我希望能够使用JS作为前端来检测移动设备，并且更好地采用这种方式，但是需要分配给smarty assign标签吗？
我需要能够定义移动设备或桌面设备是否加载了email.tpl，因为无法将窗体加载两次，因此需要在页面上独立，否则会隐藏，无需复制JS。如果不可能，则必须为表单分配单独的类和ID，但希望尽可能干净，并且也可以方便地使用smarty进行检测。
以下是当前代码：
<script type="text/javascript">
/**
* jQuery.browser.mobile (http://detectmobilebrowser.com/)
* jQuery.browser.mobile will be true if the browser is a mobile device
**/
(function(a) {
(jQuery.browser = jQuery.browser || {}).mobile = /(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i.test(a) || /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0, 4))
})(navigator.userAgent || navigator.vendor || window.opera);
alert("device detection:" + jQuery.browser.mobile);
if(jQuery.browser.mobile == true){
// set mobile status js / smarty vars
{assign var="is_mobile" value="true"}
var is_mobile = "true";
} else if(jQuery.browser.mobile == false) {
// set mobile status js / smarty vars
{assign var="is_mobile" value="false"}
var is_mobile = "false";
}
alert("is mobile (js):" + is_mobile);
</script>
{assign var="ajax_form" value="cm-ajax"}
{include file="views/profiles/components/profiles_scripts.tpl"}
<div style="margin-top: 100px;">is mobile: {$is_mobile}</div>
<div class="checkout-progress mobile-only">
<ul class="row collapse">
<li class="span4 status-bag active">
<span class="ty-step__container-active">
<h3 class="ty-step__title-active clearfix">
<span class="ty-step__title-left"><i class="am-icon-shopping-basket"></i></span>
<span class="ty-step__title-txt">{__("express_checkout")}</span>
</h3>
</span>
</li>
<li class="span4 status-delivery disabled">
<span class="ty-step__container-active">
<h3 class="ty-step__title-active clearfix">
<span class="ty-step__title-left"><i class="fa fa-truck"></i></span>
<span class="ty-step__title-txt">Delivery</span>
</h3>
</span>
</li>
<li class="span4 status-payment disabled">
<span class="ty-step__container-active">
<h3 class="ty-step__title-active clearfix">
<span class="ty-step__title-left"><i class="fa fa-credit-card"></i></span>
<span class="ty-step__title-txt">{__("billing_options")}</span>
</h3>
</span>
</li>
</ul>
</div>
<div class="cm-save-fields clearfix" id="onestepcheckout">
<!-- MOBILE ONLY - SHOW THE EMAIL SECTION (PRE CHECKOUT) -->
{if $is_mobile == "true"}
{include file="addons/onestepcheckout/views/onestepcheckout/sections/email.tpl" device="mobile"}
{/if}
<div class="{if $addons.onestepcheckout.layout_columns == 3}span4 column-bag{else}col1{/if}">
{include file="addons/onestepcheckout/views/onestepcheckout/sections/cart.tpl"}
<div class="pre-checkout-summary">
{include file="addons/onestepcheckout/views/onestepcheckout/sections/pre_summary.tpl"}
</div>
</div>
<!-- DESKTOP ONLY - SHOW THE EMAIL SECTION (PRE CHECKOUT) -->
{if $is_mobile == "false"}
{include file="addons/onestepcheckout/views/onestepcheckout/sections/email.tpl" device="desktop"}
{/if}
<div class="checkout-email-active span8">
<form name="onestepcheckout_form" action="{""|fn_url}" method="post">
<div class="{if $addons.onestepcheckout.layout_columns == 3}span6{else}col1{/if}">
{include file="addons/onestepcheckout/views/onestepcheckout/sections/customer.tpl"}
</div>
<div class="{if $addons.onestepcheckout.layout_columns == 3}span6{else}col2{/if}">
{include file="addons/onestepcheckout/views/onestepcheckout/sections/shipping.tpl"}
{include file="addons/onestepcheckout/views/onestepcheckout/sections/payment.tpl"}
{include file="addons/onestepcheckout/views/onestepcheckout/sections/summary.tpl"}
</div>
</form>
</div>
<!--onestepcheckout--></div>
{if !$auth.user_id}
<div id="checkout_login_block" class="hidden" title="{__("sign_in")}">
<div class="login-popup">
{include file="views/auth/login_form.tpl" style="popup" id="popup_checkout_login_block"}
</div>
</div>
{/if}
{capture name="mainbox_title"}<span class="ty-checkout__title">{__("secure_checkout")}<i class="ty-checkout__title-icon ty-icon-lock"></i></span>{/capture}