递归层级菜单

总是遇到这种菜单，故记录，方便复用

    <script type="x-tmpl-mustache" id="app-menu-tpl">
        <ul class="app-menu-children {{level}}">
            {{#items}}
            <li>
                <div style="padding-left: {{distance}}px" data-name="{{name data-code="{{code}}" data-open-type="{{openType}}" data-url="{{url}}" class="app-menu-name app-code-{{code}} {{#hasSub}}app-menu-parent{{/hasSub}}" title="{{name}}">
                    <span class="app-menu-txt text-ellipsis">{{name}}</span>
                    <i class="app-menu-icon action-icon icon-down"></i>
                </div>
                {{{children}}}
            </li>
            {{/items}}
        </ul>
    </script>

    var APP_MENU_TPL = $.trim($('#app-menu-tpl').html());

    function renderAppMenu(data, dep) {
        if(!dep) {
            dep = 1;
        } else {
            dep = dep + 1;
        }
        $(data).each(function(index,item) {
           
            item['distance'] = 28 + (dep-1) * 17;
            item['hasSub'] = item.items && item.items.length ? true : false;

            if(item.items && item.items.length) {
                item.children = renderAppMenu(item.items, dep);
            }
        })
        return Mustache.render(APP_MENU_TPL, {
                items: data,
                level: 'level-' + dep
            });
    }