pdf.js 调用内部方法手动渲染pdf

1、整理的代码，可自己梳理

var url = '//cdn.mozilla.net/pdfjs/tracemonkey.pdf';


PDFJS.workerSrc = '//mozilla.github.io/pdf.js/build/pdf.worker.js';

var pdfDoc = null,
    pageNum = 1,
    pageRendering = false,
    pageNumPending = null,
    scale = 0.8,
    canvas = document.getElementById('the-canvas'),
    ctx = canvas.getContext('2d');

/**
 * Get page info from document, resize canvas accordingly, and render page.
 * @param num Page number.
 */
 //渲染某页pdf内容
function renderPage(num) {
  pageRendering = true;

  pdfDoc.getPage(num).then(function(page) {
    var viewport = page.getViewport(scale);
    canvas.height = viewport.height;
    canvas.width = viewport.width;

    var renderContext = {
      canvasContext: ctx,
      viewport: viewport
    };
    var renderTask = page.render(renderContext);


    renderTask.promise.then(function() {
      pageRendering = false;
      if (pageNumPending !== null) {
        renderPage(pageNumPending);
        pageNumPending = null;
      }
    });
  });

  document.getElementById('page_num').textContent = num;
}

//渲染队列
function queueRenderPage(num) {
  if (pageRendering) {
    pageNumPending = num;
  } else {
    renderPage(num);
  }
}

//预览前一页
function onPrevPage() {
  if (pageNum <= 1) {
    return;
  }
  pageNum--;
  queueRenderPage(pageNum);
}
document.getElementById('prev').addEventListener('click', onPrevPage);

//下一页
function onNextPage() {
  if (pageNum >= pdfDoc.numPages) {
    return;
  }
  pageNum++;
  queueRenderPage(pageNum);
}
document.getElementById('next').addEventListener('click', onNextPage);



PDFJS.getDocument(url).then(function(pdfDoc_) {
  pdfDoc = pdfDoc_;
  document.getElementById('page_count').textContent = pdfDoc.numPages;

  renderPage(pageNum);
});




$('#nav').on('mousewheel', function(event, delta) {
var dir = delta > 0 ? 'Up' : 'Down';
if (dir == 'Up') {
alert("向上滚动， www.imiansha.com");
} else {
alert("向下滚动");
}
return false;
});


需要监听的事件  键盘向下滚动的键，鼠标向下滚动





        /*阅读区域，渲染阅读文档*/		  
        var getPdfData = function (uri){
        	uri = $szoa_fileServiceUrl + '/file/preview?file=' + uri;
            var PDFData = "";
            $.ajax({
                type:"post",
                async:false,  //
                mimeType: 'text/pdf;charset=x-user-defined',
                //文件服务器预览接口地址（10.248.71.211:7001）
                //url:"https://csfile.szoa.sz.gov.cn/file/preview"+uri,
                url:uri,
                success:function(data){
                    PDFData = data;
        
                }
            });
            var rawLength = PDFData.length;
            //转换成pdf.js能直接解析的Uint8Array类型,见pdf.js-4068
            var arrayBf = new ArrayBuffer(rawLength)
            var array = new Uint8Array(arrayBf);
            for(i = 0; i < rawLength; i++) {
                array[i] = PDFData.charCodeAt(i) & 0xff;
            }
           DEFAULT_URL = array;
        }
		
		        	  //  $("#attachmentsView").append('
'+mdata.pdfList[i].fileName+'
');
        	  // $("#attachmentsView").append('
'+mdata.pdfList[i].fileName+'
');
			  
			  
			  
			  
			  
			  
			    `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `create_user_id` varchar(50) DEFAULT NULL,
  `last_modify_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  
  alter table hc_hotel modify column create_time timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;
  alter table hc_hotel modify column modify_time timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP;
  
  timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP

2、demo2

    
    
    
    
    


    
显示pdf文档