vue 渲染pdf

import pdf from "vue-pdf-signature";，这里不引入vue-pdf的包后面再做解释
import CMapReaderFactory from "vue-pdf-signature/src/CMapReaderFactory.js";
（CMapReaderFactory）解决汉字空白的问题

components: {
    pdf
},

<!-- 有查询pdf结果显示的盒子 -->
<pdf :src="pdfSrc"></pdf>    // pdfSrc为pdf包处理过后的预览链接

slowLoading() {
    var _this = this
    const toast = Toast.loading({
                duration: 0, // 持续展示 toast
                forbidClick: true,
                message: "正在生成您的权益单，请稍等...",
                className: "loading"
            });
    let tips = [
            '正在生成您的权益单，请稍等...', 
            '权益单文档生成时间较长，请耐心等待', 
             '您可以选择年度查询']
    let strlen = tips.length;
    _this.tipTimer = setInterval(() => {
        let index = Math.floor(Math.random() * strlen);
        toast.message = tips[index];
    }, 3000);
}

// _this.pdfUrl是后端返回的pdf链接
// _this.pdfSrc声明空变量对处理的过的pdf链接进行接收绑定给页面的pdf组件的src属性
 
loadPdf() {
    var _this = this;
    _this.pdfDownloadUrl = _this.pdfUrl + "?isDownload=1";
    console.log(_this.pdfDownloadUrl);
    _this.pdfSrc = pdf.createLoadingTask({
        url: _this.pdfUrl,
        // 没有生效，需要确认原因并修改
        onProgress: function (status) {
            let ratio = status.loaded / status.total;
            console.log("加载进度.." + ratio);
        },
        //cMapUrl: `https://cdn.jsdelivr.net/npm/pdfjs-dist@^2.5.207/cmaps/`,
        cMapPacked: true,
        CMapReaderFactory
    });
 
    //加载完PDF后对缓存进行清除
    for (var key in require.cache) {
        if (key.indexOf('bcmap') >= 0) {
            delete require.cache[key];
        }
    }
 
    // _this.pdfSrc = _this.loadingTask;
    // console.log(_this.pdfSrc, 'src');
    _this.pdfSrc.promise.then(pdf => {
        console.log(pdf)
        console.log("pdf 加载成功...");
        Toast.clear();
        clearInterval(_this.tipTimer);
    },
        err => {
            console.log("rejected: ", err);
            clearInterval(_this.tipTimer);
            Toast.clear();
            Toast.fail({
                message: '权益单生成失败，请重试',
                forbidClick: true,
                duration: 2,
            });
        });
},

reloadPdf() {
      this.slowLoading();
      this.loadPdf()
},
 
this.reloadPdf()

//pdf.worker.js
 
if (data.fieldType === 'Sig') {
  data.fieldValue = null;
    //注释此行代码即可
 
  //_this3.setFlags(_util.AnnotationFlag.HIDDEN);
 
}

import { CMapCompressionType } from 'pdfjs-dist-sign/es5/build/pdf.js'
 
// see https://github.com/mozilla/pdf.js/blob/628e70fbb5dea3b9066aa5c34cca70aaafef8db2/src/display/dom_utils.js#L64
 
export default function() {
 
	this.fetch = function(query) {
		 /* webpackChunkName: "noprefetch-[request]" */
		return import('./buffer-loader!pdfjs-dist-sign/cmaps/'+query.name+'.bcmap').then(function(bcmap) {
			//加载完语言文件后清除缓存
			delete require.cache[require.resolve('./buffer-loader!pdfjs-dist-sign/cmaps/'+query.name+'.bcmap')];
			return {
				cMapData: bcmap.default,
				compressionType: CMapCompressionType.BINARY,
			};
		});
	}
};