1.print.js

// 打印类属性、方法定义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.isDOM(dom) this.dom = this.isDOM(dom) ? dom : dom.$el; } 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>"; str += "<style>html,body,div,#preview-main,.report{width:100%!important;height: auto!important;font-size:14px}</style>"; return str; }, getHtml: function () { var inputs = document.querySelectorAll('input'); var textareas = document.querySelectorAll('textarea'); var selects = document.querySelectorAll('select'); var canvass = document.querySelectorAll('canvas'); for (var k = 0; k < inputs.length; k++) { 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) } else { inputs[k].setAttribute('value', inputs[k].value) } } for (var k2 = 0; k2 < textareas.length; k2++) { if (textareas[k2].type == 'textarea') { textareas[k2].innerHTML = textareas[k2].value } } for (var k3 = 0; k3 < selects.length; k3++) { 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') } } } } } //canvass echars图表转为图片 for (var k4 = 0; k4 < canvass.length; k4++) { var imageURL = canvass[k4].toDataURL("image/png"); var img = document.createElement("img"); img.src = imageURL; img.setAttribute('style', 'max-width: 100%;'); img.className = 'isNeedRemove' // canvass[k4].style.display = 'none' // canvass[k4].parentNode.style.width = '100%' // canvass[k4].parentNode.style.textAlign = 'center' canvass[k4].parentNode.insertBefore(img,canvass[k4].nextElementSibling); } 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;"; iframe.setAttribute('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(); // 避免重复打印echarts var removes = document.querySelectorAll('.isNeedRemove'); for (var k = 0; k < removes.length; k++) { removes[k].parentNode.removeChild(removes[k]); } var _this = this iframe.onload = function(){ _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); } }, isDOM: (typeof HTMLElement === 'object') ? function (obj) { return obj instanceof HTMLElement; } : function (obj) { return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string'; }};const MyPlugin = {}MyPlugin.install = function (Vue, options) { // 4. 添加实例方法 Vue.prototype.$print = Print}export default MyPlugin

自己页面的样式添加

str += "<style>html,body,div,#preview-main,.report{width:100%!important;height: auto!important;font-size:14px}</style>";

解决echarts图表多点击一次 就会多一张bug

img.className = 'isNeedRemove'canvass[k4].parentNode.insertBefore(img,canvass[k4].nextElementSibling);var removes = document.querySelectorAll('.isNeedRemove');

2.用法

//调用系统打印机print () { this.$print(this.$refs.print) // 使用},

题外话

1.在自己需要的页面引用打印页面 这边我打印页面时preview.vue页面

<!-- 预览 --><Modal v-model="previewModal" fullscreen :mask-closable="false" :closable="false"> <preview ref="print" :previewEditOldForm="previewEditForm"></preview> <div slot="footer" class="btn"> <Button type="text" @click="closePreview">关闭</Button> <Button type="primary" @click="print">打印</Button> </div></Modal> import Preview from '../operation_report/Preview'export default { components: { Preview }}

获取别的页面的表单内容 初始化

export default { data() { return{ previewEditForm: {}, } }}// 父组件向子组件传值 on: { click: () => { // 父组件向子组件传值 this.previewEditForm = params.row; setTimeout(() => { this.$refs.print.queryById(); this.$refs.print.eventOverviews(); this.previewModal=true; }, 2000) } }

隐藏打印页面不需要的按钮

<style scoped> @media print { .btn{ display: none; } }</style>

4.打印内容有echarts时 内容不自适应 调整width

width: 210mm;

最终如下

补充知识：使用vue-cli脚手架 与 axios 请求数据 配置代理进行跨域访问数据问题

首先利用脚手架vue-cli 把项目搭建好 然后在 利用控制台 在项目中安装http-proxy-middleware中间件作为代理

控制台安装中间代理命令 如下：

npm install -S http-proxy-middleware

然后按照下图 一步步配置

配置结束 是不是 还是不行？

在这里 要关闭下项目 重新在控制台 npm run dev 重启项

目 就大功告成了

一点心得 体会 写得不好 还请大家多多包涵

以上这篇vue 中使用print.js导出pdf操作就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。