the name of the parameter
Error if parameterName is not a valid string
// Ex. url is = ***http://localhost:8080/services/ng#ngProjectId=0&myvar=test***
JMap.History.popHashParameters("myvar")
// The url is now = ***http://localhost:8080/services/ng#ngProjectId=0***
JMap.History.popHashParameters
You can remove a parameter in the url hash.
Don't throw an error if the parameter doesn't exist.