js--数组去重

	function fun(arr) {
		var hash = [];
		for (var i = 0; i < arr.length; i++) {
			if (hash.indexOf(arr[i]) == -1) {
				hash.push(arr[i]);
			}
		}
		return hash;
	}
	var arr = [2, 8, 5, 0, 5, 2, 6, 7, 2];
	document.write(fun(arr));