collections.Delimit
用指定的分隔符连接给定切片或映射中的值，返回一个字符串。
连接切片：
{{ $s := slice "b" "a" "c" }}
{{ delimit $s ", " }} → b, a, c
{{ delimit $s ", " " and "}} → b, a and c连接映射：
{{ $m := dict "b" 2 "a" 1 "c" 3 }}
{{ delimit $m ", " }} → 1, 2, 3
{{ delimit $m ", " " and "}} → 1, 2 and 3