前端js生成水印
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport"
content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no">
<title>前端js生成水印</title>
<style>
html,
body {
/*height: 100%;*/
/*overflow: hidden;*/
overflow-x: hidden;
}
</style>
</head>
<body>
<div style="height:2200px;background-color:#799ec2;">
</div>
</body>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
watermark();
function watermark(settings) {
//默认设置
var defaultSettings = {
watermarl_element: "body",
watermark_txt: "http://code.cent123.com<br>123",
watermark_img: '',
watermark_x: 20, //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: 9, //水印行数
watermark_cols: 10, //水印列数
watermark_x_space: 50, //水印x轴间隔
watermark_y_space: 30, //水印y轴间隔
watermark_color: '#000', //水印字体颜色
watermark_alpha: 0.4, //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: 200, //水印宽度
watermark_height: 80, //水印长度
watermark_angle: 15 //水印倾斜度数
};
//采用配置项替换默认值，作用类似jquery.extend
if (arguments.length === 1 && typeof arguments[0] === "object") {
var src = arguments[0] || {};
for (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 maskElement = document.getElementById(defaultSettings.watermarl_element) || document.body;
//获取页面最大宽度
var page_width = Math.max(maskElement.scrollWidth, maskElement.clientWidth);
//获取页面最大高度
var page_height = Math.max(maskElement.scrollHeight, maskElement.clientHeight);
//水印数量自适应元素区域尺寸
defaultSettings.watermark_cols = Math.ceil(page_width / (defaultSettings.watermark_x_space + defaultSettings
.watermark_width));
defaultSettings.watermark_rows = Math.ceil(page_height / (defaultSettings.watermark_y_space + defaultSettings
.watermark_height));
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');
var mask_img = document.createElement('img');
mask_div.id = 'mask_div' + i + j;
mask_div.className = 'mask_div';
mask_img.className = 'mask_img';
//mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
mask_div.innerHTML = (defaultSettings.watermark_txt);
mask_img.src = defaultSettings.watermark_img;
mask_img.style.width = "150px";
mask_img.style.height = "50px";
// 空白图片会有占位,判断src为空时移除img标签 不为空时添加img
if (defaultSettings.watermark_img == "") {
mask_div.remove(mask_img);
} else {
mask_div.append(mask_img);
}
//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";
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'; //pointer-events:none 让水印不遮挡页面的点击事件
//mask_div.style.border="solid #eee 1px"; //兼容IE9以下的透明度设置 mask_div.style.filter="alpha(opacity=50)";
mask_div.style.opacity = defaultSettings.watermark_alpha;
mask_div.style.fontSize = defaultSettings.watermark_fontsize;
mask_div.style.fontFamily = defaultSettings.watermark_font;
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);
}
;
}
;
maskElement.appendChild(oTemp);
var remove = function (settings) {
maskElement.removeChild(oTemp);
}
}
</script>
</html>
