在服务端推送过来的二进制数组(JSON格式），在前端要处理成JS原生数组以后才能做成Blob，有两个地方要注意（详细注释），代码如下：
Vue.prototype.$downloadFile = (filename, data) => { if (!data) return; let arr8 = Uint8Array.from(data); //！！！注意1：应根据数据的类型选择适当的JS原生数组类型进行转换，也就是说服务端推送的byte型数组还是int型数组等。 //定义文件内容，类型必须为Blob 否则createObjectURL会报错 let blob = null; let type = 'application/octet-binary'; if (typeof (window.Blob) == "function") { blob = new Blob([arr8], {//！！！注意2：数组两边必须加上[] type: type }); } else { let BlobBuilder = window.BlobBuilder || window.MozBlobBuilder || window.WebKitBlobBuilder || window.MSBlobBuilder; let bb = new BlobBuilder(); bb.append([arr8]); blob = bb.getBlob(type); } let URL = window.URL || window.webkitURL; let bloburl = URL.createObjectURL(blob); let anchor = document.createElement("a"); if ('download' in anchor) { anchor.style.visibility = "hidden"; anchor.href = bloburl; anchor.download = filename; document.body.appendChild(anchor); let evt = document.createEvent("MouseEvents"); evt.initEvent("click", true, true); anchor.dispatchEvent(evt); document.body.removeChild(anchor); } else if (navigator.msSaveBlob) { navigator.msSaveBlob(blob, filename); } else { location.href = bloburl; } //移除链接释放资源 };