通过js渲染高层级DOM实现网页加水印

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Watermarks</title>
    </head>
    <style type="text/css">
        html,
        body {
            height: 100vh;
            width: 100%;
            overflow: hidden;
        }
    </style>
    <body>
        <script>
            watermark({
                watermark_txt: 'qinhuansky'  //设置水印文本
            });

            function watermark(settings) {
                //默认设置
                let defaultSettings = {
                    watermark_txt: "text",
                    watermark_x: 20, //水印起始位置x轴坐标
                    watermark_y: 20, //水印起始位置Y轴坐标
                    watermark_rows: 20, //水印行数
                    watermark_cols: 20, //水印列数
                    watermark_x_space: 80, //水印x轴间隔
                    watermark_y_space: 50, //水印y轴间隔
                    watermark_color: '#aaa', //水印字体颜色
                    watermark_alpha: 0.3, //水印透明度
                    watermark_fontsize: '15px', //水印字体大小
                    watermark_font: '微软雅黑', //水印字体
                    watermark_ 100, //水印宽度
                    watermark_height: 50, //水印长度
                    watermark_angle: 15 //水印倾斜度数
                };
                Object.assign(defaultSettings, settings);
                let oTemp = document.createDocumentFragment();
                //获取页面最大宽度
                // let p_width = Math.max(document.body.scrollWidth, document.body.clientWidth);
                // let cutWidth = p_width * 0.0150;
                // let page_width = p_width - cutWidth;
                let page_width = document.body.clientWidth;
                //获取页面最大高度
                // let page_height = Math.max(document.body.scrollHeight, document.body.clientHeight) + 450;
                let page_height = document.body.scrollHeight + document.body.scrollTop;
                //如果将水印列数设置为0,或水印列数设置过大,超过页面最大宽度,则重新计算水印列数和水印x轴间隔
                if (defaultSettings.watermark_cols === 0 || (parseInt(defaultSettings.watermark_x + defaultSettings.watermark_width *
                            defaultSettings.watermark_cols + defaultSettings.watermark_x_space * (defaultSettings.watermark_cols - 1)) >
                        page_width)) {
                    defaultSettings.watermark_cols = parseInt((page_width - defaultSettings.watermark_x + defaultSettings.watermark_x_space) /
                        (defaultSettings.watermark_width + defaultSettings.watermark_x_space));
                    defaultSettings.watermark_x_space = parseInt((page_width - defaultSettings.watermark_x - defaultSettings.watermark_width *
                        defaultSettings.watermark_cols) / (defaultSettings.watermark_cols - 1));
                }
                //如果将水印行数设置为0,或水印行数设置过大,超过页面最大长度,则重新计算水印行数和水印y轴间隔
                if (defaultSettings.watermark_rows === 0 || (parseInt(defaultSettings.watermark_y + defaultSettings.watermark_height *
                            defaultSettings.watermark_rows + defaultSettings.watermark_y_space * (defaultSettings.watermark_rows - 1)) >
                        page_height)) {
                    defaultSettings.watermark_rows = parseInt((defaultSettings.watermark_y_space + page_height - defaultSettings.watermark_y) /
                        (defaultSettings.watermark_height + defaultSettings.watermark_y_space));
                    defaultSettings.watermark_y_space = parseInt(((page_height - defaultSettings.watermark_y) - defaultSettings.watermark_height *
                        defaultSettings.watermark_rows) / (defaultSettings.watermark_rows - 1));
                }
                let x;
                let y;
                for (let i = 0; i < defaultSettings.watermark_rows; i++) {
                    y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
                    for (let j = 0; j < defaultSettings.watermark_cols; j++) {
                        x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;
                        let mask_div = document.createElement('div');
                        mask_div.id = 'mask_div' + i + j;
                        mask_div.className = 'mask_div';
                        mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
                        //设置水印div倾斜显示
                        mask_div.style.webkitTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                        mask_div.style.MozTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                        mask_div.style.msTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                        mask_div.style.OTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                        mask_div.style.transform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                        mask_div.style.visibility = "";
                        mask_div.style.position = "absolute";
                        mask_div.style.left = x + 'px';
                        mask_div.style.top = y + 'px';
                        mask_div.style.overflow = "hidden";
                        mask_div.style.zIndex = "9999";
                        mask_div.style.pointerEvents = 'none'; //pointer-events:none 让水印不遮挡页面的点击事件
                        mask_div.style.opacity = defaultSettings.watermark_alpha;
                        mask_div.style.fontSize = defaultSettings.watermark_fontsize;
                        mask_div.style.fontFamily = defaultSettings.watermark_font;
                        mask_div.style.color = defaultSettings.watermark_color;
                        mask_div.style.textAlign = "center";
                        mask_div.style.width = defaultSettings.watermark_width + 'px';
                        mask_div.style.height = defaultSettings.watermark_height + 'px';
                        mask_div.style.display = "block";
                        oTemp.appendChild(mask_div);
                    };
                };
                document.body.appendChild(oTemp);
            }
        </script>
    </body>

原文链接 :https://www.jb51.net/article/163216.htm (在此做记录,侵权立删)

本想把日子过成诗,时而简单,时而精致,不料日子却过成了一首歌,时而不靠谱,时而不着调
原文地址:https://www.cnblogs.com/chuanq/p/11951358.html