join ----将列表元素连接起来
语法:
join list ?joinString?
该命令中list必须为一个有效的列表。该命令使得在list中的元素以joinString进行拼接，默认按空格拼接
Making a comma-separated list:
set data {1 2 3 4 5}
join $data ", "
=> 1, 2, 3, 4, 5
Using join to flatten a list by a single level:
set data {1 {2 3} 4 {5 {6 7} 8}}
join $data
=> 1 2 3 4 5 {6 7} 8
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