用pdf.js在线预览pdf

效果图

pc:

移动：

兼容性：主流浏览器+Ie11均正常显示

              移动端 微信浏览器正常显示

  预览展示

方案1

js包引入，跳转页面展示pdf,实现在线预览

window.open('./js/pdf/web/viewer.html?file=' + pdf线上地址https://www.wulihub.com.cn/gc/QabZdp/pdf/1.pdf, 'PDF');

 代码下载：

​​https://github.com/GoTing/pdf​​

禁止下载：

  1.将viewer.html下载按钮隐藏，也可以注释（注释后需要在viewer.js中将获取下载按钮的相关内容全部注释，保证不报错）

viewe.js中注释： 将下载按钮的相关js功能注释掉

当viewer.html得元素被注释，需要将viewer.js内所有得有关于download的内容全部注释

 效果：无法下载了

添加水印

1.固定水印

在viewer.js中添加水印

 完整代码添加：

var cover = document.createElement('div');
            cover.className = "cover";
            var defaultSettings = {
              watermark_txt: "郭婷",
              watermark_x: 0, //水印起始位置x轴坐标
              watermark_y: 0, //水印起始位置Y轴坐标
              watermark_rows: 30, //水印行数
              watermark_cols: 100, //水印列数
              watermark_x_space: 10, //水印x轴间隔
              watermark_y_space: 10, //水印y轴间隔
              watermark_color: 'red', //水印字体颜色
              watermark_alpha: 0.3, //水印透明度
              watermark_fontsize: '20px', //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: 45 //水印倾斜度数
            };
            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);

            //         //获取页面最大宽度
            //         var page_width = parseInt(canvasWrapper.style.width);
            // //获取页面最大长度
            //         var page_height = parseInt(canvasWrapper.style.height);
            //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";
                //奇偶行错开，这样水印就不对齐，显的不呆板
                if (i % 2 != 0) {
                  mask_div.style.left = x + 100 + 'px';
                } else {
                  mask_div.style.left = x + 'px';
                }
                mask_div.style.top = y + 'px';
                mask_div.style.overflow = "hidden";
                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 = canvasWrapper.style.width + 'px';
                mask_div.style.height = canvasWrapper.style.height + 'px';
                mask_div.style.display = "block";
                oTemp.appendChild(mask_div);
              }
            }
            cover.appendChild(oTemp);

//  水印结束
            if (this.annotationLayer && this.annotationLayer.div) {
              div.insertBefore(textLayerDiv, this.annotationLayer.div);
              //水印
              div.appendChild(cover);
              //水印结束
            } else {
              div.appendChild(textLayerDiv);
              //水印
              div.appendChild(cover);
              //水印结束
            }
            textLayer = this.textLayerFactory.createTextLayerBuilder(textLayerDiv, this.id - 1, this.viewport, this.enhanceTextSelection);
            //水印
            var cover = document.getElementsByClassName('cover');
            for (var i = 0, len = cover.length; i < len; i++) {
              cover[i].style.width = canvasWrapper.style.width;
              cover[i].style.height = canvasWrapper.style.height;
            }
            //水印结束