Input.GetMouseButton

static function GetMouseButton (button : int) : boolean

Description

Returns whether the given mouse button is held down.

button values are 0 for left button, 1 for right button, 2 for the middle button.

JavaScript
    // Detects clicks from the mouse and prints a message
// depending on the click detected.
function Update() {
if(Input.GetMouseButton(0))
Debug.Log("Pressed left click.");
if(Input.GetMouseButton(1))
Debug.Log("Pressed right click.");
if(Input.GetMouseButton(2))
Debug.Log("Pressed middle click.");
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Update() {
if (Input.GetMouseButton(0))
Debug.Log("Pressed left click.");

if (Input.GetMouseButton(1))
Debug.Log("Pressed right click.");

if (Input.GetMouseButton(2))
Debug.Log("Pressed middle click.");

}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Update():
if Input.GetMouseButton(0):
Debug.Log('Pressed left click.')
if Input.GetMouseButton(1):
Debug.Log('Pressed right click.')
if Input.GetMouseButton(2):
Debug.Log('Pressed middle click.')