如何转换VBS On error resume旁边的javascript

Question

On Error Resume Next
    frmDetail.Description<%=nLineCount%>.readonly = False
    frmDetail.DetailedDescription<%=nLineCount%>.readonly = False
On Error GoTo 0

我有上面的vb脚本代码段。我需要将其转换为java脚本。我该怎么办？