function submitForm() {
    let isValid = true;
    clearErrors();

    if (!checkInfo.checkMobileNo()) {
        document.getElementById('mobileNoError').innerText = '手机号格式有误';
        isValid = false;
    }

    if (!checkInfo.checkPassword()) {
        document.getElementById('passwordError').innerText = '密码须为长度为6-20位字母、数字或符号';
        document.getElementById('confirmPasswordError').innerText = '两次输入的密码不一致';
        isValid = false;
    }

    if (isValid) {
        document.getElementById('encryptedPassword').value = md5(
            document.getElementById('password').value
        );
        document.getElementById('encryptedConfirmPassword').value = md5(
            document.getElementById('confirmPassword').value
        );
        return true;
    }
    return false;
}

function clearErrors() {
    document.getElementById('mobileNoError').innerText = '';
    document.getElementById('passwordError').innerText = '';
    document.getElementById('confirmPasswordError').innerText = '';
}