问NPAPI插件在safari中不能调用js函数？

EN

NPObject* npwindow = NULL; 
NPError ret = browser->getvalue(mInstanceForJS, NPNVWindowNPObject, &npwindow); 
if (ret != NPERR_NO_ERROR) 
    return ; 
// Get window object. 
NPVariant windowVar; 
NPIdentifier winID = browser->getstringidentifier("window"); 
bool bRet = browser->getproperty(mInstanceForJS, npwindow, winID, &windowVar); 
if (!bRet) 
{ 
    browser->releaseobject(npwindow); 
    return ; 
}
NPObject* window = NPVARIANT_TO_OBJECT(windowVar);
NPVariant voidResponse;

NPVariant elementId;
STRINGZ_TO_NPVARIANT([info UTF8String], elementId);
NPVariant args[] = {elementId};

NPIdentifier funcID= browser->getstringidentifier([funName UTF8String]);
bRet = browser->invoke(mInstanceForJS, window, funcID, args, 1, &voidResponse);
browser->releasevariantvalue(&windowVar);