标签:canvas canvasWrapp const 预览 label pdf document 下载
效果
代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="google" value="notranslate" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
@media screen and (min-width: 960px) {
html,
body {
width: 960px;
margin: auto;
}
}
@media screen and (max-width: 960px) {
.canvasWrapp{
overflow-x: scroll;
}
}
@media print {
.btn {
display: none;
}
.label {
display: none;
}
canvas {
box-shadow: unset !important;
}
}
img {
width: 100%;
}
.label {
font-size: 20px;
font-weight: 700;
color: white;
margin-top: 20px;
background-color: green;
padding: 10px;
}
.canvasWrapp {
box-shadow: 0px 0px 6px #000;
}
.down {
border: green dashed 1px;
padding: 4px;
margin-top: 10px;
}
.down a {
text-decoration: none;
}
</style>
</head>
<body>
<div class="btn">
<button>打印此页面</button>
</div>
<div class="down"></div>
</body>
<script src="./lib/pdf.js"></script>
<script src="./lib/pdf.worker.js"></script>
<script>
const files = [
"http://cos.dshvv.com/aegis/pdf1.pdf",
"http://cos.dshvv.com/aegis/img1.png",
"http://cos.dshvv.com/aegis/pdf2.pdf",
"http://cos.dshvv.com/aegis/img2.png",
];
/*
* 渲染pdf
*/
const renderPdf = async (pdfUrl) => {
const loadingTask = pdfjsLib.getDocument(pdfUrl);
const pdf = await loadingTask.promise;
for (let index = 1; index < pdf.numPages + 1; index++) {
const page = await pdf.getPage(index);
// const desiredWidth = document.body.clientWidth
const desiredWidth = 960;
const viewportTemp = page.getViewport({ scale: 1 });
const scale = desiredWidth / viewportTemp.width;
console.log(scale);
const viewport = page.getViewport({ scale });
const canvas = document.createElement("canvas");
const canvasContext = canvas.getContext("2d");
canvas.height = viewport.height;
canvas.width = viewport.width;
page.render({ canvasContext, viewport });
const canvasWrapp = document.createElement('div');
canvasWrapp.className = 'canvasWrapp';
canvasWrapp.append(canvas);
document.body.append(canvasWrapp);
}
};
/*
* 入口方法
*/
async function main() {
let downHtml = "";
const fileNameReg = /(.*\/)*([^.]+).*/gi;
for (const renderItem of files) {
const extension = renderItem.substring(renderItem.lastIndexOf(".") + 1);
const fileName =
renderItem.replace(fileNameReg, "$2") + "." + extension;
downHtml += `<div><a href='${renderItem}' down='${fileName}' target='_blank'>点击下载:${fileName} ⬇️</a></div>`;
// 渲染pdf或图片
const label = document.createElement("div");
label.className = "label";
label.innerText = fileName + "
标签:canvas,canvasWrapp,const,预览,label,pdf,document,下载
来源: https://www.cnblogs.com/dshvv/p/15965439.html
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