Vue利用Blob下载原生二进制数组文件

本文实例为大家分享了Vue利用Blob下载原生二进制数组文件的具体代码,供大家参考,具体内容如下

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

};

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