golang的一个分页方法

//分页方法，根据传递过来的页数，每页数，总数，返回分页的内容 7个页数 前 1，2，3，4，5 后 的格式返回,小于5页返回具体页数
func Paginator(page, prepage int, nums int64) map[string]interface{} {

var firstpage int //前一页地址
var lastpage int  //后一页地址
//根据nums总数，和prepage每页数量 生成分页总数
totalpages := int(math.Ceil(float64(nums) / float64(prepage))) //page总数
if page > totalpages {
page = totalpages
}
if page <= 0 {
page = 1
}
var pages []int
switch {
case page >= totalpages-5 && totalpages > 5: //最后5页
start := totalpages - 5 + 1
firstpage = page - 1
lastpage = int(math.Min(float64(totalpages), float64(page+1)))
pages = make([]int, 5)
for i, _ := range pages {
pages[i] = start + i
}
case page >= 3 && totalpages > 5:
start := page - 3 + 1
pages = make([]int, 5)
firstpage = page - 3
for i, _ := range pages {
pages[i] = start + i
}
firstpage = page - 1
lastpage = page + 1
default:
pages = make([]int, int(math.Min(5, float64(totalpages))))
for i, _ := range pages {
pages[i] = i + 1
}
firstpage = int(math.Max(float64(1), float64(page-1)))
lastpage = page + 1
//fmt.Println(pages)
}
paginatorMap := make(map[string]interface{})
paginatorMap["pages"] = pages
paginatorMap["totalpages"] = totalpages
paginatorMap["firstpage"] = firstpage
paginatorMap["lastpage"] = lastpage
paginatorMap["currpage"] = page
return paginatorMap
}

<div class="am-cf">
共{{.totals}}条记录 共记{{.paginator.totalpages}} 页 当前页  {{.paginator.currpage}}
<div class="am-fr">
<ul class="am-pagination">
<li class=""><a href="/clubadmin/topics/{{.paginator.firstpage}}">«</a></li>
{{range $index,$page := .paginator.pages}}
<li  {{if eq $.paginator.currpage $page }}class="am-active"{{end}}><a href="/clubadmin/topics/{{$page}}">{{$page}}</a></li>
{{end}}
<li><a href="/clubadmin/topics/{{.paginator.lastpage}}">»</a></li>
</ul>
</div>
</div>

res := models.Paginator(pa, pre_page, totals)
this.Data["paginator"] = res