From 8866b7e8ce723cc61edcd1c70c053b2d9b96d46e Mon Sep 17 00:00:00 2001
From: ye huping <hupeng.net@hotmail.com>
Date: Thu, 27 Apr 2017 16:54:19 +0800
Subject: [PATCH] add once keyword, not generage observe attribute for tag

---
 src/server/generators/tagGenerator.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/server/generators/tagGenerator.js b/src/server/generators/tagGenerator.js
index 14f3bcd..3ce7697 100644
--- a/src/server/generators/tagGenerator.js
+++ b/src/server/generators/tagGenerator.js
@@ -19,6 +19,7 @@ export default function _tagGenerator (options = {}) {
               // these attributes are treated as children on the tag
               case 'innerHTML':
               case 'cssText':
+              case 'once':
                 return attrsStr
 
               // these form the attribute list for this tag
@@ -35,10 +36,15 @@ export default function _tagGenerator (options = {}) {
           // these tag types will have content inserted
           const closed = ['noscript', 'script', 'style'].indexOf(type) === -1
 
+          // generate tag exactly without any other redundance attribute
+          const observeTag = tag.once
+            ? ''
+            : `${attribute}="true" `
+
           // the final string for this specific tag
           return closed
-            ? `${tagsStr}<${type} ${attribute}="true" ${attrs}/>`
-            : `${tagsStr}<${type} ${attribute}="true" ${attrs}>${content}</${type}>`
+            ? `${tagsStr}<${type} ${observeTag}${attrs}/>`
+            : `${tagsStr}<${type} ${observeTag}${attrs}>${content}</${type}>`
         }, '')
       }
     }