前端水印

水印 水印代码放置在index.html中

HTML

<div id="waterMark"></div>
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JS

  var oWaterMark = document.getElementById("waterMark");
  //  水印
  function watermark(settings) {
    //默认设置
    var defaultSettings = {
      watermark_txt: "text",
      watermark_x: 10,//水印起始位置x轴坐标
      watermark_y: 30,//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: 50,//水印x轴间隔
      watermark_y_space: 50,//水印y轴间隔
      watermark_background:"url(https://work.alibaba-inc.com/home/watermark.do) repeat", 
      watermark_color: '#aaa',//水印字体颜色
      watermark_alpha: 0.5,//水印透明度
      watermark_fontsize: '20px',//水印字体大小
      watermark_font: 'Microsoft Yahei',//水印字体
      watermark_width: 220,//水印宽度
      watermark_height: 100,//水印高度
      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 (var 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 = window.innerWidth - 40;
    //获取页面最大高度
    var page_height = document.body.scrollHeight;// window.innerHeight;

    //  计算水印列数
    defaultSettings.watermark_cols = parseInt((page_width - defaultSettings.watermark_x * 2) / (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));

    //  计算水印行数
    defaultSettings.watermark_rows = parseInt((page_height - defaultSettings.watermark_y * 2) / (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 = "999999";
        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.background = defaultSettings.watermark_background;
        mask_div.style.textAlign = "center";
        mask_div.style.display = "flex";
        mask_div.style.alignItems = "center";
        mask_div.style.justifyContent = "center";
        mask_div.style.width = defaultSettings.watermark_width + 'px';
        mask_div.style.height = defaultSettings.watermark_height + 'px';

        oTemp.appendChild(mask_div);
      }
      ;
    }
    ;
    oWaterMark.appendChild(oTemp);
  }

  //水印绘制
  function waterMarkRender() {
      watermark({watermark_txt: "zzz" );
  };

  function onDomResize() {
    oWaterMark.innerHTML = "";
    waterMarkRender();
  }

  window.addEventListener("load", waterMarkRender)

  window.addEventListener("resize",onDomResize);
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具体水印自定义设置即可，这里贴上作为参考

转载于:https://juejin.im/post/5bc018b3e51d450e436999ad