From ead1ca5ce22319af76b668b88a9247829dc69c71 Mon Sep 17 00:00:00 2001
From: yoyo837 <yoyo837@hotmail.com>
Date: Sun, 9 Feb 2020 19:14:34 +0800
Subject: [PATCH] explainAndExtraDistance

---
 components/form/style/index.less | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/components/form/style/index.less b/components/form/style/index.less
index b8f0279e10..5a7981c978 100644
--- a/components/form/style/index.less
+++ b/components/form/style/index.less
@@ -27,6 +27,13 @@
   }
 }
 
+.explainAndExtraDistance(@num) when (@a>=0) {
+  padding-top: floor(@num);
+}
+.explainAndExtraDistance(@num) when (@a<0) {
+  margin-top: floor(@num);
+}
+
 // ================================================================
 // =                             Item                             =
 // ================================================================
@@ -123,7 +130,7 @@
   &-extra {
     clear: both;
     min-height: @form-item-margin-bottom;
-    padding-top: floor((@form-item-margin-bottom - @form-font-height) / 2);
+    .explainAndExtraDistance((@form-item-margin-bottom - @form-font-height) / 2);
     color: @text-color-secondary;
     font-size: @font-size-base;
     line-height: @line-height-base;