{"id":10854,"date":"2023-06-04T15:07:46","date_gmt":"2023-06-04T07:07:46","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=10854"},"modified":"2023-06-04T15:07:46","modified_gmt":"2023-06-04T07:07:46","slug":"js-canvas-jspdf-export-pdf","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2023\/06\/js-canvas-jspdf-export-pdf\/","title":{"rendered":"\u4f7f\u7528jsPDF\u5bfc\u51faPDF\u6587\u4ef6\u5b9e\u8df5\u5206\u4eab"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=10854\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=10854<\/a> \u946b\u7a7a\u95f4-\u946b\u751f\u6d3b<br \/>\n\u672c\u6587\u6b22\u8fce\u5206\u4eab\u4e0e\u805a\u5408\uff0c\u5168\u6587\u8f6c\u8f7d\u5c31\u4e0d\u5fc5\u4e86\uff0c\u5c0a\u91cd\u7248\u6743\uff0c\u5708\u5b50\u5c31\u8fd9\u4e48\u5927\uff0c\u82e5\u6025\u7528\u53ef\u4ee5\u8054\u7cfb\u6388\u6743\u3002<\/p>\n<p><script>window.wxShareImgUrl = 'https:\/\/www.zhangxinxu.com\/study\/image\/share\/202306-jspdf.png';<\/script><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/pdf-cover.png\" width=\"359\" height=\"221\" alt=\"PDF\u5c01\u9762\u56fe\" class=\"alignright clip thumb size-medium\" \/><\/p>\n<h3>\u4e00\u3001jsPDF\u9879\u76ee\u7b80\u4ecb<\/h3>\n<p>\u6700\u8fd1\u9047\u5230\u4e2a\u9700\u8981\u5c06\u7f51\u9875\u4e2d\u7279\u5b9a\u5185\u5bb9\u8f6c\u4e3aPDF\u7684\u9700\u6c42\uff0c\u6240\u4ee5\u6709\u673a\u4f1a\u8bd5\u7528\u4e86\u4e0bjsPDF\uff0c\u4e5f\u9047\u5230\u4e86\u4e00\u4e9b\u95ee\u9898\uff0c\u8fd9\u91cc\u5206\u4eab\u7ed9\u5927\u5bb6\u4e86\u3002<\/p>\n<p>\u9996\u5148\uff0c\u9879\u76ee\u5730\u5740\uff1a<a href=\"https:\/\/github.com\/parallax\/jsPDF\" rel=\"noopener\" target=\"_blank\">https:\/\/github.com\/parallax\/jsPDF<\/a><\/p>\n<p>\u76ee\u524d2.6\u4e07\u7684star\u6570\uff0c\u53ef\u4ee5\u8bf4\u662fGithub\u4e0aTop\u7ea7\u522b\u7684\u9879\u76ee\u4e86\uff0c\u4e5f\u662fWeb\u5bfcPDF\u7684\u9996\u9009\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202305\/2023-05-29_213815.png\" width=\"227\" height=\"162\" alt=\"Star\u6570\u76ee\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u5b98\u65b9\u7684\u4f7f\u7528\u793a\u610f\u4e5f\u5f88\u7b80\u5355\uff0c\u6784\u9020\uff0c\u5185\u5bb9\u548c\u4fdd\u6301\u3002<\/p>\n<pre>import { jsPDF } from \"jspdf\";\r\n\r\n\/\/ \u9ed8\u8ba4\u662f a4 \u7eb8\u5f20\u5c3a\u5bf8\uff0c\u7eb5\u5411\uff0c\u5355\u4f4d\u662fmm\r\nconst doc = new jsPDF();\r\n\r\ndoc.text(\"Hello world!\", 10, 10);\r\ndoc.save(\"a4.pdf\");<\/pre>\n<p>\u597d\uff0c\u63a5\u4e0b\u6765\uff0c\u5c31\u662f\u628a\u9875\u9762\u4e2d\u7684DOM\u5185\u5bb9\u4f5c\u4e3aPDF\u5185\u5bb9\u5c31\u53ef\u4ee5\u4e86\uff0c\u7406\u8bba\u4e0a\u5982\u6b64\uff0c\u4f46\u5b9e\u9645\u4f7f\u7528\u5374\u4ee4\u4eba\u6df1\u601d\u3002<\/p>\n<h3>\u4e8c\u3001\u5185\u7f6ehtml()\u65b9\u6cd5\u60ca\u4e3a\u5929\u4eba<\/h3>\n<p>jsPDF\u5185\u7f6e\u4e00\u4e2a\u540d\u4e3ahtml()\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u76f4\u63a5\u8ba9HTML\u5143\u7d20\u4f5c\u4e3aPDF\u7684\u5185\u5bb9\u3002<\/p>\n<pre>var doc = new jsPDF();\r\n\/\/ element\u5c31\u662f\u9700\u8981\u8f6c\u53d8\u4e3apdf\u7684DOM\u5143\u7d20\r\ndoc.html(element, {\r\n   callback: function (doc) {\r\n     doc.save();\r\n   },\r\n   x: 10,\r\n   y: 10\r\n});<\/pre>\n<p>\u7ed3\u679c\u6211\u8bd5\u4e86\u4e0b\uff0c\u6548\u679c\u60ca\u4e3a\u5929\u4eba\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202305\/pdf-html.jpg\" width=\"480\" height=\"221\" alt=\"\u5185\u7f6ehtml\u65b9\u6cd5\u7684\u60ca\u4eba\u6548\u679c\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u7814\u7a76\u4e00\u756a\uff0c\u53d1\u73b0\u662f\u8981\u5bfc\u5165\u5b8c\u6574\u7684\u4e2d\u6587\u5b57\u4f53\uff0c\u800c\u4e00\u4e2a\u4e2d\u6587\u5b57\u4f53\uff0c\u5c11\u8bf45-6M\uff0c\u5728Web\u8fd9\u79cd\u573a\u666f\u4e0b\u5c31\u4e0d\u592a\u5408\u9002\u3002<\/p>\n<p>\u4e8e\u662f\u6539\u53d8\u7b56\u7565\uff0c\u51b3\u5b9a\u5148\u7528html2canvas\u5c06\u5185\u5bb9\u8f6c\u6210\u56fe\u7247\uff0c\u518d\u4ee5\u56fe\u7247\u7684\u65b9\u5f0f\uff0c\u4e00\u9875\u4e00\u9875\u5730\u63d2\u5165\u5230PDF\u4e2d\uff0c\u5b9e\u73b0\u6210\u672c\u4f1a\u4f4e\u5f88\u591a\uff0c\u4e0d\u8db3\u5c31\u662f\u6587\u5b57\u65e0\u6cd5\u9009\u62e9\u3002<\/p>\n<h3>\u4e09\u3001\u501f\u52a9html2canvas<\/h3>\n<p>html2canvas\u8fd9\u4e2a\u9879\u76ee\u4e4b\u524d\u4e5f\u6709\u63d0\u8fc7\uff0c\u63a5\u8fd13\u4e07 Star\uff0c\u4e5f\u662fGithub\u4e0a\u7684\u9876\u7ea7\u5f00\u6e90\u9879\u76ee\u3002<\/p>\n<p>\u9879\u76ee\u5730\u5740\uff1a<a href=\"https:\/\/github.com\/niklasvh\/html2canvas\" rel=\"noopener\" target=\"_blank\">https:\/\/github.com\/niklasvh\/html2canvas<\/a><\/p>\n<h4>\u6781\u7b80\u4f7f\u7528\u793a\u610f<\/h4>\n<p>\u8fd9\u91cc\u5feb\u901f\u6f14\u793a\u4e0b\u5982\u4f55\u4f7f\u7528html2canvas\u548cjsPDF\u751f\u6210PDF\u6587\u4ef6\u3002<\/p>\n<p>\u5047\u8bbe\u9875\u9762\u4e0a\u6709\u4e2a\u5e03\u5c40\u5143\u7d20\uff0cid\u5c5e\u6027\u503c\u662felement\uff0c\u6548\u679c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/2023-06-01_224855.png\" width=\"342\" height=\"180\" alt=\"\u793a\u610f\u5e03\u5c40\u56fe\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u5219\u4e0b\u9762\u7684\u8fd9\u6bb5\u4ee3\u7801\u5c31\u53ef\u4ee5\u8ba9\u8fd9\u6bb5\u5e03\u5c40\u5185\u5bb9\u53d8\u6210PDF\u6587\u4ef6\u4e0b\u8f7d\u4e0b\u6765\u3002<\/p>\n<pre>&lt;script src=\".\/html2canvas.min.js\"&gt;&lt;\/script&gt;\r\n&lt;script src=\".\/jspdf.umd.min.js\"&gt;&lt;\/script&gt;\r\n&lt;script&gt;\r\nvar pdf = new jspdf.jsPDF();\r\nhtml2canvas(target).then(function(canvas) {\r\n    pdf.addImage(canvas.toDataURL('image\/jpeg'), 10, 10);\r\n    pdf.save('mybook.pdf');\r\n});\r\n&lt;\/script&gt;<\/pre>\n<p>\u6b64\u65f6\u7684PDF\u6253\u5f00\u6548\u679c\u5c31\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/2023-06-01_225136.png\" width=\"480\" height=\"334\" alt=\"PDF\u6548\u679c\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u773c\u89c1\u4e3a\u5b9e\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202306\/html2canvas-pdf-simple-demo.php\" rel=\"noopener\" target=\"_blank\">html2canvs\u4e0ejspdf\u751f\u6210PDF\u7b80\u6613demo<\/a><\/p>\n<p>\u7136\u800c\uff0c\u771f\u5b9e\u7684\u9879\u76ee\u5f00\u53d1\u8981\u6bd4demo\u9875\u9762\u9ebb\u70e6\u7684\u591a\u3002<\/p>\n<p>\u51e0\u4e4e\u5927\u591a\u6570\u4eba\u4e00\u5b9a\u4f1a\u9047\u5230\u7684\u95ee\u9898\uff0c\u90a3\u5c31\u662f\u5982\u679chtml2canvas\u751f\u6210\u7684\u56fe\u7247\u8fc7\u957f\uff0c\u8be5\u5982\u4f55\u5728PDF\u4e2d\u5206\u9875\u3002<\/p>\n<p>\u4ee5\u53ca\uff0c\u56fe\u7247\u8de8\u57df\u4e86\uff0c\u53c8\u5f53\u5982\u4f55\u5904\u7406\uff1f<\/p>\n<h3>\u56db\u3001\u56fe\u7247\u8de8\u57df\u548c\u5206\u9875\u7684\u95ee\u9898<\/h3>\n<p>canvas\u4e0e\u56fe\u7247\u8de8\u57df\u7684\u95ee\u9898\uff0c\u6211\u4e4b\u524d\u4e13\u95e8\u64b0\u6587\u8bb2\u89e3\u8fc7\uff0c\u4f20\u9001\u95e8\u5730\u5740\uff1a\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2018\/02\/crossorigin-canvas-getimagedata-cors\/\">\u89e3\u51b3canvas\u56fe\u7247getImageData,toDataURL\u8de8\u57df\u95ee\u9898<\/a>\u201d<\/p>\n<p>\u91cc\u9762\u7684\u65b9\u6cd5\u867d\u591a\uff0c\u6839\u636e\u6211\u591a\u5e74\u7684\u5b9e\u8df5\uff0c\u8fd8\u662f\u670d\u52a1\u5668\u8bbe\u7f6e<code>Access-Control-Allow-Origin<\/code>\u8fd0\u884c\u8bbf\u95ee\uff0c\u524d\u7aeffetch\u6216XMLHttpRequest\u83b7\u53d6\u56fe\u7247\u6570\u636e\u7684\u7b56\u7565\u6700\u597d\u7528\u3002<\/p>\n<p>\u4ee5fetch\u4e3e\u4f8b\uff0c\u60f3\u8981\u83b7\u5f97\u4e00\u4e2a\u56fe\u7247\u5730\u5740\u662f imgUrl \u7684\u56fe\u50cf\u6570\u636e\uff0c\u53ef\u4ee5\u8fd9\u4e48\u5904\u7406\uff1a<\/p>\n<pre>fetch(imgUrl).then(res =&gt; res.blob()).then(blob =&gt; {\r\n  var reader = new FileReader() ;\r\n  reader.onload = function () {\r\n    \/\/ this.result \u5c31\u662f\u56fe\u7247\u7684base64\u5730\u5740\r\n  };\r\n  reader.readAsDataURL(blob) ;\r\n})<\/pre>\n<p>\u4e3a\u4f55\u9700\u8981\u8f6c\u6210base64\u5462\uff1f\u56e0\u4e3a\u6839\u636e\u6211\u7684\u5b9e\u8df5\uff0chtml2canvas\u5185\u5bb9\u4e2d\u7684\u56fe\u7247\u5730\u5740\uff0c\u9700\u8981\u8f6c\u6362\u6210base64\u5730\u5740\uff0c\u624d\u80fd\u771f\u6b63\u53ef\u7528\u3002<\/p>\n<h4>\u5206\u9875\u7684\u95ee\u9898<\/h4>\n<p>\u5206\u9875\u7684\u95ee\u9898\u53ef\u4ee5\u4f7f\u7528\u4ee3\u7801\u641e\u5b9a\uff0c\u8bbe\u7f6e\u597d\u6bcf\u4e00\u9875PDF\u7684\u9ad8\u5ea6\uff0c\u7136\u540ecanvas\u7684\u9ad8\u5ea6\u4e00\u9875\u4e00\u9875\u526a\u6389\u518d\u5206\u522b\u6dfb\u52a0\u5373\u53ef\u3002<\/p>\n<p>\u8fd9\u91cc\u5c31\u6709\u4e00\u4e9b\u9700\u8981\u63d0\u524d\u77e5\u9053\u7684\uff0c\u5173\u4e8e\u5c3a\u5bf8\u7684\u77e5\u8bc6\u3002<\/p>\n<p>\u5f53\u6211\u4eec\u6784\u9020\u4e00\u4e2a pdf \u5b9e\u4f8b\u7684\u65f6\u5019\uff0c\u5982\u679c\u4e0d\u8bbe\u7f6e\u4efb\u4f55\u53c2\u6570\uff0c\u5219\u5176\u5c3a\u5bf8\u662f A4 \u7eb8\u7684\u5c3a\u5bf8\uff0c210\u6beb\u7c73\u00d7297\u6beb\u7c73\u3002<\/p>\n<p>\u6839\u636e\u6211\u7684\u5b9e\u8df5\uff0c\u8fd9\u4e2a\u5c3a\u5bf8\u6709\u4e9b\u5c0f\u4e86\uff0c\u751f\u6210\u7684PDF\u5185\u5bb9\u6a21\u7cca\uff0c\u9605\u8bfb\u4f53\u9a8c\u6781\u4e3a\u4e0d\u4f73\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u6709\u5fc5\u8981\u5bf9PDF\u5c3a\u5bf8\u8fdb\u884c\u81ea\u5b9a\u4e49\uff0c\u4e5f\u5c31\u662f\u8bbe\u7f6e\u5f97\u5927\u4e00\u4e9b\uff0c\u867d\u7136\u5927\u5c3a\u5bf8\u8ba9PDF\u6587\u4ef6\u5360\u636e\u7a7a\u95f4\u4e5f\u5927\u4e86\uff0c\u4f46\u73b0\u5728\u662f\u5927\u5c4f\u9ad8\u6e05\u65f6\u4ee3\uff0c\u6d41\u91cf\u4e0d\u503c\u94b1\uff0c\u6b64\u4e0d\u8db3\u4e0d\u503c\u4e00\u63d0\u3002<\/p>\n<p>\u5177\u4f53\u800c\u8a00\uff0c\u6211\u662f\u8fd9\u4e48\u5904\u7406\u7684\u3002<\/p>\n<p>\u9996\u5148\u786e\u5b9a\u597d\u9875\u9762\u4e2d\u5bb9\u5668\u5143\u7d20\u7684\u5bbd\u5ea6\uff0c\u5047\u8bbe\u662f700px\uff0c\u5219PDF\u7684\u5c3a\u5bf8\u53ef\u4ee5\u8bbe\u7f6e\u4e3a2\u500d\uff0c\u4e5f\u5c31\u662f1400px\uff0c\u800c\u7ad6\u7248PDF\u7684\u9ad8\u5bbd\u6bd4\u662f\u6839\u53f7\u4e8c\uff0c\u4e5f\u5c31\u662f1.414\uff0c\u6240\u4ee5PDF\u7684\u9ad8\u5ea6\u5c31\u662f1400*1.414=1979.6\u50cf\u7d20\u3002<\/p>\n<p>\u6b64\u65f6\uff0c\u518d\u914d\u5408\u7b80\u5355\u7684\u6570\u5b66\u8ba1\u7b97\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u5c06canvas\u56fe\u50cf\u5206\u9694\u6210\u4e00\u9875\u4e00\u9875\u7684\uff0c\u5206\u522b\u585e\u5728PDF\u4e2d\u3002<\/p>\n<p>\u5177\u4f53\u4ee3\u7801\u53c2\u89c1\u4e0b\u4e00\u8282\u5c01\u88c5\u7684\u4ee3\u7801\u793a\u610f\u3002<\/p>\n<h3>\u4e94\u3001\u5c01\u88c5\u540e\u7684\u7684\u65b9\u6cd5<\/h3>\n<p>\u4e3a\u4e86\u65b9\u4fbf\u9047\u5230\u7c7b\u4f3c\u9700\u6c42\u7684\u540c\u5b66\u53ef\u4ee5\u5feb\u901f\u5b8c\u6210\u5bf9\u5e94\u7684\u5f00\u53d1\u3002<\/p>\n<p>\u6211\u5c06\u4e0a\u9762\u7684\u56fe\u50cf\u5904\u7406\u548c\u5206\u9875\u5c01\u88c5\u6210\u4e86\u53ef\u590d\u7528\u7684\u65b9\u6cd5\uff0c\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff08\u652f\u6301jspdf\u548chtml2canvas src\u76f4\u8fde\u548c npm install \u5b89\u88c5\u4e24\u79cd\u4f7f\u7528\u5f62\u5f0f\uff09\uff1a<\/p>\n<pre>\/\/ \u5bfc\u51fa pdf \u5c01\u88c5\u65b9\u6cd5\r\n\/\/ by zhangxinxu(.com)\r\n\/\/ \u8bbf\u95ee https:\/\/www.zhangxinxu.com\/wordpress\/?p=10854 \u4e86\u89e3\u66f4\u65b0\u4fe1\u606f\r\nexport async function exportPdf (element, filename = '\u672a\u547d\u540d', callback = () =&gt; {}) {\r\n  if (!element) {\r\n    callback();\r\n    return;\r\n  }\r\n\r\n  \/\/ \u5c3a\u5bf8\u7684\u786e\u5b9a\r\n  const originWidth = element.offsetWidth || 700;\r\n\r\n  \/\/ \u521b\u5efa\u4e00\u4e2a\u5bb9\u5668\uff0c\u7528\u4e8e\u514b\u9686\u5143\u7d20\r\n  const container = document.createElement('div');\r\n  \/\/ 16px\u662f\u4e3a\u4e86\u751f\u6210\u7684PDF\u6709\u5b89\u5168\u8fb9\u8ddd\r\n  container.style.cssText = `position:fixed;left: ${-2 * originWidth}px; top:0;padding:16px;width:${originWidth}px;box-sizing:content-box;`;\r\n  \/\/ \u63d2\u5165\u5230body\u4e2d\r\n  document.body.appendChild(container);\r\n  \/\/ \u514b\u9686\u5143\u7d20\r\n  container.appendChild(element.cloneNode(true));\r\n\r\n  \/\/ \u4f9d\u8d56\u7684\u5e93\r\n  var jsPDF;\r\n\r\n  if (typeof html2canvas == 'undefined') {\r\n    html2canvas = await import('html2canvas').then(module =&gt; module.default);\r\n  }\r\n\r\n  if (typeof jspdf == 'undefined') {\r\n    jsPDF = await import('jspdf').then(module =&gt; module.jsPDF);\r\n  } else {\r\n    jsPDF = jspdf.jsPDF;\r\n  }\r\n\r\n  \/\/ \u4e3a\u4e86\u4fdd\u8bc1\u663e\u793a\u8d28\u91cf\uff0c2\u500dPDF\u5c3a\u5bf8\r\n  const scale = 2;\r\n  const width = originWidth + 32;\r\n\r\n  const PDF_WIDTH = width * scale;\r\n  const PDF_HEIGHT = width * 1.414 * scale;\r\n\r\n  \/\/ \u6e32\u67d3\u65b9\u6cd5\r\n  const render = function () {\r\n    \/\/ \u6e32\u67d3\u4e3a\u56fe\u7247\u5e76\u4e0b\u8f7d\r\n    html2canvas(container, {\r\n      scale: scale\r\n    }).then(function(canvas) {\r\n      const contentWidth = canvas.width;\r\n      const contentHeight = canvas.height;\r\n\r\n      \/\/ \u4e00\u9875pdf\u663e\u793ahtml\u9875\u9762\u751f\u6210\u7684canvas\u9ad8\u5ea6\r\n      const pageHeight = contentWidth \/ PDF_WIDTH * PDF_HEIGHT;\r\n\r\n      \/\/ canvas\u56fe\u50cf\u5728\u753b\u5e03\u4e0a\u7684\u5c3a\u5bf8\r\n      const imgWidth = PDF_WIDTH;\r\n      const imgHeight = PDF_WIDTH \/ contentWidth * contentHeight;\r\n\r\n      let leftHeight = contentHeight;\r\n      let position = 0;\r\n\r\n      const doc = new jsPDF('p', 'px', [PDF_WIDTH, PDF_HEIGHT]);\r\n\r\n      \/\/ \u4e0d\u8db3\u4e00\u9875\r\n      if (leftHeight &lt; pageHeight) {\r\n        doc.addImage(canvas, 'PNG', 0, 0, imgWidth, imgHeight);\r\n      } else {\r\n        \/\/ \u591a\u9875\r\n        while (leftHeight &gt; 0) {\r\n          doc.addImage(canvas, 'PNG', 0, position, imgWidth, imgHeight)\r\n          leftHeight -= pageHeight;\r\n          position -= PDF_HEIGHT;\r\n          \/\/\u907f\u514d\u6dfb\u52a0\u7a7a\u767d\u9875\r\n          if (leftHeight &gt; 0) {\r\n            doc.addPage();\r\n          }\r\n        }\r\n      }\r\n\r\n      doc.save(filename + '.pdf');\r\n\r\n      \/\/ \u79fb\u9664\u521b\u5efa\u7684\u5143\u7d20\r\n      container.remove();\r\n\r\n      \/\/ \u9690\u85cf\u5168\u5c40loading\u63d0\u793a\r\n      callback();\r\n    });\r\n  }\r\n\r\n  \/\/ \u56fe\u50cf\u5730\u5740\u66ff\u6362\u6210base64\u5730\u5740\r\n  const eleImgs = container.querySelectorAll('img');\r\n  const length = eleImgs.length;\r\n  let start = 0;\r\n  container.querySelectorAll('img').forEach(ele =&gt; {\r\n    let src = ele.src;\r\n\r\n    if (!src) {\r\n      return;\r\n    }\r\n\r\n    \/\/ \u4e8b\u4ef6\u5904\u7406\uff0c\u5fc5\u987b\u6210\u529f\u6216\u5931\u8d25\r\n    ele.onload = function () {\r\n      if (!\/^http\/.test(ele.src)) {\r\n        start++;\r\n        if (start == length) {\r\n          render();\r\n        }\r\n      }\r\n    };\r\n\r\n    \/\/ \u8bf7\u6c42\u56fe\u7247\u5e76\u8f6c\u4e3abase64\u5730\u5740\r\n    fetch(src).then(res =&gt; res.blob()).then(blob =&gt; {\r\n      var reader = new FileReader() ;\r\n      reader.onload = function () {\r\n        ele.src = this.result;\r\n      };\r\n      reader.readAsDataURL(blob) ;\r\n    }).catch(() =&gt; {\r\n      \/\/ \u8bf7\u6c42\u5f02\u5e38\u5904\u7406\r\n      start++;\r\n      if (start == length) {\r\n        render();\r\n      }\r\n    });\r\n  });\r\n}<\/pre>\n<p>\u53ef\u4ee5\u81ea\u52a8\u5c06\u5bb9\u5668\u5143\u7d20\u4e2d\u7684\u56fe\u7247Base64\uff0c\u540c\u65f6\u5185\u5bb9\u5206\u5e03\u5728\u6bcf\u4e00\u9875\u7684PDF\u4e0a\u5e76\u4e0b\u8f7d\u3002<\/p>\n<h4>\u5b9e\u8df5\u51fa\u771f\u77e5<\/h4>\n<p>\u4e3a\u4e86\u9a8c\u8bc1\u5c01\u88c5\u7684\u65b9\u6cd5\u7684\u6548\u679c\uff0c\u6211\u7279\u610f\u505a\u4e86\u4e2a\u6f14\u793a\u9875\u9762\u3002<\/p>\n<p><span class=\"s\">\/\/zxx: \u6f14\u793a\u9875\u9762\u91c7\u7528\u7684\u662f\u76f4\u8054\u8c03\u7528<\/span><\/p>\n<p>\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202306\/js-utils-jspdf-page-image-demo.php\" rel=\"noopener\" target=\"_blank\">exportPdf\u5c01\u88c5\u65b9\u6cd5\u4e0e\u8de8\u57df\u56fe\u7247PDF\u5bfc\u51fademo<\/a><\/p>\n<p>\u6253\u51fb\u53ef\u4ee5\u70b9\u51fb\u4e0b\u56fe\u6240\u793a\u7684\u201cPDF\u751f\u6210\u201d\u6309\u94ae\uff0c\u83ca\u82b1\u8f6c\u51e0\u5708\u4e4b\u540e\uff0c\u5c31\u53ef\u4ee5\u770b\u5230PDF\u4e0b\u8f7d\u7684\u63d0\u793a\u4e86\uff08\u770b\u4f60\u6d4f\u89c8\u5668\u8bbe\u7f6e\uff0c\u4e5f\u53ef\u80fd\u662f\u76f4\u63a5\u4fdd\u6301\u5230\u672c\u5730\uff09\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/2023-06-04_132204.png\" width=\"556\" height=\"266\" alt=\"\u5bfc\u51faPDF\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u4e0b\u56fe\u662f\u751f\u6210\u7684PDF\u6587\u4ef6\u7684\u7f29\u7565\u56fe\uff0c\u53ef\u4ee5\u770b\u5230\u56fe\u7247\u548c\u6392\u7248\u90fd\u662f\u5b8c\u5168\u7b26\u5408\u9884\u671f\u7684\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/2023-06-04_132414.png\" width=\"512\" height=\"258\" alt=\"\u5bfc\u51faPDF\u793a\u610f\u56fe\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u8c03\u7528\u8fd9\u5757\u7684JS\u4ee3\u7801\u53c2\u8003\uff1a<\/p>\n<pre>&lt;script src=\".\/html2canvas.min.js\"&gt;&lt;\/script&gt;\r\n&lt;script src=\".\/jspdf.umd.min.js\"&gt;&lt;\/script&gt;\r\n&lt;script type=\"module\"&gt;\r\nimport { exportPdf } from '.\/exportPdf.js';\r\n\/\/ \u70b9\u51fb\u6309\u94ae\u6267\u884cPDF\u5bfc\u51fa\r\nbutton.addEventListener('click', () =&gt; {\r\n    const article = document.querySelector('article');\r\n    \/\/ \u663e\u793aloading\r\n    button.loading = true;\r\n    \/\/ \u7531\u4e8e\u5bfc\u51faPDF\u662f\u5f02\u6b65\u7684\uff0c\u6240\u4ee5\u9700\u8981\u5728\u5bfc\u51fa\u5b8c\u6210\u540e\u9690\u85cfloading\r\n    exportPdf(article, '\u6700\u7ec8\u7ae0 \u6781\u5317\u5927\u8ff7\u5bab', () =&gt; {\r\n        button.loading = false;\r\n    });\r\n});\r\n&lt;\/script&gt;<\/pre>\n<p>\u5c11\u4e86\u5f88\u591a\u5904\u7406\u7ec6\u8282\uff0c\u662f\u4e0d\u662f\u5b9e\u73b0\u8d77\u6765\u7b80\u5355\u591a\u4e86\u3002<\/p>\n<h3>\u516d\u3001\u8de8\u884c\u5185\u8054\u80cc\u666f\u8272\u7684\u6e32\u67d3\u95ee\u9898<\/h3>\n<p>\u5b9e\u9645\u4f7f\u7528\u4e2d\uff0c\u8fd8\u9047\u5230\u4e86\u6bd4\u8f83\u68d8\u624b\u7684\u95ee\u9898\u3002<\/p>\n<p>\u5c31\u662f\u5185\u8054\u5143\u7d20\uff0c\u5982\u679c\u6709\u80cc\u666f\u8272\uff0c\u4e14\u8fd9\u4e2a\u80cc\u666f\u8272\u6362\u884c\u4e86\uff0c\u5219\u751f\u6210\u7684PDF\u7684\u8fd9\u90e8\u5206\u8272\u5757\u4f1a\u8986\u76d6\u90e8\u5206\u5185\u5bb9\uff0c\u5bfc\u81f4\u5f02\u5e38\u3002<\/p>\n<p>\u4f8b\u5982\u9875\u9762\u6e32\u67d3\u662f\u8fd9\u6837\u7684\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/2023-06-04_141556.png\" width=\"399\" height=\"185\" alt=\"\u539f\u59cb\u5e03\u5c40\u6548\u679c\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>PDF\u6548\u679c\u5374\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/2023-06-04_141755.png\" width=\"500\" height=\"293\" alt=\"\u5185\u8054\u8272\u5757bug\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u6211\u67e5\u4e86\u4e0bhtml2canvas\u7684issues\uff0c\u6709\u591a\u4e2a\u7c7b\u4f3c\u53cd\u9988\uff0c\u4f46\u662f\u90fd\u6ca1\u6709\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<p>\u6309\u7167\u6211\u5bf9html2canvas\u5e95\u5c42\u5b9e\u73b0\u65b9\u5f0f\u7684\u7406\u89e3\uff0c\u8fd9\u4e2a\u95ee\u9898\u786e\u5b9e\u4e0d\u592a\u597d\u5904\u7406\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u5e76\u4e0d\u8868\u793a\u6ca1\u6709\u65b9\u6cd5\u3002<\/p>\n<p>\u53ef\u4ee5\u5c06\u6574\u5757\u7684\u5185\u8054\u5143\u7d20\uff0c\u5206\u9694\u6210\u4e00\u4e2a\u4e00\u4e2a\u72ec\u7acb\u7684\u5185\u8054\u5143\u7d20\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u6b63\u5e38\u6e32\u67d3\u4e86\u3002<\/p>\n<p>\u4e5f\u5c31\u662f\u5c06\u8fd9\u4e2a\u7ed3\u6784\uff1a<\/p>\n<pre>&lt;span class=\"bgcolor\"&gt;CSS\u65b0\u4e16\u754c&lt;\/span&gt;<\/pre>\n<p>\u8f6c\u6362\u6210\u8fd9\u6837\u5b50\u7684\uff08\u5b9e\u9645\u5f00\u53d1\u4e0d\u80fd\u6362\u884c\uff0c\u8fd9\u91cc\u662f\u4e3a\u4e86\u65b9\u4fbf\u5927\u5bb6\u9605\u8bfb\u523b\u610f\u5904\u7406\u7684\uff09\uff1a<\/p>\n<pre>&lt;span&gt;\r\n    &lt;span class=\"bgcolor\"&gt;C&lt;\/span&gt;\r\n    &lt;span class=\"bgcolor\"&gt;S&lt;\/span&gt;\r\n    &lt;span class=\"bgcolor\"&gt;S&lt;\/span&gt;\r\n    &lt;span class=\"bgcolor\"&gt;\u65b0&lt;\/span&gt;\r\n    &lt;span class=\"bgcolor\"&gt;\u4e16&lt;\/span&gt;\r\n    &lt;span class=\"bgcolor\"&gt;\u5c4a&lt;\/span&gt;\r\n&lt;\/span&gt;<\/pre>\n<p>\u6765\u770b\u4e0b\u6700\u7ec8\u7684\u6548\u679c\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202306\/html2canvas-inline-span-crossline-bug-demo.php\" rel=\"noopener\" target=\"_blank\">\u89e3\u51b3html2canvas span inline background\u8272\u5757\u95ee\u9898demo<\/a><\/p>\n<p>\u70b9\u51fb\u4e0b\u9762\u8fd9\u4e2a\u6309\u94ae\uff0cJS\u4f1a\u5bf9\u539f\u6765\u7684DOM\u7ed3\u6784\u8fdb\u884c\u5904\u7406\uff08\u5b9e\u9645\u5f00\u53d1\u53ef\u4ee5\u514b\u9686\u8be5\u5143\u7d20\u518d\u5904\u7406\uff0c\u4ee5\u907f\u514dDOM\u7ed3\u6784\u53d8\u5316\u4f1a\u5e26\u6765\u6f5c\u5728\u98ce\u9669\uff09\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/2023-06-04_142839.png\" width=\"505\" height=\"372\" alt=\"\u4fee\u590d\u6309\u94ae\u70b9\u51fb\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u6b64\u65f6\uff0c\u751f\u6210\u7684PDF\u6548\u679c\u5c31\u548c\u539f\u59cb\u5e03\u5c40\u6837\u5f0f\u6548\u679c\u4fdd\u6301\u4e00\u81f4\u4e86\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/2023-06-04_143022.png\" width=\"501\" height=\"280\" alt=\"\u751f\u6210\u6548\u679c\u4fdd\u6301\u4e00\u81f4\u4e86\" class=\"alignnone size-medium\" \/><\/p>\n<h3>\u4e03\u3001\u5176\u4ed6\u70b9\u70b9\u70b9<\/h3>\n<p>\u672c\u6587\u793a\u610f\u9875\u9762\u6240\u4f7f\u7528\u7684JS\u6587\u4ef6\u90fd\u662fscript\u76f4\u8fde\u3002<\/p>\n<p>\u5b9e\u9645\u5f00\u53d1\uff0c\u591a\u662f\u8d70\u524d\u7aef\u6846\u67b6\u3002<\/p>\n<p>\u7531\u4e8e\u8fd9\u4e24\u4e2aJS\u90fd\u662f\u4f53\u79ef\u6bd4\u8f83\u5927\u7684JS\uff0c\u56e0\u6b64\uff0c\u53ef\u4ee5\u4f7f\u7528<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2018\/08\/browser-native-es6-export-import-module\/\">\u52a8\u6001\u52a0\u8f7d<\/a>\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u3002<\/p>\n<pre>import('html2canvas').then(module => module.default).then(...)\r\nimport('jspdf').then(module => module.jsPDF).then(...)<\/pre>\n<h4>\u76fc\u661f\u661f\u76fc\u6708\u4eae<\/h4>\n<p>\u300aCSS\u9009\u62e9\u5668\u4e16\u754c \u7b2c2\u7248\u300b\u7684\u7b7e\u5b57\u7248\u4e5f\u5df2\u7ecf\u53ef\u4ee5\u8d2d\u4e70\u5566\uff0c\u6253\u5f00\u624b\u673a\u6dd8\u5b9d\uff0c\u626b\u4e0b\u56fe\u5de6\u4e0b\u89d2\u7684\u7801\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/book-taobao-qrcode.png\" width=\"698\" height=\"335\" alt=\"\u4e66\u7c4d\u8d2d\u4e70\u7801\" class=\"alignnone size-medium\" \/><\/p>\n<p><span class=\"s\">\/\/zxx: \u5305\u90ae\uff0c\u53e6\u5916\uff0c\u6211\u8fd9\u91cc\u8fd8\u6709\u4e09\u5f20\u6781\u5ba2\u65f6\u95f414\u5929\u7545\u5b66\u5361\uff0c\u5148\u8d2d\u4e70\u7684\u4f18\u5148\u8d60\u9001\u4e4b\u3002<\/span><\/p>\n<p>OK\uff0c\u5176\u4ed6\u5c31\u6ca1\u4ec0\u4e48\u597d\u8bf4\u7684\uff0c\u5e0c\u671b\u672c\u6587\u7684\u5185\u5bb9\u53ef\u4ee5\u5e2e\u5230\u9047\u5230\u7c7b\u4f3c\u9700\u6c42\u7684\u5c0f\u4f19\u4f34\u3002<\/p>\n<p>\u2764\ufe0f ? ? ? ? ? <\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u6b22\u8fce\u5206\u4eab\uff0c\u52ff\u5168\u6587\u8f6c\u8f7d\uff0c\u5982\u679c\u5b9e\u5728\u559c\u6b22\uff0c\u53ef\u6536\u85cf\uff0c\u6c38\u4e0d\u8fc7\u671f\uff0c\u4e14\u4f1a\u53ca\u65f6\u66f4\u65b0\u77e5\u8bc6\u70b9\u53ca\u4fee\u6b63\u9519\u8bef\uff0c\u9605\u8bfb\u4f53\u9a8c\u4e5f\u66f4\u597d\u3002<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=10854\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=10854<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202306\/pdf-cover.png\" width=\"160\" height=\"98\" alt=\"PDF\u5c01\u9762\u56fe\" class=\"alignright size-medium\" loading=\"lazy\" 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