how to implement 'OR' query in the data store fetch

The fetch method query syntax for ItemFileReadStore allows a list of attributes to match against in an "AND" fashion.
For example, a query object that looks like the following example will locate all items that have attributes of those names that match both of those

{ foo:"bar", bit:"bite"}

My question is:If I want to query the value of bit are "bite" or "byte",How do I implement the query syntax in Dojo.

做两次查询，然后将返回的items合并撒 呵呵