From d27c6e48aa3cecd618e4a5756826984918b5b261 Mon Sep 17 00:00:00 2001
From: wangyaqi <wangyaqi988@163.com>
Date: Thu, 25 Jan 2024 12:02:18 +0800
Subject: [PATCH] =?UTF-8?q?docs:=20=E6=9B=B4=E6=96=B0uni-app-x=20position?=
 =?UTF-8?q?=E6=96=87=E6=A1=A3?=
MIME-Version: 1.0
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---
 docs/css/position.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/docs/css/position.md b/docs/css/position.md
index 8b6ad1fc..c132cbe5 100644
--- a/docs/css/position.md
+++ b/docs/css/position.md
@@ -15,6 +15,27 @@
 
 
 #### App平台差异  
+
 absolute元素相对父组件确定位置，fixed元素位于页面顶层。
 
+#### fixed定位@fixed
+
+position: fixed定位时，web端为相对于整个浏览器页面进行定位，app端为相对于页面（除导航栏、tabbar）定位。可以使用css变量使两端表现一致
+
+```css
+.fixed {
+  position: fixed;
+  width: 100px;
+  height: 100px;
+  background-color: #FF0000;
+  left: 10px;
+  /* #ifdef WEB */
+  top: calc(--window-top + 10px);
+  /* #endif */
+  /* #ifdef APP */
+  top: 10px;  /* App端暂不支持calc */
+  /* #endif */
+}
+```
+
 <!-- CSSJSON.position.reference -->
\ No newline at end of file
-- 
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