js模板引擎里面的for循环条件里面的o是什么

<script id="template-upload" type="text/x-tmpl">
{% for (var i=0, file; file=o.files[i]; i++) { %}
    <tr class="template-upload fade">
        {% if (file.error) { %}
            <td class="name">{%=file.name%}</td>
            <td class="size">{%=o.formatFileSize(file.size)%}</td>
            <td class="error"><span class="label label-important">{%=locale.fileupload.error%}</span> {%=locale.fileupload.errors[file.error] || file.error%}</td>
        {% } else if (o.files.valid && !i) { %}
            <td class="name">
                {%=file.name%}
                <div class="progress progress-success progress-striped active"><div class="bar" style="width:0%;"></div></div>
            </td>
            <td class="size">{%=o.formatFileSize(file.size)%}</td>
            <td class="start">{% if (!o.options.autoUpload) { %}
                <button class="btn btn-success">
                    <span class="icon-upload"></span>
                    <span>{%=locale.fileupload.start%}</span>
                </button>
            {% } %}</td>
        {% } else { %}
            <td class="name">{%=file.name%}</td>
            <td class="size">{%=o.formatFileSize(file.size)%}</td>
            <td></td>
        {% } %}
        <td class="cancel">{% if (!i) { %}
            <button class="btn btn-warning">
                <span class="icon-ban-circle"></span>
                <span>{%=locale.fileupload.cancel%}</span>
            </button>
        {% } %}</td>
    </tr>
{% } %}
</script>



<!-- The template to display files after upload -->
<script id="template-download" type="text/x-tmpl">
{% for (var i=0, file; file=o.files[i]; i++) { %}
    <tr class="template-download fade">
        {% if (file.error) { %}
            <td class="name">{%=file.name%}</td>
            <td class="size">{%=o.formatFileSize(file.size)%}</td>
            <td class="error" colspan="2"><span class="label label-important">{%=locale.fileupload.error%}:</span> {%=locale.fileupload.errors[file.error] || file.error%}</td>
        {% } else { %}
            <td class="name">{%=file.name%}</td>
            <td class="size">{%=o.formatFileSize(file.size)%}</td>
            <td colspan="2"></td>
        {% } %}
    </tr>
{% } %}
</script>

这段代码里面的o是什么，for循环 条件里面o
文件上下文中没有这个o

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传给模板的自定义变量呗

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https://github.com/blueimp/JavaScript-Templates/blob/master/README.md

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渲染模板的时候会用到数据对象，o就是这个对象里的