如何在前端展示后端返回的pdf Base64格式字符串

// fileBase64 就是后端返回的 pdf Base64格式字符串getPdfDocument(fileBase64) {let fileBlob = this.base64ToBlobsdf(fileBase64,'application/pdf');let basePdfUrl = window.URL.createObjectURL(fileBlob);sessionStorage.setItem('basePdfUrl', basePdfUrl);location.href = "lookPdf.html";let newWindow = window.open("");newWindow.document.write("<iframe width='100%' height='100%' src='"+basePdfUrl+"'></iframe>");}})},base64ToBlobsdf(fileBase64,fileType){let raw = window.atob(fileBase64);let rawLength = raw.length;let uint8Array = new Uint8Array(rawLength);while (rawLength--){uint8Array[rawLength] = raw.charCodeAt(rawLength);}return new Blob([uint8Array],{type: fileType});},