Angularjs js给出了IE 11中未定义或空引用的错误

我的angular模块中有pdf.js和pdf.combined.js依赖项，它在chrome浏览器中运行良好，但在IE 11中生成空引用错误

pdf.combined.js

  if (!PDFJS.workerSrc && typeof document !== 'undefined') {
  // workerSrc is not set -- using last script url 
   to define default location
 PDFJS.workerSrc = (function () {
 'use strict';
  var pdfJsSrc = document.currentScript.src;
  return pdfJsSrc && pdfJsSrc.replace(/\.js$/i, '.worker.js');
 })();

 SCRIPT5007: Unable to get property 'src' of undefined or null reference

for line of code:
 var pdfJsSrc = document.currentScript.src;

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使用web/compatibility.jsThank，这使它工作。使用web/compatibility.jsThank，这使它工作。