vue-pdf打包后无法预览问题及修复方式

pendingOperation = pendingOperation.then(function() {
 		var loadingTask;
 		if ( isPDFDocumentLoadingTask(src) ) {

 			if ( src.destroyed ) {

 				emitEvent('error', new Error('loadingTask has been destroyed'));
 				return
 			}

 			loadingTask = src;
 		} else {

 			loadingTask = createLoadingTask(src, {
 				onPassword: function(updatePassword, reason) {

 					var reasonStr;
 					switch (reason) {
 						case PDFJS.PasswordResponses.NEED_PASSWORD:
 							reasonStr = 'NEED_PASSWORD';
 							break;
 						case PDFJS.PasswordResponses.INCORRECT_PASSWORD:
 							reasonStr = 'INCORRECT_PASSWORD';
 							break;
 					}
 					emitEvent('password', updatePassword, reasonStr);
 				},
 				onProgress: function(status) {

 					var ratio = status.loaded / status.total;
 					emitEvent('progress', Math.min(ratio, 1));
 				}
 			});
 		}
 		console.log(loadingTask)
 		return loadingTask.promise;
 	})
 	.then(function(pdf) {

 		pdfDoc = pdf;
 		emitEvent('num-pages', pdf.numPages);
 		emitEvent('loaded');
 	})
 	.catch(function(err) {
 		console.log(err)
 		clearCanvas();
 		clearAnnotations();
 		emitEvent('error', err);
 	})

xhr.open("GET", this.url);     
xhr.open("GET", this.url,true);

npx patch-package pdfjs-dist

"scripts": {
 	"postinstall": "patch-package"
}