请问这个字符串如何转数组？'["1","2","3"]'

> a = '["1","2","3"]'
'["1","2","3"]'
> a.split()
[ '["1","2","3"]' ]
> a.split(",")
[ '["1"', '"2"', '"3"]' ]
> a.split(",")
[ '["1"', '"2"', '"3"]' ]

想把它转换为["1", "2", "3"], 是先要去掉字符串的'[ 吗？谢谢！