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給原生html中添加水印遮罩層

作者：weixin_44953227 更新時間： 2022-04-09 編程語言

效果圖
在這里插入圖片描述

代碼


<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 2div>
        <div style="margin-top: 1200px;">Hello World 3div>
    div>
    <div id="watermarkId" class="watermark_mask">div>
    <script>
        const watermarkId = "watermarkId";

        // 水印遮罩函數
        function watermarkUtils(settings, id) {
            //默認設置
            var defaultSettings={
                watermark_txt: "text",
                watermark_x: 10,//水印起始位置x軸坐標
                watermark_y: 20,//水印起始位置Y軸坐標
                watermark_rows: 55,//水印行數
                watermark_cols: 55,//水印列數
                watermark_x_space: 10,//水印x軸間隔
                watermark_y_space: 10,//水印y軸間隔
                watermark_color: '#000000',//水印字體顏色
                watermark_alpha: 0.2,//水印透明度
                watermark_fontsize: '15px',//水印字體大小
                watermark_font: '微軟雅黑',//水印字體
                watermark_width: 50,//水印寬度
                watermark_height: 20,//水印長度
                watermark_angle: 25//水印傾斜度數
            };

            //采用配置項替換默認值，作用類似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");

            //獲取頁面最大寬度
            var page_width = Math.max(document.body.scrollWidth,document.body.clientWidth);
            //獲取頁面最大長度
            var page_height = Math.max(document.body.scrollHeight,document.body.clientHeight);

            //如果將水印列數設置為0，或水印列數設置過大，超過頁面最大寬度，則重新計算水印列數和水印x軸間隔
            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));
            }
            //如果將水印行數設置為0，或水印行數設置過大，超過頁面最大長度，則重新計算水印行數和水印y軸間隔
            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));
                    //設置水印div傾斜顯示
                    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";
                    //選不中
                    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, "遮罩異常");
            }
        };

        watermarkUtils({ watermark_txt: "9527", watermark_width: 60, watermark_fontsize: "14px" }, watermarkId);
    script>
body>
html>

核心代碼

const watermarkId = "watermarkId";

// 水印遮罩函數
function watermarkUtils(settings, id) {
    //默認設置
    var defaultSettings={
        watermark_txt: "text",
        watermark_x: 10,//水印起始位置x軸坐標
        watermark_y: 20,//水印起始位置Y軸坐標
        watermark_rows: 55,//水印行數
        watermark_cols: 55,//水印列數
        watermark_x_space: 10,//水印x軸間隔
        watermark_y_space: 10,//水印y軸間隔
        watermark_color: '#000000',//水印字體顏色
        watermark_alpha: 0.2,//水印透明度
        watermark_fontsize: '15px',//水印字體大小
        watermark_font: '微軟雅黑',//水印字體
        watermark_width: 50,//水印寬度
        watermark_height: 20,//水印長度
        watermark_angle: 25//水印傾斜度數
    };

    //采用配置項替換默認值，作用類似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");

    //獲取頁面最大寬度
    var page_width = Math.max(document.body.scrollWidth,document.body.clientWidth);
    //獲取頁面最大長度
    var page_height = Math.max(document.body.scrollHeight,document.body.clientHeight);

    //如果將水印列數設置為0，或水印列數設置過大，超過頁面最大寬度，則重新計算水印列數和水印x軸間隔
    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));
    }
    //如果將水印行數設置為0，或水印行數設置過大，超過頁面最大長度，則重新計算水印行數和水印y軸間隔
    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));
            //設置水印div傾斜顯示
            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";
            //選不中
            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, "遮罩異常");
    }
};

// 使用
watermarkUtils({ watermark_txt: "9527", watermark_width: 60, watermark_fontsize: "14px" }, watermarkId);

原文鏈接：https://blog.csdn.net/weixin_44953227/article/details/114287728

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