在golang HTML模板中切换或if/elseif/else

isAttachmentType{if}

{{range .Paragraphs}}
    {{if .IsAttachment}}
        -- attachement presentation code  --
    {{else}}{{if .IsMenu}}
        -- menu --
    {{else}}
        -- default code --
    {{end}}{{end}}
{{end}}

IsSomething{end}}

开关if/elseif/else