数组去重

var arr = ['0','1','2','3','0'];
function rep(arr){
	var new_arr = [arr[0]];
	for (var i = 0; i < arr.length; i++) {
		if(new_arr.indexOf(arr[i]) == -1 ){
			new_arr.push(arr[i]);
		}
	}
	return new_arr;
}
rep(arr);
//["0", "1", "2", "3"]