从JSON字符串元素中提取JSON表

Question

I get this JSON in response from server:

{
   "tab":[
      "[[\"2018\",11,\"19\",\"16\",\"13\"],null,null,null,null,null,\"40\"]",
      "[[\"2018\",11,\"19\",\"16\",\"19\"],null,null,null,null,null,\"56\"]",
      "[[\"2018\",11,\"19\",\"16\",\"21\"],null,null,null,null,\"57\",null]"
   ]
}

I know, that I can get first element of tab table returned using $.tab[1] . The returned element is a string that holds a table - first element of this table is another table holding a date. The question is what JSON Path expression should I use in order to extract year value from the inner table or one of those numbers at the end (40, 56, 57)?

Answer 1

I'm not sure what you mean when you say you can get the first element with $.tab[1] . Are you using jQuery? Even so, that doesn't seem to make any sense. Regardless, you can parse those inner tables and access them normally as arrays:

 var results = { "tab":[ "[[\\"2018\\",11,\\"19\\",\\"16\\",\\"13\\"],null,null,null,null,null,\\"40\\"]", "[[\\"2018\\",11,\\"19\\",\\"16\\",\\"19\\"],null,null,null,null,null,\\"56\\"]", "[[\\"2018\\",11,\\"19\\",\\"16\\",\\"21\\"],null,null,null,null,\\"57\\",null]" ] }; // you can refactor this as a method for more convenient usage, this is just a demo var row = JSON.parse(results.tab[0]); // now you just have a multi-dimensional array, use it as normal console.log(row[0][0]); //year console.log(row[6]); //number