前端PDF文件显示到页面

  <!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
        <meta name="description" content="PDF Viewer" />
        <title>Convert PDF To Image</title>
    </head>
    <body>
        <div class="stats">
            <div class="box">
                <span class="value">大小</span>
                <span class="parameter" id="sizeText"></span>
            </div>
            <div class="box">
                <span class="value">页数</span>
                <span class="parameter" id="pagesText"></span>
            </div>
        </div>
        <div id="imgDiv" style="width: 320px; height:160px; border: 1px solid rgba(30, 135, 240, 1); border-radius: 8px; overflow: hidden;" ></div>
    </body>
    <!-- 引入jq -->
    <script type="text/javascript" src="./jq.js"></script>
    <!-- 引入pdf.js -->
    <script src="https://cdn.jsdelivr.net/npm/pdfjs-dist@2.0.288/build/pdf.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/pdfjs-dist@2.0.288/build/pdf.worker.min.js"></script>
    <script>
        //文件地址
        var pdfUrl = './dengjipai.pdf'; 
        var xhr = new XMLHttpRequest();
        xhr.open("get", pdfUrl, true);
        //至关重要
        xhr.responseType = 'arraybuffer';  //'blob'也可以，如果是'Blob'需要用FileReader转换为'arraybuffer'
        xhr.onload = function () {
            if (this.status == 200) {
                console.log(this.response ,'123');
                var oArrayBuffer  = this.response;
                console.log(oArrayBuffer);
                var fileSize = oArrayBuffer.byteLength;
                var mb = fileSize / 1048576;
                if(fileSize) {
                    mb = fileSize / 1048576;
                    if(mb > 2) {
                        alert("文件大小不能>2M");
                        return;
                    }
                }
                $("#sizeText").text(mb.toFixed(2) + "Mb");
                var typedarray = new Uint8Array(oArrayBuffer);
                //中文字体缺失
                PDFJS.cMapUrl = 'https://cdn.jsdelivr.net/npm/pdfjs-dist@2.0.288/cmaps/';
                PDFJS.cMapPacked = true;
                PDFJS.getDocument(typedarray).then(function(pdf) {  //PDF转换为canvas
                    if(pdf) {
                        console.log(pdf.numPages);
                        var pageNum = pdf.numPages;
                        $("#pagesText").text(pageNum);
                        var canvas = document.createElement('canvas');
                        canvas.id = "pageNum" + i;
                        $("#imgDiv").append(canvas);
                        var context = canvas.getContext('2d');
                        openPage(pdf, pageNum, context);
                        for(var i = 1; i <= pageNum; i++) {
                            var canvas = document.createElement('canvas');
                            canvas.id = "pageNum" + i;
                            $("#imgDiv").append(canvas);
                            var context = canvas.getContext('2d');
                            openPage(pdf, i, context);
                        }
                    }
                });
            }
        }
        xhr.send();
        function openPage(pdfFile, pageNumber, context) {
            var scale = 2; //如果清晰度模糊，可以将值调大
            pdfFile.getPage(pageNumber).then(function(page) {
                viewport = page.getViewport(scale); // reference canvas via context
                var canvas = context.canvas;
                canvas.width = viewport.width;
                canvas.height = viewport.height;
                canvas.style.width = "100%";
                canvas.style.height = "100%";
                var renderContext = {
                    canvasContext: context,
                    viewport: viewport
                };
                page.render(renderContext);
            });
        };
    </script>
</html>
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