网页添加水印js

function SetMarks(marks) {

            //默认设置
            let defaultSettings = {
                watermark_txt: marks,
                watermark_x: 100,//水印起始位置x轴坐标
                watermark_y: 100,//水印起始位置Y轴坐标
                watermark_rows: 5,//水印行数
                watermark_cols: 5,//水印列数
                watermark_x_space: 100,//水印x轴间隔
                watermark_y_space: 20,//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: '16px',//水印字体大小
                watermark_font: '微软雅黑',//水印字体
                watermark_ 210,//水印宽度
                watermark_height: 100,//水印长度
                watermark_angle: 15//水印倾斜度数
            };
            Object.assign(defaultSettings, marks);
            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;
            //获取页面最大高度
            let page_height = Math.max(document.body.scrollHeight, document.body.clientHeight) + 0;//如果body未设置高度，此处可以设置默认最小高度

            //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 = "1";
                    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);
        }

在页面里调用 SetMarks() 方法即可

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <title>水印测试</title>

    <style type="text/css">

        * {
            margin: 0;
            padding: 0;
        }

        html, body {
            height: 100%;
        }

        body {
             100%;
        }


    </style>

</head>

<body>

    <div  style="margin: 50px;">

	<p>此处编辑页面内容</p>	

    </div>
    <script>		

	////// 把SetMarks() 复制到你的js代码内
	////// you javascript


	//调用设置水印方法
        SetMarks("测试水印");
	
    </script>

</body>

</html>

　　效果图：

参考： https://www.jb51.net/article/163216.htm