Hi.
Try this
var accessOptions = {
targetEntityName: "contact",
targetEntityId: contactId,
principalEntityName: "systemuser",
principalEntityId: currentUserId
};
var retrieveAccessResponse = XrmServiceToolkit.Soap.RetrievePrincipalAccess(accessOptions);
alert("The user should have access to the contact record: " + retrieveAccessResponse);
contactId是当前记录的id, currentUserId是当前用户id. 这两个值自己编写下吧（Xrm方法就可以）。
Jaimie
