默认筛选条件
系统默认包含针对是否有货、主要价格、厂商和产品类型的筛选条件。自定义筛选条件使用产品多属性和元字段来确定其他可用筛选选项。例如，如果您销售包含不同尺寸多属性的服装，则可以启用针对尺寸的筛选条件。
搜索筛选器
默认情况下会包含产品的搜索筛选。客户可以通过应用筛选器来筛选搜索结果以缩小搜索范围。客户还可以按相关性和价格对搜索结果进行排序。
自定义筛选条件
除了 4 个默认筛选条件外，您最多还可以设置 20 个自定义筛选条件。可以使用您的产品多属性选项或元字段来创建自定义筛选条件。通过使用元字段，您可以创建针对以下项的筛选条件：
single_line_text_field
number_integer
number_decimal
若要对自定义筛选条件使用元字段，首先需要创建元字段。详细了解元字段以设置您的自定义筛选选项。
设置 single_line_text_field、number_integer 或 number_decimal 元字段后，它们将显示在添加筛选条件屏幕中的可选选项列表中。除了 4 个默认筛选选项外，您最多可以选择 20 个自定义筛选条件。
Shopify商户官网原文详情：
Default filters
Filters for availability, primary price, vendor, and product type are included by default. Custom filters use your product variants and metafields to determine which additional filter options are available. For example, if you sell clothing with different variants for size, then you can enable a filter for size.
Search filters
Search filtering for products is included by default. Customers can filter search results to narrow the search by applying filters. Customers can also sort search results by relevance and price.
Custom filters
In addition to the 4 default filters, you can have up to 20 custom filters. Custom filters can be created using your product variant options, or with metafields. Using metafields, you can create filters for:
single_line_text_field
number_integer
number_decimal
In order to use metafields for custom filters, the metafield needs to first be created. Learn more about Metafields to set up your custom filter options.
After your single_line_text_field, number_integer, or number_decimal metafields have been set up, they'll appear in the list of selectable options in your Add filters screen. You can select up to a maximum of 20 custom filters in addition to the 4 default filter options.
文章内容来源：Shopify商户官方网站
