js实现打印 print.js

如果单纯实现打印整个窗口, window.print() 就能实现,但是我们往往要打印一个区域或者说一个div块
由于print打印的是整个窗体,所以我们要把打印区域变成窗体,所以我们需要一个库,来实现这些事

下面介绍 2种 方式使用print.js库实现打印

第一种: （可加上样式）

安装

npm install print-js --save

引入

import print from 'print-js'

使用

–html部分

<div><p>test printp><div class="print-div" id="print_area"><p class="red">世上本没有路，走的人多了，便有了路 ---- 鲁迅p><p class="green">世上本没有路，走的人多了，便有了路 ---- 鲁迅p><p>世上本没有路，走的人多了，便有了路 ---- 鲁迅p><p>世上本没有路，走的人多了，便有了路 ---- 鲁迅p>div><button @click="printSomething">打印button>
div>

–js部分

printSomething(){// 此处的style即为打印时的样式const style = '@page {  } ' +'@media print { .print-div{ padding:8px;background-color:#cccccc;line-height:12px } .red{ color:#f00} .green{color:green}' ;print({printable: 'print_area',type: 'html',style: style,// 亦可使用引入的外部css;scanStyles: false})
}

第二种: (本地print.js的CDN,在vue中引用的例子)

引入 (vue项目的main.js中)

import Print from '@/utils/print.js'Vue.use(Print)

使用

–html部分

<section ref="print" class="recordImg" id="printRecord"><img :src="image" alt="">
</section>
<span slot="footer" class="dialog-footer"><el-button @click="recordVisible = false">取 消</el-button><el-button type="primary" @click="PrintRow">打 印</el-button>
</span>

–js部分

//打印
PrintRow(index, row){this.$print(this.$refs.print) // 使用
},

print.js源码

// 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.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 += "";return str;},getHtml: function () {var inputs = document.querySelectorAll('input');var textareas = document.querySelectorAll('textarea');var selects = document.querySelectorAll('select');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')}}}}}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();var _this = thisiframe.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

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