前言：临时性需求没怎么接触过前端，代码实现有问题及优化点希望大佬可以留言告知一下
开发工具：VS CODE
界面开发：Vue3+TypeScript+ElementPlus
打印组件：Print-JS
前端打印入口图：
标签页面：
打印界面：
实现功能：前端点击"打印标签"弹出打印界面进行打印作业
实现过程：主界面点击"打印标签"调用el-dialog弹窗(预览和直接打印都居于弹窗实现)
标签模板代码：
<template> <div class="LabelPrint-List"> <el-dialog v-model="state.isShowDialog" draggable :close-on-click-modal="false" width="50%" > <template #header><div style="color: #fff"><el-icon size="16" style="margin-right: 3px; display: inline; vertical-align: middle"> <ele-Edit/> </el-icon><span>标签打印界面</span></div></template> <el-row :gutter="10"> <el-col :xs="24" :sm="24" :md="24" :lg="24" :xl="24" class="mb10"> <div v-for="item in state.Datas"> <el-card class="box-card" style="width:100mm; height: 90mm;display: block;" > <div :id='item.id?.toString()'> <!-- print-js --> <div class="labelHeadBody"> <div class="labelHeadBodyLeftHead"> <img class="labelHeadBodyLeftHeadimage" src="/image/点金log.png" fit="fill" /> </div> <div class="labelHeadBodyRightHead"> <table class="tableHead"> <tr> <td class="labelHeadBodyRightHeadTd">某某有限公司</td> </tr> <tr> <td class="labelHeadBodyRightHeadTd">物料标识卡</td> </tr> </table> </div> </div> <div class="labelBody"> <table> <tbody> <tr><td class="lableBodytdleft">P/N：</td><td class="lableBodytdright">{{ item.produceNo }}</td></tr> <tr><td class="lableBodytdleft">数量：</td><td class="lableBodytdright">{{ item.quantity }}</td></tr> <tr><td class="lableBodytdleft">规格：</td><td class="lableBodytdright lableBodytdrightfont">{{ item.platingSpecs }}</td></tr> <tr><td class="lableBodytdleft">供应商：</td><td class="lableBodytdright">东莞点金</td></tr> <tr><td class="lableBodytdleft">生产日期：</td><td class="lableBodytdright">{{moment(String(item.createTime)).format('YYYY/MM/DD')}}</td></tr> <tr><td class="lableBodytdleft">批次单号：</td><td class="lableBodytdright">{{ item.lot }}</td></tr> <tr><td class="lableBodytdleft">单重：</td><td class="lableBodytdright">{{ item.singleWeight }}</td></tr> <tr><td class="lableBodytdleft">总重：</td><td class="lableBodytdright">{{ item.sumWeight }}</td></tr> <tr><td class="lableBodytdleft">标识人：</td><td class="lableBodytdright"></td></tr> </tbody> </table> </div> </div> </el-card> </div> </el-col> </el-row> <template #footer><span class="dialog-footer"><el-button @click="cancel">取 消</el-button> <el-button style="background-color:red;color:white" @click="print">打 印</el-button></span></template> </el-dialog> </div></template>Typescript代码：
printrow 方法中使用nextTick是当el-dialog弹窗DOM加载完成后在调用PrintJS获取需要打印的区域，这个直接打印过程其实会先弹窗然后DOM加载完成后直接调用浏览器打印界面，后面把弹出关闭，如果不加载el-dialog可以通过动态加载html内容来实现直接打印，我这里图方便就用该方法实现了。
printJS({printable:区域id,type:打印类型(pdf\image\html等),style:打印内容的CSS样式})
注意：style参数值按打印区域的HTMLCSS样式构建，调用printJS设置scanStyles:false不会自动加载HTML的CSS样式需要重新给Style参数赋值所以增加了一个printStyle函数，scanStyles默认值是true(会导致打印界面的内容奇奇怪怪，还没去了解详细原因哈哈哈哈)
<script lang="ts" setup>import { ref,reactive,nextTick } from 'vue';import { TbProduceOrderNoInfo } from '/@/api-services';import printJS from 'print-js';import moment from 'moment';const props=defineProps({ title:String})const state=reactive({ isShowDialog:false, Datas:[] as Array<TbProduceOrderNoInfo>,})const emits = defineEmits(['handleQuery']);const closeDialog=()=>{ emits('handleQuery'); state.isShowDialog=false;}const cancel=()=>{ state.isShowDialog=false; closeDialog();}//预览+打印const openDialog=async(row:any)=>{ state.Datas=JSON.parse(JSON.stringify(row)); state.isShowDialog=true;}const print=()=>{ for(var i=0;i<state.Datas.length;i++){ printJS({printable:`${state.Datas[i].id}`,type:"html",style:printStyle(),scanStyles:false}) }}//直接打印不预览const printrow=async(row:any)=>{ state.Datas=JSON.parse(JSON.stringify(row)); state.isShowDialog=true; //主界面form DOM加载完成 nextTick(()=>{ //弹窗加载完成 nextTick(()=>{ printJS({printable:`${state.Datas[0].id}`,type:"html",style:printStyle(),scanStyles:false}) state.isShowDialog=false; }) })}//打印界面的CSS样式const printStyle=()=>{ return `.labelHeadBody{ display: flex;justify-content:space-between;margin: 0; font-size: 16px;width: 100%; height:45px}.labelHeadBodyLeftHead{ width: 30px;}.labelHeadBodyRightHead{ width: 250px; height: 70px;display: flex;justify-content: center;}.lableBodytdrightfont{ font-size:10px}.labelHeadBodyRightHeadTd{ padding: 0; font-size: 14px; font-weight: bold; text-align: center; vertical-align: middle;}.labelBody{ margin-left: 5px; margin-right: 5px;}.lableBodytdleft{ width: 30%; font-weight: bold; vertical-align: bottom; }.lableBodytdright{ width: 70%; border-bottom: 1px solid;}.labelHeadBodyLeftHeadimage{ width: 70px; height: 40px}.tableHead{ height: 20px;} `;}//预览、直接打印defineExpose({openDialog,printrow})</script>标签前端样式代码：
<style>.labelHeadBody{ display: flex;justify-content:space-between;margin: 0; font-size: 16px;width: 100%;}.labelHeadBodyLeftHead{ width: 30px;}.labelHeadBodyRightHead{ width: 250px; height: 70px;display: flex;justify-content: center;}.labelHeadBodyRightHeadTd{ padding: 0; font-size: 14px; font-weight: bold; text-align: center; vertical-align: middle;}.labelBody{ margin-top: 10px; margin-left: 5px; margin-right: 5px;}.lableBodytdleft{ width: 30%; font-weight: bold; vertical-align: bottom; }.lableBodytdright{ width: 75%; border-bottom: 1px solid;}.labelHeadBodyLeftHeadimage{ width: 80px; height: 55px}.tableHead{ height: 20px;}</style>最后，如果需要带二维码的同学可以添加qrcode组件，以下是简单的实现（el-image、img标签中图片不显示的问题还没解决，迂回操作直接把生成的二维码图片设置成控件背景来处理，囧.........）：
<template #default="scope"> <div :style="createQrcode(scope.row.eqNo)" ></div> <!-- <el-image :scr="createQrcode1(scope.row.eqNo)" style="width: 60px;height: 60px;"></el-image> --></template>import QRCode from 'qrcode'//将生成的二维码设置成div的Style，不知道为嘛el-image绑定base64image图片不显示const createQrcode=(text:string)=>{ if(text==""||text==undefined||text==null) return ""; let url1:any; url1=""; QRCode.toDataURL(text,(err,url)=>{ if(err){ console.error(err); } else{ url1=url; } }) return `background-image: url(${url1});background-position: center center;background-size: contain;background-repeat: no-repeat;;width:100%;height:60px`;}