给原生html中添加水印遮罩层的实现示例

    
 Hello World 
Hello World 2
Hello World 3

 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