JavaScript adds watermark to html page

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>js页面水印</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            overflow-x: hidden;
        }

        .table-sy {
            width: 100%;
            height: 100%;
            position: absolute;
            pointer-events: none;
            /*主要是这个属性*/
            color: #d2d6d9;
            z-index: 99999999999;
        }

        .table-sy>div {
            display: flex;
            align-items: center;
            justify-content: center;
            transform: rotate(-40deg);
            float: left;
        }

        .content {
            width: 100%;
            height: 100vh;
            background: #ccc;
        }
    </style>
</head>

<body>
    <div id="sy" class="table-sy"></div>
    <div class="content"></div>
</body>
<script>
    loadSy();   //一进入页面就调用一下函数
    window.onresize = function () {    //页面大小发生改变
        loadSy();
    }
    /**
     * 页面添加水印
     */
    function loadSy() {
        var config = {
            tw: 300, //内容高度
            th: 150,  // 内容宽度
            c: 80 // 为了避免页面下方有多余的空白, 少显示一行。所以在计算每个水印高度的时候，需要加个差值，使水印分布的更均匀（一般为内容高度的一半即可）
        }
        var dom = document.getElementById("sy");
        var data = {
            name: "web张",
            code: "0534",
            day: "2023年5月6日"
        }
        var width = document.body.offsetWidth;
        dom.style.width = width + "px";
        var height = document.body.offsetHeight;
        dom.style.height = height + "px";
        var wnum = parseInt(width / config.tw) || 1;
        var hnum = parseInt(height / config.th) || 1;
        var wc = (width - wnum * config.tw) / wnum - 1 || 0;
        var hc = (height - hnum * config.th + config.c) / hnum - 1 || 0;
        var num = wnum * (hnum - 1);
        var html = [];
        for (var i = 0; i < num; i++) {
            html.push('<div style="width: ' + (config.tw + wc) + 'px;height: ' + (config.th + hc) + 'px">', data.name, '<br/>', data.code, '<br/>', data.day, '</div>');
        }
        dom.innerHTML = html.join("");
    }
</script>

</html>
JavaScript adds watermark to html page

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