我有一个看起来像这样的字符串
[
{"last_name":"Aiken","first_name":"George","state":"VT","party":"R"},
{"last_name":"Allott","first_name":"Gordon","state":"CO","party":"R"},
{"last_name":"Anderson","first_name":"Clinton","state":"NM","party":"L"},
{"last_name":"Bartlett","first_name":"Edward","state":"AK","party":"D"}
]
那存储在一个变量中。我如何将此字符串添加到数组中,以便我可以访问需要的数据(无需标点符号)。