我的表單正在調用以下函數。它在桌面上運行，用戶被定向到下載確認/失敗頁面。但是，在移動設備上（在 iOS 和 iPad 上測試過），用戶不會被重定向。任何人都可以闡明一下嗎？功能function submit_form(){    var email = document.getElementById("main-email-field").value    // todo email validation    if (email.length > 7)    {        window.location = '/download-confirmation'    }    else    {        window.location = '/download-failed'    }    return false;}形式<form id="main-email-form" class="email-form" method="POST" onsubmit="submit_form()" action="https://europe-west1-hoddle-website.cloudfunctions.net/registerUser" target="hiddenFrame">    <input id="main-email-field" class="main-email-field" type="email" name="email" placeholder="Email address">    <button id="main-email-button" class="main-email-button">Download</button>    <input type="hidden" id="main-referralID-field" name="referralID" value="">    <input type="hidden" id="main-referralType-field" name="referralType" value="">    <input type="hidden" id="main-referralUserID-field" name="referralUserID" value="">    </form>        <iframe id="hiddenFrame" class="hiddenFrame" name="hiddenFrame" width="0" height="0" border="0" style="display: none;"></iframe>