添加仅保存最近latest.json选项

src/get_hotband.js

@@ -6,6 +6,9 @@ const path = require('path');
 
 const DATA_FOLDER = path.join(path.dirname(__dirname), process.env.DATA_FOLDER ?? 'data');
 console.log("DATA_FOLDER", DATA_FOLDER);
+createFolder(DATA_FOLDER); // 程序运行就保证 data 目录存在
+
+const LATEST_DATA_ONLY = process.env.LATEST_DATA_ONLY == true;
 
 // 请求微博热搜 APi 接口
 async function getApiResult(url) {
@@ -44,6 +47,7 @@ async function createFolder(folderToCreate) {
 
 // 保存 JSON
 function saveJSON({ now, fileNameSuffix, object, compress = true, uncompress = true }) {
+    if (LATEST_DATA_ONLY) return;
 
     let year = now.substring(0, 4);
     let month = now.substring(5, 7);