Question

我有一个看起来像这样的对象：

let data = {
 color: "green",
 color1: "red",
 color2: null,
 color3: 34,
 color4: null,
 color5: true,
 color6: [],
}

我想只提取具有值的属性并创建一个新对象。所以这个新对象看起来像这样：

   let data = {
     color: "green",
     color1: "red",
     color3: 34,
     color5: true,
    }

这将是动态的，属性和值可以改变，但最后我总是想做一个只有值的对象。有什么实际可行的方法呢？

Answer 1

您可以按照以下步骤创建Object.keys：

您可以使用Array.reduce
然后，您可以使用acc将键数组转换为转换后的对象。
在curr中，您将获得累积的对象。
在isEmptyObject中，您将收到当前密钥
创建一个函数null，您可以在其中定义规则以检查是否存在。根据您的示例，我检查了Array length和let data = { color: "green", color1: "red", color2: null, color3: 34, color4: null, color5: true, color6: [], } var newObj = Object.keys(data).reduce((acc, curr) => { if (isEmptyObject(data, curr)) return acc; acc[curr] = data[curr]; return acc; }, {}); function isEmptyObject(obj, key) { return obj[key] === null || Array.isArray(obj[key]) && obj[key].length === 0; } console.log(newObj);。您可以修改此功能。

＆＃13;

<?php

include ("dbConnect.php");
require 'libPassword.php';

function filter_email_header($email){
  return preg_replace('/[\0\n\r\|\!\/\<\>\^\$\%\*\&]+/','',$email);
}

if(isset($_POST['submit'])){
    $forename = $_POST['forename'];
    $surname = $_POST['surname'];
    $telephone = $_POST['telephone'];
    $address = $_POST['address'];
    $medical_conditions = $_POST['medical_conditions'];
    $dob = $_POST['dob'];
    $email = $_POST['email'];
    $password = $_POST['password'];
    $last_login = date("Y-n-d");




    $dbQuery=$db->prepare("SELECT email FROM customer where email > 0");
            $dbParams = array('email'=>$email);
            $dbQuery->execute($dbParams);
            if ($dbQuery) {
                $message = "username already exists";
                echo "<script type='text/javascript'>alert('$message');</script>";
            }//if
            else{

    $hashPassword = password_hash($pass, PASSWORD_BCRYPT, array("cost" => 12));

      if($dbQuery->rowCount()==0){
          $dbQuery=$db->prepare("INSERT INTO customer (forename, surname, telephone, address, medical_conditions, dob, email, password) VALUES (:forename, :surname, :telephone, :address, :medical_conditions, :dob, :email, :hashPassword)");
            $dbParams = array('forename'=>$forename,'surname'=>$surname, 'telephone'=>$telephone, 'address'=>$address,'medical_conditions'=>$medical_conditions, 'dob'=>$dob, 'email'=>$email, 'hashPassword'=>$hashPassword);
            $dbQuery->execute($dbParams);
            if($dbQuery) {


                header("Location: myProfile.php");
            }//if

        }//if
        else{
                echo('Please fill out all fields marked with *');
            }//else2
            }//else1

if(isset($email)){
  $sender='jess@gymmembership.com';
  $email = filter_email_header($email);
  $headers = "From:". $sender;
  $to      = $email; // Send email to our user
  $subject = 'Signup | Verification'; // Give the email a subject 
  $message = '

Thanks for signing up!
Here is your login details:

------------------------
Your email: '.$email.'
Password: '.$password.'
------------------------

You can now login to your account:


'; // Our message above including the link

$headers = 'From:gymmanagementsystem' . "\r\n"; // Set from headers
//mail($to, $subject, $message, $headers); // Send our email
$sent=mail($to, $subject, $message, $email);
    }}
?>

＆＃13;

仅提取在object中具有值的属性

1 个答案: