原生JS添加唯一水印图层

添加水印的基本思路，新建一个div盒子，让盒子始终布满整个屏幕，然后给这个盒子上面添加水印字体，形成水印的效果。因此需要一个水印的盒子：

<div id="watermarkId" class="watermarkId"></div>

.watermarkId
	{position: fixed;
	width: 100%;
	top:10px;}

 这里我是通过获取了document里面的cookie，并且进行筛选，选择出cookie中的用户名（username），把他当做水印内容，设置到最后的watermark——txt里面，实现动态添加唯一水印，如果没有cookie，就会默认展示text

余奔
内容管理平台，pc，移动版的放在泰助理上移动工具
移动端的审批
黄梅朱辉通过泰家园审批
MP4文件传输
业务进展

00:06
泰家园集成对接手册2021版本 
你可阅读
chrome扩展
292.6 KB
.watermarkId
	{position: fixed;
	width: 100%;
	top:10px;}
table
	{margin: 0 auto;}
<div id="watermarkId" class="watermarkId"></div>
  <table width="845" border="0" cellpadding="0" cellspacing="0" style='width:633.75pt;border-collapse:collapse;'>
</table>
<script>
	//获取cookie的username
	var cookieObj=document.cookie.split(";");
	for(var i=0;i<cookieObj.length;i++){
		cookieSplit=cookieObj[i].split("=");	
		if(cookieSplit[0]==" userName"){
		var username=cookieSplit[1];
		}
	}
	console.log(username)
	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: 40,//水印x轴间隔
		watermark_y_space: 40,//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: username, watermark_width: 80, watermark_fontsize: "14px" }, watermarkId);
	</script>

​​

下面是效果