParser;
-                var value = defaultValue;
+                var value = undefined;
                 try {
                     value = eval("data." + field);
                 } catch (e) {
-                    value = undefined;
-                }
 
+                }
                 if (typeof valueParser == 'function') {
                     value = valueParser(value, data);
                 }
 
+                if(value === null || value === undefined) {
+                    value = defaultValue
+                }
+
                 return value;
             },
             listenTableSearch: function (tableId) {