给jsp添加水印效果

话不多说直接上代码：

function waterMark(){
		$(document).ready(function() {
            //var userid=<%=id %>;
            //测试水印直接写把下面测试水印 替换为 userid 就可        //以动态添加水印了
			watermark({ watermark_txt: '测试水印' })//传入动态水印内容  可以从Session中拿出你需要的用户信息
			function watermark(settings) {
			//默认设置
			var defaultSettings={
			    watermark_txt:"text",
			    watermark_x:100,//水印起始位置x轴坐标
			    watermark_y:80,//水印起始位置Y轴坐标
			    watermark_rows:20,//水印行数
			    watermark_cols:20,//水印列数
			    watermark_x_space:100,//水印x轴间隔
			    watermark_y_space:50,//水印y轴间隔
			    watermark_color:'#000000',//水印字体颜色
			    watermark_alpha:0.3,//水印透明度
			    watermark_fontsize:'18px',//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 oTemp = document.createDocumentFragment();

			//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";
			        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.;
			        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);
			    };
			};
			document.body.appendChild(oTemp);
			// 给指定id添加水印效果
			//document.getElementById("waterMarkID").appendChild(oTemp);
			}
		});
	}
           

效果展示