(function (u) {
	u = u || {};

	u.toMap = function (array, id) {
		/// <summary>将指定对象数组中的值，用id作为键生成对象</summary>

		var result = {};

		u.each(array, function (e) {
			var k = typeof (id) === 'function' ? id(e) : e[id];
			if (!result[k])
				result[k] = e;
			else
				result[k] = [
					result[k], e
				];
		});

		return result;
	};
})(_);