给原生html中添加水印遮罩层的实现示例

Kate ·

更新时间:2024-09-20

· 1879 次阅读

效果图

代码


<!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>水印遮罩</title>
</head>
<style>
    .watermark_mask {
        position: fixed;
        top: 10px;
    }
    .hello {
        width: 500px;
        height: 2048px;
        margin: 0 auto;
        background-color: pink;
    }
</style>
<body>
    <div class="hello">
        Hello World
        <div style="margin-top: 600px;">Hello World 2</div>
        <div style="margin-top: 1200px;">Hello World 3</div>
    </div>
    <div id="watermarkId" class="watermark_mask"></div>
    <script>
        const watermarkId = "watermarkId";
        // 水印遮罩函数
        function watermarkUtils(settings, id) {
            //默认设置
            var defaultSettings={
                watermark_txt: "text",
                watermark_x: 10,//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: 55,//水印行数
                watermark_cols: 55,//水印列数
                watermark_x_space: 10,//水印x轴间隔
                watermark_y_space: 10,//水印y轴间隔
                watermark_color: '#000000',//水印字体颜色
                watermark_alpha: 0.2,//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_width: 50,//水印宽度
                watermark_height: 20,//水印长度
                watermark_angle: 25//水印倾斜度数
            };
            //采用配置项替换默认值，作用类似jquery.extend
            if(typeof settings === "object") {
                var src = settings;
                for(let key in src) {
                    if(src[key] && defaultSettings[key] && src[key] === defaultSettings[key])
                    continue;
                    else if(src[key])
                    defaultSettings[key]=src[key];
                }
            }
            var oTemp = document.createDocumentFragment();
            // var oTemp = document.createElement("div");
            //获取页面最大宽度
            var page_width = Math.max(document.body.scrollWidth,document.body.clientWidth);
            //获取页面最大长度
            var page_height = Math.max(document.body.scrollHeight,document.body.clientHeight);
            //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));
            }
            var x;
            var y;
            for (var i = 0; i < defaultSettings.watermark_rows; i++) {
                y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
                for (var j = 0; j < defaultSettings.watermark_cols; j++) {
                    x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;
                    var mask_div = document.createElement('div');
                    mask_div.id = 'mask_div' + i + j;
                    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";
                    //选不中
                    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";
                    //mask_div.style.border="solid #eee 1px";
                    mask_div.style.opacity = defaultSettings.watermark_alpha;
                    mask_div.style.fontSize = defaultSettings.watermark_fontsize;
                    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);
            try {
                // console.log(document.getElementById(id), "document.getElementById(id)");
                document.getElementById(id).appendChild(oTemp);
            } catch(error) {
                console.error(error, "遮罩异常");
            }
        };
        watermarkUtils({ watermark_txt: "9527", watermark_width: 60, watermark_fontsize: "14px" }, watermarkId);
    </script>
</body>
</html>

核心代码


const watermarkId = "watermarkId";
// 水印遮罩函数
function watermarkUtils(settings, id) {
    //默认设置
    var defaultSettings={
        watermark_txt: "text",
        watermark_x: 10,//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: 55,//水印行数
        watermark_cols: 55,//水印列数
        watermark_x_space: 10,//水印x轴间隔
        watermark_y_space: 10,//水印y轴间隔
        watermark_color: '#000000',//水印字体颜色
        watermark_alpha: 0.2,//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_width: 50,//水印宽度
        watermark_height: 20,//水印长度
        watermark_angle: 25//水印倾斜度数
    };
    //采用配置项替换默认值，作用类似jquery.extend
    if(typeof settings === "object") {
        var src = settings;
        for(let key in src) {
            if(src[key] && defaultSettings[key] && src[key] === defaultSettings[key])
            continue;
            else if(src[key])
            defaultSettings[key]=src[key];
        }
    }
    var oTemp = document.createDocumentFragment();
    // var oTemp = document.createElement("div");
    //获取页面最大宽度
    var page_width = Math.max(document.body.scrollWidth,document.body.clientWidth);
    //获取页面最大长度
    var page_height = Math.max(document.body.scrollHeight,document.body.clientHeight);
    //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));
    }
    var x;
    var y;
    for (var i = 0; i < defaultSettings.watermark_rows; i++) {
        y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
        for (var j = 0; j < defaultSettings.watermark_cols; j++) {
            x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;
            var mask_div = document.createElement('div');
            mask_div.id = 'mask_div' + i + j;
            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";
            //选不中
            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";
            //mask_div.style.border="solid #eee 1px";
            mask_div.style.opacity = defaultSettings.watermark_alpha;
            mask_div.style.fontSize = defaultSettings.watermark_fontsize;
            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);
    try {
        // console.log(document.getElementById(id), "document.getElementById(id)");
        document.getElementById(id).appendChild(oTemp);
    } catch(error) {
        console.error(error, "遮罩异常");
    }
};
// 使用
watermarkUtils({ watermark_txt: "9527", watermark_width: 60, watermark_fontsize: "14px" }, watermarkId);

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