如何将字节数组转换为 javascript 中的 blob for angular？

Question

我正在以字节数组的形式从后端获取 excel 文件。我想将该字节数组转换为 blob，然后再转换为文件类型。请看一下我使用的以下代码。

this.getFile().subscribe((response)=>{
const.byteArray=new Uint8Array(atob(response.data).split('').map(char)=>char.charCodeAt(0))
this.pdfResult=new(Blob[byteArray],{type:"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"});
let file=new File([this.pdfResult],"sample.xlsx")
});

Answer 1

如果您已正确获取字节数组，此函数可能有助于正确获取类型

  function(ext) {
        if (ext != undefined) {
            return this.extToMimes(ext);
        }
        return undefined;
    }

extToMimes(ext) {
        let type = undefined;
        switch (ext) {
            case 'jpg':
            case 'png':
            case 'jpeg':
                type = 'image/jpeg'
                break;
            case 'txt':
                type = 'text/plain'
                break;
            case 'xls':
                type = 'application/vnd.ms-excel'
                break;
            case 'doc':
                type = 'application/msword'
                break;
            case 'xlsx':
                type = 'application/vnd.ms-excel'
                break;
            default:

        }
        return type;
    }


let _type = this.function(fileExtension.toLowerCase());
const blob = new Blob([byteArray], { type: _type });
let file=new File([this.pdfResult],"sample.xlsx")

如何将字节数组转换为 javascript 中的 blob for angular？

How to convert byte array to blob in javascript for angular?

javascript

entity-framework

typescript

angular