焦点关注：react打印样式丢失怎么办

npm install --save html2canvas

npm install jspdf --save

import html2canvas from "html2canvas";import jsPDF from "jspdf";// base64转blobexport function toBlob(base64Data) {  let byteString = base64Data  if (base64Data.split(",")[0].indexOf("base64") >= 0) {    byteString = atob(base64Data.split(",")[1]); // base64 解码  } else {    byteString = unescape(base64Data.split(",")[1]);  }  // 获取文件类型  const mimeString = base64Data.split(";")[0].split(":")[1]; // mime类型  // ArrayBuffer 对象用来表示通用的、固定长度的原始二进制数据缓冲区  // let arrayBuffer = new ArrayBuffer(byteString.length) // 创建缓冲数组  // let uintArr = new Uint8Array(arrayBuffer) // 创建视图  const uintArr = new Uint8Array(byteString.length); // 创建视图  for (let i = 0; i < byteString.length; i += 1) {    uintArr[i] = byteString.charCodeAt(i);  }  // 生成blob  const blob = new Blob([uintArr], {    type: mimeString  })  // 使用 Blob 创建一个指向类型化数组的URL, URL.createObjectURL是new Blob文件的方法,可以生成一个普通的url,可以直接使用,比如用在img.src上  return blob;};/** * 输出pdf * @param {*} idName  html元素 * @param {*} pdfName  输出pdf文件名 * @param {*} isDownload  是否直接下载 * @param {*} isPrint 是否直接打印 * @param {*} callback  执行后的回调   */ export function outPutPdf(idName, pdfName, isDownload = false, isPrint = false, callback) {  const element = document.getElementById(idName);  // 这个dom元素是要导出的pdf的div容器  const w = element.offsetWidth;  // 获得该容器的宽  const h = element.offsetHeight;  // 获得该容器的高  const offsetTop = element.offsetTop; // 获得该容器到文档顶部的距离    const offsetLeft = element.offsetLeft; // 获得该容器到文档最左的距离  const canvas = document.createElement("canvas");  let abs = 0;  const winI = document.body.clientWidth; // 获得当前可视窗口的宽度（不包含滚动条）  const winO = window.innerWidth; // 获得当前窗口的宽度（包含滚动条）  if (winO > winI) {    abs = (winO - winI) / 2; // 获得滚动条宽度的一半  }  canvas.width = w * 2; // 将画布宽&&高放大两倍  canvas.height = h * 2;  const context = canvas.getContext("2d");  context.scale(2, 2);  context.translate(-offsetLeft - abs, -offsetTop);  // 这里默认横向没有滚动条的情况，因为offset.left()，有无滚动条的时候存在差值，因此translate的时候，要把这个差值去掉  html2canvas(element, {    useCORS: true, // 允许加载跨域的图片    allowTaint: true,    scale: 2 // 提升画面质量，但是会增加文件大小  }).then(cs => {    const contentWidth = cs.width;    const contentHeight = cs.height;    // 一页pdf显示html页面生成的canvas高度    const pageHeight = contentWidth / 592.28 * 841.89;    // 未生成pdf的html页面高度    let leftHeight = contentHeight;    // 页面偏移    let 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    const imgWidth = 595.28;    const imgHeight = 592.28 / contentWidth * contentHeight;    const pageDate = cs.toDataURL("image/jpeg", 1.0);    const pdf = new jsPDF("", "pt", "a4");    // 有两个高度需要区分，一个是html页面的实际高度，和生成pdf的页面的高度（841.89）    // 当内容未超过pdf一页显示的范围，无需分页    if (leftHeight < pageHeight) {      pdf.addImage(pageDate, "JPEG", 0, position, imgWidth, imgHeight);    } else { // 分页      while (leftHeight > 0) {        pdf.addImage(pageDate, "JPEG", 0, position, imgWidth, imgHeight)        leftHeight -= pageHeight;        position -= 841.89;        // 避免添加空白页        if (leftHeight > 0) {          pdf.addPage()        }      }    }    if (isDownload) {      pdf.save(`${pdfName}.pdf`);    }     if (isPrint) {      const link = window.URL.createObjectURL(toBlob(pdf.output("datauristring")));            const myWindow = window.open(link);      myWindow.print();    }    callback && callback(pdf);  })}

<script>import { outPutPdf } from "@/utils/util";import { getStorageOrderTopDetail, getStorageOrderBottomListNoPage } from "@/api/stock";export default {  name: "StockStorageOrderViewModal",  components: {},  data() {    return {      visible: false,      form: null,      title: "出库确认",      loading: false,      viewInfo: {},      columns: [        {          title: "序号",          key: "index",          customRender: (text, render, index) => {            return index + 1          },          align: "center"        },        {          title: "产品编号",          key: "productNumber",          dataIndex: "productNumber"        },        {          title: "类别",          key: "type",          dataIndex: "type"        },        {          title: "产品名称",          key: "productName",          dataIndex: "productName"        },        {          title: "规格型号",          dataIndex: "specifications",          dataIndex: "specifications"        },        {          title: "计量单位",          key: "unit",          dataIndex: "unit"        },        {          title: "批次",          key: "batch",          dataIndex: "batch"        },        {          title: "数量",          key: "number",          dataIndex: "number"        },        {          title: "单价",          key: "price",          dataIndex: "price"        },        {          title: "金额",          key: "total",          dataIndex: "total"        },        {          title: "已入库",          key: "inbound",          dataIndex: "inbound"        },        {          title: "未入库",          key: "notInbound",          dataIndex: "notInbound"        }      ],      data: [],      pdfing: false, // 打印中    };  },  methods: {    // 显示弹框    show(id) {      this.visible = true;      // 获取上方数据      getStorageOrderTopDetail({ id }).then(res => {        if (res.code === 0) {          this.viewInfo = res.data;        }      });      // 获取下方表格数据      this.getTableData(id);    },    /**     * 关闭弹框     */    close() {      this.visible = false;      this.$emit("cancel");    },    // 获取表格数据    getTableData(warehouseRegisterId) {       const params = {        warehouseRegisterId      };      getStorageOrderBottomListNoPage(params).then(res => {        this.loading = false;        if (res.code === 0) {          this.data = res.data;        } else {          this.$common.showErrorMessage(res.msg || "请求出现错误，请稍后再试");        }      });    },    // 打印    printChart() {      this.pdfing = true;      this.$nextTick(() => {        outPutPdf("printDiv", "入库单", false, true, () => {          this.pdfing = false;        });      });    }  }};</script>