diff --git a/packages/taro-cli/templates/default/src/index.html b/packages/taro-cli/templates/default/src/index.html
index 826f423513e9..f72013ec16cb 100644
--- a/packages/taro-cli/templates/default/src/index.html
+++ b/packages/taro-cli/templates/default/src/index.html
@@ -10,7 +10,7 @@
   <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" >
   <title></title>
   <script>
-    !function(x){function w(){var v,u,t,tes,s=x.document,r=s.documentElement,a=r.getBoundingClientRect().width;if(!v&&!u){var n=!!x.navigator.appVersion.match(/AppleWebKit.*Mobile.*/);v=x.devicePixelRatio;tes=x.devicePixelRatio;v=n?v:1,u=1/v}if(a>=640){r.style.fontSize="40px"}else{if(a<=320){r.style.fontSize="20px"}else{r.style.fontSize=a/320*20+"px"}}}x.addEventListener("resize",function(){w()});w()}(window);
+    !function(x){function w(){var v,u,t,s=x.document,r=s.documentElement,a=r.clientWidth;if(!v&&!u){var n=!!x.navigator.appVersion.match(/AppleWebKit.*Mobile.*/);v=x.devicePixelRatio;v=n?v:1,u=1/v}if(a>=640){r.style.fontSize="40px"}else{if(a<=320){r.style.fontSize="20px"}else{r.style.fontSize=a/320*20+"px"}}}x.addEventListener("resize",function(){w()});w()}(window);
   </script>
 </head>
 <body>
diff --git a/packages/taro/src/env.js b/packages/taro/src/env.js
index a8dc4ae79e40..84f9ce68c63b 100644
--- a/packages/taro/src/env.js
+++ b/packages/taro/src/env.js
@@ -9,29 +9,41 @@ export const ENV_TYPE = {
   JD: 'JD'
 }
 
+let _env = null
+
+// 一个taro项目肯定运行同样的环境
 export function getEnv () {
+  if (_env) return _env
   if (typeof jd !== 'undefined' && jd.getSystemInfo) {
+    _env = ENV_TYPE.JD
     return ENV_TYPE.JD
   }
   if (typeof qq !== 'undefined' && qq.getSystemInfo) {
+    _env = ENV_TYPE.QQ
     return ENV_TYPE.QQ
   }
   if (typeof tt !== 'undefined' && tt.getSystemInfo) {
+    _env = ENV_TYPE.TT
     return ENV_TYPE.TT
   }
   if (typeof wx !== 'undefined' && wx.getSystemInfo) {
+    _env = ENV_TYPE.WEAPP
     return ENV_TYPE.WEAPP
   }
   if (typeof swan !== 'undefined' && swan.getSystemInfo) {
+    _env = ENV_TYPE.SWAN
     return ENV_TYPE.SWAN
   }
   if (typeof my !== 'undefined' && my.getSystemInfo) {
+    _env = ENV_TYPE.ALIPAY
     return ENV_TYPE.ALIPAY
   }
   if (typeof global !== 'undefined' && global.__fbGenNativeModule) {
+    _env = ENV_TYPE.RN
     return ENV_TYPE.RN
   }
   if (typeof window !== 'undefined') {
+    _env = ENV_TYPE.WEB
     return ENV_TYPE.WEB
   }
   return 'Unknown environment'
