Checks whether the event is an occurrence part of a recurring series.


Boolean return true if event is an occurrence.

Example - check whether an event is an occurrence

    var event = new{
        id: 0, //event has a default id
        recurrenceId: 1, //id of the recurrence head event
        title: "Task1",
        start: new Date("2013/4/4"),
        end: new Date("2013/4/4")

/* The result can be observed in the DevTools(F12) console of the browser. */
    console.log(event.isOccurrence()); //logs 'true'
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