控制流
控制流標(biāo)記（control flow tag）能夠根據(jù)編程邏輯改變 Liquid 輸出的信息。
if
只有當(dāng)某個(gè)條件為?true?時(shí)才執(zhí)行一段代碼。
輸入
{% if product.title == 'Awesome Shoes' %}
These shoes are awesome!
{% endif %}
輸出
These shoes are awesome!
unless
與?if?相對(duì) – 只有當(dāng)某個(gè)條件不成立時(shí)才執(zhí)行一段代碼。
輸入
{% unless product.title == 'Awesome Shoes' %}
These shoes are not awesome.
{% endunless %}
輸出
These shoes are not awesome.
和如下實(shí)例的執(zhí)行結(jié)果一致：
{% if product.title != 'Awesome Shoes' %}
These shoes are not awesome.
{% endif %}
elsif / else
為?if?或?unless?添加更多狀態(tài)判斷。
輸入
<!-- If customer.name = 'anonymous' -->
{% if customer.name == 'kevin' %}
Hey Kevin!
{% elsif customer.name == 'anonymous' %}
Hey Anonymous!
{% else %}
Hi Stranger!
{% endif %}
輸出
Hey Anonymous!
case/when
創(chuàng)建一個(gè)開(kāi)關(guān)表達(dá)式，用于將一個(gè)變量和多個(gè)不同值進(jìn)行比較。case?用于初始化一個(gè)開(kāi)關(guān)表達(dá)式，when?用于比較他們的值。
輸入
{% assign handle = 'cake' %}
{% case handle %}
{% when 'cake' %}
This is a cake
{% when 'cookie' %}
This is a cookie
{% else %}
This is not a cake nor a cookie
{% endcase %}
輸出
This is a cake