Cannot read property 'setAttribute' of null - 专家坐堂 - Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

下面这段代码报错：Cannot read property 'setAttribute' of null

With wb.AddTabBar("page1", "tb1", 1)

.AddPage("mainage1","单据报表")

.AddPage("mainage2","明细报表")

.AddPage("mainage3","跟踪报表")

End With

wb.InsertHTML(<script>document.getElementById('mainage1').style.display='none';document.getElementById('mainage2').style.display='block';document.getElementById('mainage3').style.display='none';document.getElementById('mainage1_btn name=').setAttribute('class','weui_tabbar_item');document.getElementById('mainage2_btn name=').setAttribute('class','weui_tabbar_item weui_bar_item_on');document.getElementById('mainage3_btn name=').setAttribute('class','weui_tabbar_item');</script>")

主题：Cannot read property 'setAttribute' of null