为什么来自from的数据不会保存在localStorage中？

Question

我有一个表单，用户必须填写所有字段。填写完所有字段并按下提交按钮后，我希望将数据存储在本地存储中，然后将用户重定向到另一个页面，但由于某种原因，此代码无法正常工作，任何线索为什么？

的 HTML5 的

<form id="TheForm" action="SlutSidan.html" method="post">
                <div id="Row">
                    <input type="text" id="Name" placeholder="*Förnamn" required >
                    <input type="text" id="Surname" placeholder="*Efternamn" required >
                </div>      
                <div id="Row">
                    <input type="email" id="FirstEmail" placeholder="*e-postadress" autocomplete="on" required >
                    <input type="email" id="SecondEmail" placeholder="*Verifiera e-postadress" autocomplete="off" required >
                </div>
                <div id="Row">
                    <input type="text" id="Town" placeholder="*Ort" required >
                </div>  
                <div id="Row"> 
                    <input type="text" id="Address" placeholder="*Adress" required >
                </div>
                <div id="Row">
                    <input type="text" id="PostCode" placeholder="*Postnummer" required >
                </div>
                <div id="Row">
                    <input type="text" id="MobileNumber"  placeholder="*Mobilnummer" required >
                    <input type="text" id="TelephoneNumber" placeholder="Telefonnummer" >
                </div>  
                <textarea id="Comment" placeholder="Förslag på hur vi skulle kunna förbättra oss!"></textarea>
                <input type="submit" id="Submit" value="Skicka">    
            </form>

的的Javascript 的

var submit = function () {
    var name = document.getElementById('Name').value;
    var surname = document.getElementById('Surname').value;
    var firstemail = document.getElementById('FirstEmail').value;
    var getOrderNumber = localStorage.getItem('OrderNumberTemp');

    localStorage.setItem(getOrderNumber + ' Namn', name);
    localStorage.setItem(getOrderNumber + ' Efternamn', surname);
    localStorage.setItem(getOrderNumber + ' Email', firstemail);

    // Save all the other fields
};

window.onload = function () {
    var form = document.getElementById('TheForm');

    if (form.attachEvent) {
        form.attachEvent('Submit', submit);
    } else {
        form.addEventListener('Submit', submit);
    }
}

PS。用户确实被重定向但没有保存