Question

我有一个HTML注册表单，该表单接受输入并存储在JavaScript数组中，然后使用JSON.stringify并将其最终存储在本地存储中。问题在于密钥是undefined（电子邮件是我的密钥），值是[object Object]。有人可以帮我解决这个问题吗？谢谢？

<!DOCTYPE html>
<html>
<head>
    <title>Learning</title>
</head>
<body>
    <form id="usrDetails" onclick="return false">
        <h1>sign up</h1>
        <input type="text" name="username" placeholder="Username"/><!--the name attribute describes input name and is used as reference.-->
        <input type="text" name="email" placeholder="Email"/><!--placeholder defines the text to appear in the blank box-->
        <input type="password" name="password" placeholder="Password"/>
        <input type="password" name="password2" placeholder="Retype Password"/>
        <input type="submit" onclick="storeUser();"/> <!--value defines the text to appear on the button-->
    </form>

    <p id="result"></p>

    <script>
        function storeUser() {
            var usrObject={};
            if (document.getElementById("username") !== null) {
                usrObject.username = document.getElementById("Username").value;
            }
            if (document.getElementById("email") !== null) {
                usrObject.email = document.getElementById("email").value;
            }
            if (document.getElementById('password') !== null) {
               usrObject.password = document.getElementById("password").value;
            }
            if (document.getElementById('password2') !== null) {
                usrObject.password2 = document.getElementById("password2").value;
            }
            localStorage.setItem(usrObject.email, usrObject) 
            JSON.stringify(usrObject);
            //localStorage[usrObject.email] = JSON.stringify(usrObject);
            document.getElementById("result").innerHTML = "<b>Registration successful</b>"
        }

    </script>
</body>

Answer 1

您使用的是document.getElementById()，但是输入中没有ID。您的表格应为：

<form id="usrDetails" onclick="return false">
    <h1>sign up</h1>
    <input type="text" id="Username" name="username" placeholder="Username"/><!--the name attribute describes input name and is used as reference.-->
    <input type="text" id="email" name="email" placeholder="Email"/><!--placeholder defines the text to appear in the blank box-->
    <input type="password" id="password" name="password" placeholder="Password"/>
    <input type="password" id="password2" name="password2" placeholder="Retype Password"/>
    <input type="submit" onclick="storeUser();"/> 
</form>

还行：

localStorage[usrObject.email] = JSON.stringify(usrObject);

应该是：

localStorage.setItem(usrObject.email, JSON.stringify(usrObject));

...假设您希望电子邮件地址成为存储的用户对象的键。

本地存储中的未定义键和空值

1 个答案: