之前使用 html2canvas 和 jsPDF 实现html转pdf，但是客户说不能复制pdf中的文字，要改一下，先说不能复制的方法，再说可以复制的方法

一，html2canvas 和 jsPDF（图片插入pdf不可复制）

创建pdf.js文件，代码如下

import html2canvas from 'html2canvas'
import jsPDF from 'jspdf'
import Vue from 'vue'
export const downloadPDF = (page, ne, isDownload) => {html2canvas(page, {allowTaint: true,taintTest: false,useCORS: true,// width:960,// height:5072,dpi: window.devicePixelRatio * 8, // 将分辨率提高到特定的DPI 提高四倍scale: 10 // 按比例增加分辨率}).then(function(canvas) {canvas2PDF(canvas, ne, isDownload)})
}
const canvas2PDF = (canvas, ne, isDownload) => {var contentWidth = canvas.widthvar contentHeight = canvas.height// 一页pdf显示html页面生成的canvas高度;var pageHeight = (contentWidth / 592.28) * 841.89// 未生成pdf的html页面高度var leftHeight = contentHeight// 页面偏移var position = 0// a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高var imgWidth = 595.28var imgHeight = (592.28 / contentWidth) * contentHeightvar pageData = canvas.toDataURL('image/jpeg', 1.0)var PDF = new jsPDF('', 'pt', 'a4')if (leftHeight < pageHeight) {PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)} else {while (leftHeight > 0) {PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)leftHeight -= pageHeightposition -= 841.89if (leftHeight > 0) {// PDF.addPage();}}}console.log('PDF', PDF)if (isDownload) {PDF.save(ne + '.pdf') // 这里是导出的文件名} else {var pdfData = PDF.output('datauristring')Vue.prototype.$baseURL = pdfData// sessionStorage.setItem('base64URL',pdfData);console.log(1)}
}

 使用

      <div class="pdf"><div ref="pdf" class="page">你好</div></div>//引入
import { downloadPDF, canvas2PDF } from '../../utils/pdf' // 工具方法，导出操作handleExport() {  var zhis = thisvar dsq = setTimeout(() => {downloadPDF(this.$refs.pdf, `CUKH Tax Invoice - ${this.form.invoiceNo}`, true)}, 100)
}

 一，window.print();方法打印（可复制）

1，安装

npm install vue-print-nb --save

2，手动下载插件到本地 

插件地址：https://github.com/xyl66/vuePlugs_printjs
在src下新建文件夹plugs,将下载好的print.js放入plugs文件夹下

 printjs代码

//print.js 里的代码
// 打印类属性、方法定义
/* eslint-disable */
const Print =function(dom, options) {if (!(this instanceof Print)) return new Print(dom, options);this.options = this.extend({'noPrint': '.no-print'}, options);if ((typeof dom) === "string") {this.dom = document.querySelector(dom);} else {this.dom = dom;}this.init();};Print.prototype = {init: function () {var content = this.getStyle() + this.getHtml();this.writeIframe(content);},extend: function (obj, obj2) {for (var k in obj2) {obj[k] = obj2[k];}return obj;},getStyle: function () {var str = "",styles = document.querySelectorAll('style,link');for (var i = 0; i < styles.length; i++) {str += styles[i].outerHTML;}str += "<style>" + (this.options.noPrint ? this.options.noPrint : '.no-print') + "{display:none;}</style>";return str;},getHtml: function () {var inputs = document.querySelectorAll('input');var textareas = document.querySelectorAll('textarea');var selects = document.querySelectorAll('select');for (var k in inputs) {if (inputs[k].type == "checkbox" || inputs[k].type == "radio") {if (inputs[k].checked == true) {inputs[k].setAttribute('checked', "checked")} else {inputs[k].removeAttribute('checked')}} else if (inputs[k].type == "text") {inputs[k].setAttribute('value', inputs[k].value)}}for (var k2 in textareas) {if (textareas[k2].type == 'textarea') {textareas[k2].innerHTML = textareas[k2].value}}for (var k3 in selects) {if (selects[k3].type == 'select-one') {var child = selects[k3].children;for (var i in child) {if (child[i].tagName == 'OPTION') {if (child[i].selected == true) {child[i].setAttribute('selected', "selected")} else {child[i].removeAttribute('selected')}}}}}return this.dom.outerHTML;},writeIframe: function (content) {var w, doc, iframe = document.createElement('iframe'),f = document.body.appendChild(iframe);iframe.id = "myIframe";iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";w = f.contentWindow || f.contentDocument;doc = f.contentDocument || f.contentWindow.document;doc.open();doc.write(content);doc.close();this.toPrint(w);setTimeout(function () {document.body.removeChild(iframe)}, 100)},toPrint: function (frameWindow) {try {setTimeout(function () {frameWindow.focus();try {if (!frameWindow.document.execCommand('print', false, null)) {frameWindow.print();}} catch (e) {frameWindow.print();}frameWindow.close();}, 10);} catch (err) {console.log('err', err);}}};const MyPlugin = {}MyPlugin.install = function (Vue, options) {Vue.prototype.$print = Print}export default MyPlugin

 main.js里引入

import Print from './plugs/print'
Vue.use(Print)

使用

      <div class="pdf"><div ref="pdf" class="page">你好</div></div>handleExport() {setTimeout(() => {this.$print(this.$refs.pdf)}, 100);},

 修改打印样式

 样式可能会有偏差，或者位移可以添加样式去修改

@media print {@page {margin: 0 !important;}.pdf{position: fixed;top: -265px !important;left: -150px !important;transform: translate(-50%, -50%);transform: scale(0.7);box-shadow:none !important;}}

可能遇到的问题及解决方案

①图片占位置 ---------让它脱离文档流（ position: absolute; 不要用fixed 这样内容多的时候只打印第一页）
②页面不想展示打印内容 只打印；------- 给它 z-index：-1 （display：none 的话打印内容也没有）

③

指定不打印区域

方法1. 添加no-print样式类

方法2. 自定义类名
this.print( this.print(this.print(this.refs.print,{‘no-print’:‘.do-not-print-me-xxx’})