Jekyll Liquid Filters
Standard Liquid Filters
default
Allows you to specify a fallback in case a value doesn’t exist. default will show its value if the left side is nil, false, or empty.
In this example, product_price is not defined, so the default value is used.
Input:（第一种情况，没定义的情况）
{{ product_price | default: 2.99 }}Output:
2.99In this example, product_price is defined, so the default value is not used.
Input:（第二种情况，已经定义的情况）
{% assign product_price = 4.99 %}
{{ product_price | default: 2.99 }}Output:
4.99In this example, product_price is empty, so the default value is used.
Input:（第三种情况，已经定义，但内容为空）
{% assign product_price = "" %}
{{ product_price | default: 2.99 }}Output:
2.99escape
Escapes a string by replacing characters with escape sequences (so that the string can be used in a URL, for example). It doesn’t change strings that don’t have anything to escape.
{{ "Have you read 'James & the Giant Peach'?" | escape }}Output:
Have you read 'James & the Giant Peach'?