JSON數組 - 使用Javascript提取數據

Question

我有一個非常簡單的Json數組，我需要回來

• 數組中的項目數。
• id的順序列表。

數組如下：

{"error":false,"error_msg":"","body":
{"records":[{"name":"Application","id":1},
            {"name":"Fees Paid","id":2},
            {"name":"Evidence Verification","id":3},
            {"name":"Details QA","id":4},
            {"name":"Grade Approval","id":5},
            {"name":"Welcome Pack","id":6}]
},
"validation_errors":[]}

Answer 1

假設您將JSON.parse d字符串轉換為名為jsonobj的變量，以下語句將獲取所需的數據：

var len = jsonobj.body.records.length;
jsonobj.body.records.sort(function(a,b) {return a.id-b.id;});
// now iterate through jsonobj.body.records and they will be in ascending ID order

Answer 2

假設您將對象保存在變量jObj ，克隆數組/對象以便保留原始數據，根據需要對其進行sort ，然后返回一個僅包含名稱屬性的數組 。

jObj['body']['records']
    .map(function (e) {return {'id': e['id'], 'name': e['name']};}) // clone
    .sort(function (a, b) {return +a['id'] - +b['id'];})            // sort asc
    .map(function (e) {return e['name'];});                         // get names
/* [
    "Application", "Fees Paid",      "Evidence Verification",
    "Details QA",  "Grade Approval", "Welcome Pack"
] */