diff --git a/src/views/system/device/detail.vue b/src/views/system/device/detail.vue
index 7f4cf0a..7c59a1e 100644
--- a/src/views/system/device/detail.vue
+++ b/src/views/system/device/detail.vue
@@ -121,7 +121,7 @@ export default {
       if (expireTime < now) {
         return 0;
       }
-      return Math.floor((expireTime - now) / 60000);
+      return ((expireTime - now) / 60000).toFixed(2);
     },
     // 刷新设备信息
     refreshIot() {