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index.html
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<!DOCTYPE html>
<html>
<script>
var _hmt = _hmt || [];
(function () {
var hm = document.createElement("script");
hm.src = "https://hm.baidu.com/hm.js?e495c059c321f94f833a194c3dc8c87c";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-118964508-1"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag() { dataLayer.push(arguments); }
gtag('js', new Date());
gtag('config', 'UA-118964508-1');
</script>
<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>
<link rel="stylesheet" href="css/style.css" />
<link rel="stylesheet" type="text/css" href="css/mian.css" />
</head>
<body>
<div class="frame">
<div class="center">
<div class="profile">
<a href="https://github.com/xxlllq/pdf2img" target="_blank">
<div class="image">
<div class="circle-1"></div>
<div class="circle-2"></div>
<img src="img/James Kobe.png" width="70" height="70" alt="">
</div>
</a>
<div class="name">PDF转图片</div>
<div class="job">
文档大小
< 10Mb </div> <div class="actions">
<a href="javascript:;" class="btn file">
Choose Pdf
<input id='pdf' type='file' accept="application/pdf">
</a>
<button class="btn" id="export">Export Image</button>
<a style="display:block;margin-left:40px;"><iframe src="https://ghbtns.com/github-btn.html?user=xxlllq&repo=pdf2img&type=star&count=true&size=large"
frameborder="0" scrolling="0" width="170px" height="30px"></iframe></a>
</div>
</div>
<div class="stats">
<div class="box">
<span class="value">名称</span>
<span class="parameter" id="pdfName"></span>
</div>
<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 class="box allPage">
<span class="value all">导出整图</span>
<input type="checkbox" id="allInOnPicture" />
<span class="value all small">少于20张效果较好</span>
</div>
<div class="box pageChoose">
<span class="value all">页码选择</span>
<input type="number" id="pageChooseStart" placeholder="开始页码"/>
<input type="number" id="pageChooseEnd" placeholder="结束页码"/>
</div>
</div>
</div>
</div>
<div id="imgDiv">
</div>
<script type="text/javascript" src="js/jszip.min.js"></script>
<script type="text/javascript" src="js/jquery-2.1.4.min.js"></script>
<script type="text/javascript" src="js/FileSaver.js"></script>
<script type="text/javascript" src="js/pdf.js"></script>
<script type="text/javascript" src="js/pdf.worker.js"></script>
<script>
// PDFJS.disableStream = true;
$("#export").attr("disabled", "disabled"); //禁用导出图片按钮
var pdfFile;
$('#pdf').change(function() {
var pdfFileURL = $('#pdf').val();
if (pdfFileURL) {
$("#imgDiv").empty(); //清空上一PDF文件展示图
var files = $('#pdf').prop('files'); //获取到文件
var fileSize = files[0].size;
var mb;
if (fileSize) {
mb = fileSize / 1048576;
if (mb > 10) {
alert("文件大小不能>10M");
return;
}
}
$("#export").removeAttr("disabled", "disabled");
$("#pdfName").text(files[0].name).attr("title", files[0].name);
$("#sizeText").text(mb.toFixed(2) + "Mb");
/*pdf.js无法直接打开本地文件,所以利用FileReader转换*/
var reader = new FileReader();
reader.readAsArrayBuffer(files[0]);
reader.onload = function(e) {
var myData = new Uint8Array(e.target.result)
var docInitParams = {
data: myData
};
var typedarray = new Uint8Array(this.result);
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
$("#imgDiv").css("border", "0"); //清除文本、边框
if (pdf) {
window.pageNum = pdf.numPages;
$("#pagesText").text(pageNum);
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);
}
}
});
};
}
});
function openPage(pdfFile, pageNumber, context) {
var scale = 2;
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;
// 记录当前canvas的width，height
window.wi = canvas.width;
window.he = canvas.height;
canvas.style.width = "100%";
canvas.style.height = "100%";
var renderContext = {
canvasContext: context,
viewport: viewport
};
page.render(renderContext);
});
return;
};
//dataURL转成Blob
function dataURLtoBlob(dataurl) {
var arr = dataurl.split(','),
mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]),
n = bstr.length,
u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
return new Blob([u8arr], {
type: mime
});
}
//导出图片
$("#export").click(function() {
var zip = new JSZip();
if ($("#allInOnPicture").prop("checked")) { //导出为一张整图
var height = 0,
context, mainCanvas, b = 2; //b：整图缩放倍数
var count = $("canvas").length;
$("canvas").each(function(index, ele) {
var canvas = document.getElementById("pageNum" + (index+1));
if (canvas) {
if (index == 0) {
mainCanvas = document.createElement('canvas');
context = mainCanvas.getContext('2d');
mainCanvas.width = canvas.width / b;
mainCanvas.height = canvas.height / b * count;
context.drawImage(canvas, 0, 0, canvas.width / b, canvas.height / b);
} else {
context.drawImage(canvas, 0, height, canvas.width / b, canvas.height / b);
}
height += canvas.height / b;
}
})
if (mainCanvas) {
zip.file("image.png", dataURLtoBlob(mainCanvas.toDataURL("image/png", 1.0)), {
base64: true
});
// 或者自动下载为png
// var oA = document.createElement("a");
// oA.download = '';
// oA.href = mainCanvas.toDataURL();
// document.body.appendChild(oA);
// oA.click();
// oA.remove();
}
} else {
var images = zip.folder("images");
$("canvas").each(function(index, ele) {
var idx = index + 1;
var canvas = document.getElementById("pageNum" + idx);
var startIdx = $("#pageChooseStart").val(),endIdx=$("#pageChooseEnd").val();
if((startIdx && parseInt(startIdx) >idx) ||( endIdx && parseInt(endIdx)<idx)) {
return true;
}
images.file("image-" + idx + ".png", dataURLtoBlob(canvas.toDataURL("image/png", 1.0)), {
base64: true
});
})
}
zip.generateAsync({
type: "blob"
}).then(function(content) {
saveAs(content, "pdftoimages.zip");
});
});
</script>
</body>
</html>