jsonpath的基本语法：
输出book[0]的author值
"$.store.book[0].author"
输出全部author的值
"$.store.book[*].author"
输出book[*]中category == 'reference’的book
"$.store.book[?(@.category == 'reference')]"
输出book[*]中price>10的book
"$.store.book[?(@.price>10)]"
输出book[*]中含有isbn元素的book
"$.store.book[?(@.isbn)]"
输出该json中所有price的值
"$..price"
输出该json中所有title的值
"$..title"
输出该json中book 0,1的值
"$..book[0,1]" #或者 "$..book[:2]"
