jquery - javascript return value issue -

i have javascript application in reactjs. code follows

var fnlvalue; var reportstore = assign({}, eventemitter.prototype, {     reportmemberlist: function(projectid) {         obj.projectmember(projectid, function(repose) {             fnlvalue = repose;         });         return fnlvalue;     } } 

the obj.projectmember server side calling. need return fnlvalue after getting data server side. here callback used generating bugs.

uncaught typeerror: callback not function