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blob
export 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.class="lazy" data-src上
  return blob;
};

 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);
  })
}

<div id="printDiv"></div>

<template>
  <a-modal
    v-model="visible"
    :title="title"
    :maskClosable="false"
    centered
    :width="1000"
    @cancel="close"
  >
    <div id="printDiv">
      <div v-if="!pdfing">
        <span></span>
        <span>入库单</span>
        <a @click="printChart">打印报表</a>
      </div>
      <div class="maintain-view-title pdfing" v-else>
        <span>入库单</span>
      </div>
      <a-form :colon="true" :label-col="{ span: 8 }" :wrapper-col="{ span: 15 }">
        <a-row>
          <a-col :span="8">
            <a-form-item label="入库单号">
              <span>{{ viewInfo.accessNumber }}</span>
            </a-form-item>
          </a-col>
          <a-col :span="8">
            <a-form-item label="供应商">
              <span>{{ viewInfo.supplier }}</span>
            </a-form-item>
          </a-col>
          <a-col :span="8">
            <a-form-item label="入库日期">
              <span>{{ viewInfo.accessDate && $moment(viewInfo.accessDate).format('YYYY-MM-DD HH:mm:ss') }}</span>
            </a-form-item>
          </a-col>
        </a-row>
        <a-row>
          <a-col :span="8">
            <a-form-item label="仓库">
              <span>{{ viewInfo.warehouse }}</span>
            </a-form-item>
          </a-col>
          <a-col :span="8">
            <a-form-item label="来源">
              <span>{{ viewInfo.source }}</span>
            </a-form-item>
          </a-col>
          <a-col :span="8">
            <a-form-item label="经办人">
              <span>{{ viewInfo.handledBy }}</span>
            </a-form-item>
          </a-col>
        </a-row>
        <a-row>
          <a-col :span="8">
            <a-form-item label="采购单号">
              <span>{{ viewInfo.purchaseOrderNo }}</span>
            </a-form-item>
          </a-col>
          <a-col :span="8">
            <a-form-item label="发票号">
              <span>{{ viewInfo.invoiceNo }}</span>
            </a-form-item>
          </a-col>
          <a-col :span="8">
            <a-form-item label="合同号">
              <span>{{ viewInfo.contractNo }}</span>
            </a-form-item>
          </a-col>
        </a-row>
        <a-row>
          <a-col :span="8">
            <a-form-item label="入库类型">
              <span>{{ viewInfo.accessType }}</span>
            </a-form-item>
          </a-col>
          <a-col :span="8">
            <a-form-item label="创建时间">
              <span>{{ viewInfo.addTime }}</span>
            </a-form-item>
          </a-col>
          <a-col :span="8">
            <a-form-item label="备注">
              <span>{{ viewInfo.content }}</span>
            </a-form-item>
          </a-col>
        </a-row>
      </a-form>
      <a-table
        style="marginTop: 10px;"
       
        :columns="columns"
        :data-source="data"
        :pagination="false"
        :loading="loading"
        row-key="id"
      >
      </a-table>
    </div>
    <template slot="footer">
      <a-button key="back" type="primary" @click="close">取消</a-button>
    </template>
  </a-modal>
</template>
<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);
    },
    
    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>
<style scoped>
.maintain-view-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  &.pdfing {
    justify-content: center;
  }
  .maintain-view-title-label {
    font-weight: bold;
    font-size: 1.5em;
  }
}
.container-title-block {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
}
.viewForm {
  /deep/.ant-form-item {
    margin-bottom: 0;
  }
}
</style>