给html页面添加水印
看到别人的页面有水印，感觉很有趣
尝试了下给html加水印的效果，如图
实现原理：
根据页面大小，动态添加若干个div，将传递过来的文字写到div里，设置div旋转的角度、字体、字体颜色等
index.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"/> </head> <body> <div> <h6>测试页面 测试页面</h6> <h5>测试页面 测试页面</h5> <h4>测试页面 测试页面</h4> <h3>测试页面 测试页面</h3> <h2>测试页面 测试页面</h2> <h1>测试页面 测试页面</h1> </div> </body> <script src="shuiyin.js"></script> <script type="text/javascript"> var now = getNow(); watermark({"watermark_txt":"A B C X Y Z "+now}); </script> </html>
shuiyin.js
function watermark(settings) { //默认设置 var defaultSettings = { watermark_txt: "text", 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: 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: '#aaa', //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: 20 //水印倾斜度数 }; 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); var cutWidth = page_width * 0.0150; var page_width = page_width - cutWidth; //获取页面最大高度 var page_height = Math.max(document.body.scrollHeight, document.body.clientHeight) + 450; page_height = Math.max(page_height, window.innerHeight - 30); //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.className = 'mask_div'; 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"; //让水印不遮挡页面的点击事件 mask_div.style.pointerEvents = 'none'; 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); } function getNow() { var d = new Date(); var year = d.getFullYear(); var month = change(d.getMonth() + 1); var day = change(d.getDate()); var hour = change(d.getHours()); var minute = change(d.getMinutes()); var second = change(d.getSeconds()); function change(t) { if (t < 10) { return "0" + t; } else { return t; } } var time = year + '年' + month + '月' + day + '日 ' + hour + '时' + minute + '分' + second + '秒'; return time; }
