{% macro input() %}
<input type="text" name='username' value=''>
{% endmacro %}

{{ input() }}

{% macro input2(name, type='text', value='',placeholder='') %}
    <input type="{{ type }}" name="{{ name }}" value="{{ value|e }}" placeholder="{{ placeholder }}">
{%- endmacro %}

{{ input2('username',placeholder="占位符") }}