一：效果
二：代码
<html>
<title>表格动态水印</title>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<script>
function watermark(settings) {
//默认设置
var defaultSettings={
watermark_objName:"t1",
watermark_txt:"text",
watermark_x:-10,//水印起始位置x轴坐标
watermark_y:40,//水印起始位置Y轴坐标
watermark_rows:20,//水印行数
watermark_cols:40,//水印列数
watermark_x_space:0,//水印x轴间隔
watermark_y_space:0,//水印y轴间隔
watermark_color:'#a09696',//水印字体颜色
watermark_alpha:0.25,//水印透明度
watermark_fontsize:'20px',//水印字体大小
watermark_font:'微软雅黑',//水印字体
watermark_width:120,//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 obj=document.getElementById(defaultSettings.watermark_objName);
var oTemp = document.createDocumentFragment();
//获取页面最大宽度
var page_width =obj.offsetWidth; //Math.max(document.body.scrollWidth,document.body.clientWidth);
//获取页面最大长度
var page_height = obj.offsetHeight ;//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 haveIt = document.getElementById('mask_div' + i + j);
if (haveIt) {
haveIt.remove();// 如果已经生成了水印 就先移除所有元素重新生成
}
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";
mask_div.style.left = x + 'px';
mask_div.style.top = y + 'px';
mask_div.style.overflow = "hidden";
mask_div.style.zIndex = "-1";
//mask_div.style.border="solid #eee 1px";
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);
};
};
//将水印添加到容器中
obj.appendChild(oTemp);
}
//传入动态水印内容
</script>
</head>
<body>
<input type="button" name="" value="点击显示水印" onclick="watermark({watermark_txt:'水印测试内容',watermark_objName:'table1'})"/>
<div id="table1" style="width:550px; height:500px;" >
<table width="500" height="500" border="">
<tr><td>1</td><td>1</td></tr>
<tr><td>1</td><td>2</td></tr>
<tr><td>1</td><td>2</td></tr>
<tr><td>1</td><td>2</td></tr>
</table>
</div>
</body>
</html>
三：参考