JS为页面添加水印效果

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我是靠谱客的博主烂漫白开水，最近开发中收集的这篇文章主要介绍JS为页面添加水印效果，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>水印</title>
<style>
#water-div{pointer-events:none;position:fixed;top:0;left:0;right:0;bottom:0;}
.mask_div{pointer-events:none;}
</style>
</head>
<body>
<div style="height:1000px;text-align:center;">
<div>页面水印效果展现</div>
<div>页面水印效果展现</div>
<div>页面水印效果展现</div>
<div>页面水印效果展现</div>
<div>页面水印效果展现</div>
<div>页面水印效果展现</div>
<div>页面水印效果展现</div>
<div>页面水印效果展现</div>
<div>页面水印效果展现</div>
</div>
<div id="water-div"></div>
<script>
var txt = "水印内容<br>warter";
watermark(txt);
//监听窗口变动
window.onresize = function() {
watermark(txt);
}
function watermark(txt) {
//初始设置水印容器高度
var water = document.getElementById("water-div");
water.innerHTML = "";
water.style.height = window.screen.availHeight + "px";
water.style.height = document.documentElement.clientHeight + "px";
//水印样式默认设置
var defaultSettings={
watermark_txt:txt,
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:2000,//水印行数
watermark_cols:2000,//水印列数
watermark_x_space:70,//水印x轴间隔
watermark_y_space:30,//水印y轴间隔
watermark_color:'#aaaaaa',//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:210,//水印宽度
watermark_height:80,//水印长度
watermark_angle:15//水印倾斜度数
};
//获取页面最大宽度
var page_width = Math.max(water.scrollWidth,water.clientWidth);
//获取页面最大高度
var page_height = Math.max(water.scrollHeight,water.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');
//mask_div.id = 'mask_div' + i + j;
mask_div.className = 'mask_div';
//mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
mask_div.innerHTML=(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";
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";
water.appendChild(mask_div);
}
}
}
</script>
</body>
</html>