完成商品缓存清理功能

@@ -36,7 +36,7 @@ class ProductCache extends Model{
     }
     async _batchPost(list, url) {
         let self = this;
-        let interval = 2;
+        let interval = 50;
         return new Promise(async (resolve, reject) => {
             let tick = parseInt(list.length / interval, 10) + (list.length % interval > 0 ? 1 : 0);
             let post = async (i, len) => {