注釋: {# haha #}
對象引用 : {{data.name}} 或者 {{data['name]}}
控制語句放到{% %}中
{% if not has_in_gifts and not has_in_wishes %}
<div class="col-md-1">
<a class="btn btn-outline"
href="#modal">
贈送此書
</a>
</div>
{% elif has_in_wishes %}
<div class="col-md-3">
<span class="bg-info">已添加至心願清單</span>
</div>
{% else %}
<div class="col-md-3">
<span class="bg-info">已添加至贈送清單</span>
</div>
{% endif %}
{% for message in messages %}
{% if message %}
<div class="alert alert-warning" role="alert">{{ message }}</div>
{% endif %}
{% endfor %}
周遊的對象是一個字典
{% for key, error in form.errors.items() %}
<div class="alert alert-warning" role="alert">{{ error }}</div>
{% endfor %}
{% with messages = get_flashed_messages() %}
{% for message in messages %}
{% if message %}
<div class="alert alert-warning" role="alert">{{ message }}</div>
{% endif %}
{% endfor %}
{% endwith %}