Input.GetMouseButtonDown(0) check if is on button code example

Example 1: how to detect a mouse click in unity

using UnityEngine;
using System.Collections;

		if (Input.GetMouseButtonDown(0)) {
        	//Left Mouse Button
        } else if (Input.GetMouseButtonDown(1)) {
        	//Right Mouse Button
        } if (Input.GetMouseButtonDown(2)) {
        	//Middle Mouse Button
        }

Example 2: unity left mouse button

//Key Code in the Input Project Settings is "mouse 0"
Input.GetKey(KeyCode.Mouse0))