使用 JSONPath 表达式从 JSON 中提取节点，支持过滤与切片
$
$.store.book
$.store.book[*].author
$..author
$.store.book[?(@.price < 10)]
$.store.book[-1:]
$.store.book[0,1]
$.store.*
$..*
[ "Nigel Rees", "Evelyn Waugh", "Herman Melville", "J. R. R. Tolkien" ]
.
[..]
*
..
?()
[start:end]
[n,m]