blob数据格式下载excel文件

blob数据格式下载excel文件

export default async function download(fileList,userId){
    if(fileList.length===0){
        console.log('无文件数据信息')
        return
    }
    if(fileList.length===1){
        if(fileList[0].fileSize>=2000){
            await downloadBigFile(fileList[0],userId)
            return 
        }
        //请求参数 根据需求来进入入参
        const req = {
            Head:{},
            Body:{
                ceFileId:fileList[0].fileId,operatorId:fileList[0].uploadUser
            }
        }
        service({
            url:'',//接口请求地址
            method:'post',
            responseType:'blob',
            data:JSON.stringify(req)
        }).then(data=>{
            console.log('文件信息数据获取',)
            if(!data){
                console.log('文件下载失败')
                return false
            }
            if(window.navigator&&window.navigator.msSaveOrOpenBlob){
                const blob = new Blob([data])
                window.navigator.msSaveOrOpenBlob(blob,fileList[0].fileName)
            }else{
                const blob = new Blob([data],{
                    type:'application/octet-stream'
                })
            const downloadElement = document.createElement('a')
            const herf = window.URL.createObjectURL(blob)
            downloadElement.style.display = 'none'
            downloadElement.download = file.fileName
            document.body.appendChild(downloadElement)
            downloadElement.click()
            document.body.removeChild(downloadElement)
            window.URL.revokeObjectURL(herf)
            }
        }).catch(err=>{
            console.log('文件下载失败')
        })
    }else{
        for(let i =0;i<fileList.length;i++){
            if(fileList[i].fileSize>=20480){
                await downloadBigFile(fileList[i],userId)
                continue
            }
            const req = {
                Head:{},
                Body:{
                    ceFileId:fileList[0].fileId,operatorId:fileList[0].uploadUser
                }
            }
            service({
                url:'',
                method:'post',
                responseType:'blob',
                data:JSON.stringify(req)
            }).then(data=>{
                if(!data){
                    console.log('文件下载失败')
                }
                if(window.navigator&&window.navigator.msSaveOrOpenBlob){
                    const blob = new Blob([data])
                    window.navigator.msSaveOrOpenBlob(blob,fileList[0].fileName)
                }else{
                    const blob = new Blob([data],{
                        type:'application/octet-stream'
                    })
                const downloadElement = document.createElement('a')
                const herf = window.URL.createObjectURL(blob)
                downloadElement.style.display = 'none'
                downloadElement.download = file.fileName
                document.body.appendChild(downloadElement)
                downloadElement.click()
                document.body.removeChild(downloadElement)
                window.URL.revokeObjectURL(herf)
                }
            }).catch(err=>{
                console.log('文件下载失败')
            })
        }
    }    
}
function downloadBigFile(file,userId){
    var formData = new FormData
    formData.append('fileId',file.fileId)
    formData.append('userId',userId)
    service({
        method:'post',
        url:'',
        header:{
            'Access-Control-Allow-Origin':'*',
            'Content-Type':'application/json'
        },
        responseType:'blob',
        data:formData
    }).then(data=>{
        if(!data.data){
            console.log('文件下载失败')
            return false
        }
        if(window.navigator&&window.navigator.msSaveOrOpenBlob){
            const blob = new Blob([data])
            window.navigator.msSaveOrOpenBlob(blob,file.fileName)
        }else{
            const blob = new Blob([data],{
                type:'application/octet-stream'
            })
            const downloadElement = document.createElement('a')
            const herf = window.URL.createObjectURL(blob)
            downloadElement.style.display = 'none'
            downloadElement.download = file.fileName
            document.body.appendChild(downloadElement)
            downloadElement.click()
            document.body.removeChild(downloadElement)
            window.URL.revokeObjectURL(herf)
        }
    }).catch(err=>{
        console.log('文件下载失败')
    })
}