在一个按钮中显示/隐藏功能(hide\u btn)

我必须为考试编写一个web应用程序(M·xle),我完全是个初学者。 希望s.o.能帮助我。

指数html(按钮):

<div id="buttons_container" class="container">
            <div class="row">
                <br>
                <button type="button" id="shuffle_btn" class="btn btn-primary">shuffle</button>

                <button type="button" id="hide_btn" class="btn btn-success">hide / show</button>
            </div>
        </div>

作用js公司:

function test_shuffle () {

var arr = ["11",
    "21","22",
    "31","32","33","34","35","36",
    "41","42","43","44","45","46",
    "51","52","53","54","55","56",
    "61","62","63","64","65","66"];

var max_index = arr.length -1;

var zufall = Math.floor(Math.random() * max_index) + 1 ;

var final = arr [zufall];

$('#ausgabe_shuffle').html(final);

}

function test_hide () {

$("hide_btn").click(function(){
$("--").hide();
});
}

事件js公司:

$(document).ready(function() {

$('body').on('click', '#shuffle_btn', function (e) {

    test_shuffle ();

});

$('body').on('click', '#hide_btn', function (e) {
    $("*").html("--");

    test_hide ();

});
});

当我现在单击hide\u btn时,所有内容都会消失,并显示“-”。点击有效,但我想隐藏从数组中获得的数字,例如“32”

提前非常感谢