JS给页面容器增加水印

/*
* 功能:给页面容器增加水印
*
* 用法
watermark({
  watermark_ele:'#industry-contacts',
  watermark_txt:`AI固收 ${this.sysUserInfo.phone}`,
  watermark_width: 100,//水印宽度
  watermark_rows:9,
  watermark_x_space: 0,//水印x轴间隔
  watermark_y_space: 0,//水印y轴间隔
})
*/
export function watermark(settings) {
//默认设置
  let defaultSettings = {
    watermark_ele:settings.watermark_ele||'body',
    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
    watermark_z_index:9,
  };
  Object.assign(defaultSettings, settings);
  let oTemp = document.createDocumentFragment();
  //获取页面最大宽度
  let p_width = Math.max(document.querySelector(defaultSettings.watermark_ele).scrollWidth, document.querySelector(defaultSettings.watermark_ele).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.querySelector(defaultSettings.watermark_ele).scrollHeight, document.querySelector(defaultSettings.watermark_ele).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 = defaultSettings.watermark_z_index;
      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.querySelector(defaultSettings.watermark_ele).appendChild(oTemp);
}