写一个alert弹出的页面，在微信打开时，弹出框会有“关闭网页”的默认按钮，这个怎么去掉呢？

图片说明

安卓机无法去掉，除非你自己写一个弹出的函数和页面出来

用原生的写，或者是框架。我用了vant框架的弹框解决了该问题。原生的写也不会出现这个问题的代码：

<!DOCTYPE html
    PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>简易弹出框</title>
    <style type="text/css">
        html,
        body,
        .alertShow {
            width: 100%;
            height: 100%;
            background-color: pink;
            font-size: 36px;
        }

        .mydiv {
            background-color: #fff;
            text-align: center;
            font-size: 36px;
            z-index: 99;
            width: 64%;
            height: 15%;
            left: 50%;
            top: 50%;
            position: fixed !important;
            transform: translate(-50%, -50%);
            border-radius: 20px;
        }

        .bg {
            background-color: #ccc;
            width: 100%;
            height: 100%;
            left: 0;
            top: 0;
            filter: alpha(opacity=10);
            opacity: 0.8;
            z-index: 1;
            position: fixed !important;
            position: absolute;

        }

        input[type="Submit"] {
            font-size: 45px;
        }

        .tit_pop {
            height: 160px;
            line-height: 141px;
        }

        .btn_pop {
            display: flex;
            justify-content: space-around;
            align-items: center;
            height: 100px;
            border-top: 1px solid #ccc;
        }
    </style>
    <script type="text/javascript">
        function showDiv() {
            document.getElementById('popDiv').style.display = 'block';
            document.getElementById('bg').style.display = 'block';
        }

        function cancel() {
            document.getElementById('popDiv').style.display = 'none';
            document.getElementById('bg').style.display = 'none';
        }
        function ensure() {
            document.getElementById('popDiv').style.display = 'none';
            document.getElementById('bg').style.display = 'none';
            console.log(545);
        }
    </script>

</head>

<body>

    <div class="alertShow">
        <div id="popDiv" class="mydiv" style="display:none;">
            <div class="tit_pop">弹框内容11111111</div>
            <div class="btn_pop">
                <div onclick="javascript:cancel()">取消</div>
                <div onclick="javascript:ensure()">确定</div>
            </div>

        </div>
        <div id="bg" class="bg" style="display:none;"></div>

        <div>
            <input type="Submit" name="" value="点此弹框" onclick="javascript:showDiv()" />
        </div>
    </div>
</body>

</html>