Javascript 随机显示数组元素

$(function(){
	     var wx_arr = ['gb3055','gb6365'];
		 var storage = window.localStorage;
		 function random_wx(up,low) {
            //Math.random()*(上限-下限+1)+下限 
            var i = parseInt(Math.random() * (up - low + 1) + low);
		    return i;
        }
		function check_random(){
		    var random_num = random_wx(wx_arr.length-1,0);
			if(typeof storage["cur_wx"] !== undefined){
				var store_num = parseInt(storage.getItem("cur_wx"));
				if(store_num == random_num){
					return check_random();
				}else{
					return random_num;
				}
			}else{
				return random_num;
			}
		}
		if(!window.localStorage){
            console.log("浏览器支持localstorage");
			var rand_num_1 = random_wx(wx_arr.length-1,0);
			$(".wx_num").html(wx_arr[rand_num_1]);
        }else{
			var rand_num = check_random();
            storage.setItem("cur_wx", rand_num);
			$(".wx_num").html(wx_arr[rand_num]);
        }
	});