通过js给网页加上水印背景实例

export function watermark(settings) {//默认设置let 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:15//水印倾斜度数};Object.assign(defaultSettings, settings);let oTemp = document.createDocumentFragment();//获取页面最大宽度let p_width = Math.max(document.body.scrollWidth,document.body.clientWidth);let cutWidth = p_width*0.0150;let page_width=p_width-cutWidth;//获取页面最大高度let page_height = Math.max(document.body.scrollHeight,document.body.clientHeight)+450;// let page_height = document.body.scrollHeight+document.body.scrollTop;//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));}let x;let y;for (let i = 0; i < defaultSettings.watermark_rows; i++) {y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;for (let j = 0; j < defaultSettings.watermark_cols; j++) {x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;let 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";mask_div.style.pointerEvents='none';//pointer-events:none 让水印不遮挡页面的点击事件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);}

import { watermark } from './../common/watermark';watermark({watermark_txt: '你要添加的水印'});