fea: 添加地图管理

js/save.js

@@ -42,6 +42,15 @@ export const Save = {
     this.flush();
     return lv;
   },
+  /** 更新已保存的自制关卡（按 id 就地替换，不新增）；id 不存在则追加 */
+  updateCustom(lv) {
+    this.data.customs = this.data.customs || [];
+    const i = this.data.customs.findIndex(l => l.id === lv.id);
+    if (i >= 0) this.data.customs[i] = lv;
+    else this.data.customs.push(lv);
+    this.flush();
+    return lv;
+  },
   removeCustom(id) {
     this.data.customs = (this.data.customs || []).filter(l => l.id !== id);
     this.flush();