将输出行项目存储为json值

Question

我正在尝试修改Shopify的跟踪代码以输出订单中的项目，但它给我的问题是不返回我想要的内容。请任何想法。这是var pr =不起作用的值。其余的很好，并输出我们需要的东西：

<!-- Onefeed Tracking -->

<script type="text/javascript" language="javascript">
     var of_ssid = 'xxxx';
     var cs = '{{ total_price | money_without_currency }}';
     var oi = '{{ order_number }}';
     var it = '{{ line_item.quantity }}';
     var pr = '{% assign items = line_item.product_id | split: "," | parse_json %}
{{ items[forloop.index] }}';
     var nc = '';
</script>

<script type="text/javascript" language="javascript" src="https://tracking.onefeed.co.uk/t.js"></script>
<noscript>
    <img border="0" src="https://tracking.onefeed.co.uk/ProcessProductCheckout.ashx?of_ssid=xxxx&cs={{ total_price | money_without_currency }}&it={{ line_item.quantity }}&oi={{ order_number }}&nc=&pr={% assign items = line_item.product_id | split: "," | parse_json %}
{{ items[forloop.index] }}" />
</noscript>

<!-- /Onefeed Tracking -->