新增于: v15.0.0
如果表示为 <string>，该值必须是以下之一：
【If represented as a <string>, the value must be one of:】
'SHA-1''SHA-256''SHA-384''SHA-512'
如果表示为一个 <Object>，该对象必须有一个 name 属性，其值必须是上述列出的值之一。
【If represented as an <Object>, the object must have a name property
whose value is one of the above listed values.】