Event.clickCount

Description

How many consecutive mouse clicks have we received.

Used in EventType.MouseDown event; use this to differentiate between a single and double clicks.

function OnGUI() {
    var e : Event = Event.current;
    if (e.isMouse) {
        Debug.Log("Mouse clicks: " + e.clickCount);
    }
}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnGUI() {
        Event e = Event.current;
        if (e.isMouse)
            Debug.Log("Mouse clicks: " + e.clickCount);
        
    }
}