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demo.html
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<!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>
<link rel="stylesheet" href="pdf.css" />
</head>
<body>
<div class="frame">
<div class="center">
<div class="profile">
<div class="name">PDF转图片</div>
<div class="job">文档大小 < 20Mb</div>
<div class="actions">
<a href="javascript:;" class="btn file">上传文件<input id='pdf' type='file' accept="application/pdf"></a>
<button class="btn" id="export" disabled="disabled">导出图片</button>
<div id="export-type">
<label><input name="type" type="radio" value="jpg" checked="checked">jpg</label>
<label><input name="type" type="radio" value="png">png</label>
</div>
</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>
</div>
</div>
<div id="imgDiv"></div>
<script type="text/javascript" src="jszip.min.js"></script>
<script type="text/javascript" src="jquery-2.1.4.min.js"></script>
<script type="text/javascript" src="FileSaver.js"></script>
<script type="text/javascript" src="pdf.js"></script>
<script type="text/javascript" src="pdf.worker.js"></script>
<script>
// PDFJS.disableStream = true;
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 > 20) {
alert("文件大小不能>20M");
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.getDocument(typedarray).then(function (pdf) { //PDF转换为canvas
$("#imgDiv").css("border", "0"); //清除文本、边框
if (pdf) {
var 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;
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 types = 'jpg';
var names = document.getElementById('pdfName').getAttribute('title');
var items = document.getElementById('export-type').querySelectorAll('input');
for(var i = 0; i<items.length; i++){
items[i].i = i;
if(items[i].checked == true){
types = items[i].value;
}
}
var zip = new JSZip();
var images = zip.folder("images");
$("canvas").each(function (index, ele) {
var canvas = document.getElementById("pageNum" + (index + 1));
images.file("image-" + (index + 1) + "." + types, dataURLtoBlob(canvas.toDataURL(
"image/" + types, 1.0)), {
base64: true
});
})
zip.generateAsync({type: "blob"}).then(function (content) {
saveAs(content, names + ".zip");
});
});
</script>
</body>
</html>