如何遍歷json與數組並獲取所有值？

Question

我有一個看起來像這樣的JSON：

{
"success": false,
"error": {
    "username": [
        "The username has already been taken."
    ],
    "email_address": [
        "The email address has already been taken."
    ]
}
}

我想將所有消息存儲在一個數組中。 現在，我正在通過逐個檢查手動進行操作。 有沒有更好的辦法？

Answer 1

您可以使用Object.keys方法，該方法將返回帶有error鍵的數組。 然后，您可以使用任何Array方法（例如map ， forEach ， reduce對其進行迭代，以自行收集消息。

 const response = { "success": false, "error": { "username": [ "The username has already been taken.", "Another message" ], "email_address": [ "The email address has already been taken." ] } }; const result = Object.keys(response.error) .reduce((acc, key) => acc.concat(response.error[key]), []); console.log(result); 

Answer 2

這就是如何獲取數組中的所有消息

var a = {
"success": false,
"error": {
    "username": [
        "The username has already been taken."
    ],
    "email_address": [
        "The email address has already been taken."
    ]
}
}
var keys = Object.keys(a['error'])
var errors = a['error']

var c = [];
for(var i=0; i< keys.length; i++){
    c.push(a['error'][keys[i]][0])
}
console.log(c)