fix: 2

src/sdk/cover/index.js

@@ -91,7 +91,7 @@ let addPath = ()=>{//加个他们拍的路径
     
     let btnCreated
     let createBtn = ()=>{
-        if(btnCreated)return
+        if(btnCreated || !Potree.browser.urlHasValue('exportPath') )return
         let btn = document.createElement('button')
         btn.innerHTML = '导出',btn.id = 'exportPath'
         $(btn).css({