HTML中如何添加水印遮罩层

本篇内容介绍了"HTML中如何添加水印遮罩层"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

代码：

                    
        Hello World        
Hello World 2
        
Hello World 3
    
    
    

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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