From 9a42b264fd403df8b76427cc0e579961dbca2cc2 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Thu, 26 Sep 2019 22:11:16 +0900
Subject: [PATCH] web: Speed optimization

---
 internal/web/js.go | 32 ++++++++++++++++++++------------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/internal/web/js.go b/internal/web/js.go
index 1d8b490c0..dbd00592f 100644
--- a/internal/web/js.go
+++ b/internal/web/js.go
@@ -25,23 +25,31 @@ func IsBrowser() bool {
 	return true
 }
 
-var userAgent = js.Global().Get("navigator").Get("userAgent").String()
+var (
+	userAgent = js.Global().Get("navigator").Get("userAgent").String()
+
+	isIOSSafari     bool
+	isAndroidChrome bool
+)
+
+func init() {
+	isIOSSafari = strings.Contains(userAgent, "iPhone")
+
+	if !strings.Contains(userAgent, "Android") {
+		isAndroidChrome = false
+	}
+	if !strings.Contains(userAgent, "Chrome") {
+		isAndroidChrome = false
+	}
+	isAndroidChrome = true
+}
 
 func IsIOSSafari() bool {
-	if !strings.Contains(userAgent, "iPhone") {
-		return false
-	}
-	return true
+	return isIOSSafari
 }
 
 func IsAndroidChrome() bool {
-	if !strings.Contains(userAgent, "Android") {
-		return false
-	}
-	if !strings.Contains(userAgent, "Chrome") {
-		return false
-	}
-	return true
+	return isAndroidChrome
 }
 
 func IsMobileBrowser() bool {