Javascript 遍历 JSON 文件

Question

{
  "comments": [
    {
      "created_utc": 1622513325,
      "text": "gdhg sgf sddsfsd fdsf"
    },
    {
      "created_utc": 1622513188,
      "text": "sfdg sgf fdgfdg"
    }
   ]
}

How would you iterate over each object to see the text?

Something like..?

  let data = fs.readFileSync(path.resolve(__dirname, 'comments.json'));
  let comments = JSON.parse(data);
  for(var i in comments){
    for(var j in i) {
      console.log("? " + j.text)
    }
  }

Answer 1

If you know the structure of your JSON will always be a comments object on the first level, containing a list of elements with created_utc and text , you can do as easy as the following code.

You don't need to nest the cycle as you only want to iterate over one list, then read the items and directly access to the text field of each item.

 var jsonString = `{ "comments": [ { "created_utc": 1622513325, "text": "gdhg sgf sddsfsd fdsf" }, { "created_utc": 1622513188, "text": "sfdg sgf fdgfdg" } ] }`; let comments = JSON.parse(jsonString).comments; comments.forEach(comment => { console.log(comment.text); });