blob 数据下载

zip

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exportExcel({ taskId: '1-ef4a-1', tableName: '1result', exportName: '指标' }).then(res => {         const content = res         const blob = new Blob([content])         const fileName = '预警指标结果.zip'         let data = res         let that = this         let fileReader = new FileReader()         fileReader.onload = function (e) {           try {             let jsonData = JSON.parse(e.target.result) // 说明是普通对象数据，后台转换失败             if (jsonData.code != 200) {               that.loading = false               that.$message.warning(jsonData.trace)             }           } catch (err) {             // 解析成对象失败，说明是正常的文件流             // that.downloadFile(res, map)             that.loading = false             if ('download' in document.createElement('a')) {               // 非IE下载               const elink = document.createElement('a')               elink.download = fileName               elink.style.display = 'none'               elink.href = URL.createObjectURL(blob)               document.body.appendChild(elink)               elink.click()               URL.revokeObjectURL(elink.href) // 释放URL 对象               document.body.removeChild(elink)             } else {               // IE10+下载               navigator.msSaveBlob(blob, fileName)             }           }         }         fileReader.readAsText(data)       }).catch(e => {         console.log('e=', e)       })