Add both the Js and the C# script to a same GameObject

csOne.cs

using Unity.Engine;
using System.Collection;

public class csOne : MonoBehaviour 
{
	public jsOne jsOneClass;
	
	void Start()
	{
		jsOneClass = GetComponent("jsOne");
		jsOneClass.say("Hai");
	}
	
	public void  say(string message)
	{
		Debug.Log("From C#: "+message);
	}	
}


//DO NOT COPY THIS CREDITs
// author: ihsanberahim.com
// work for: fiction-labs.com
// work for: pkmedia.com.my

jsOne.js

// GUIDES:
//
// + All Js files should be in "Standard Assets"
// Example:
// ..../Assets/Standard Assets/jsOne.js
//
// + comment "#pragma strict" or it will cause an error
//#pragma strict

var csOneClass;

function Start()
{
	csOneClass = GetComponent("csOne");
	csOneClass.say("hai");
}

public function say(message)
{
	Debug.Log("From Js: "+message);
}


//DO NOT COPY THIS CREDITs
// author: ihsanberahim.com
// work for: fiction-labs.com
// work for: pkmedia.com.my