移動端表單驗證用戶名與手機號

<form  class="form" target="ifrm" name="contactForm" method="post" action="mail.php" id="form1">
<div class="mt20">
<label for="name" class="namelabel">您的姓名：</label><br>
<input type="text" placeholder="請輸入您的姓名..." class="write write1" id="username" />
</div>
<div class="mt20">
<label for="name" class="namelabel">聯系電話：</label><br>
<input type="tel" placeholder="請輸入您的手機號碼..." class="write write2" id="tel" maxlength="11" />
</div>
<center>
<input type="button" id="hf1 class="submite" value="點擊提交獲取學歷方案" onclick="sb();"/>
</center>

</form>

 

<script type="text/javascript">

function sb(){

var username = document.getElementById("username");
var tel = document.getElementById("tel");
var rules = /^1[3,5]\d{9}$/;
var hf1 = document.getElementById("hf1");
if(username.value==null || username.value==""){
alert("請輸入姓名");
username.focus();
return;
}
if(tel.value==null || tel.value==""){
alert("請輸入手機號");
tel.focus();
return;
}else if(rules.test(tel.value)){
//alert('是手機號碼');
hf1.type = 'submit';
}else {
alert('不是手機號碼');

}

}

</script>