重複しない乱数

uniqueRandom.js

/**
 * Random numbers that do not overlap.
 * @param {Number} length 生成数
 * @param {Number} max    閾値
 * @return {Array}
 */
function uniqueRandom(length, max)
{
	var random, result = [];
	
	while (result.length < length)
	{
		random = Math.floor(Math.random() * max);
		if (result.indexOf(random) < 0) result.push(random);
	}
	
	return result;
}

/*
http://soledadpenades.com/2007/05/17/arrayindexof-in-internet-explorer/
*/
if (!Array.indexOf)
{
	Array.prototype.indexOf = function(v)
	{
		for (var i in this)
		{
			if (this[i] == v) return i;
		}
		return -1;
	}
}

jQuery依存を解消 （jQuery.inArray => Array.indexOf）