[工程架构思考-请求] download-csv-方案-data-schema-VS-Blob

1. Stack Overflow max-data-uri-size-in-javascript
2. data_URIs与base64???
3. 利用Blob和data schema 前端下载csv, 来自iview

 _getDownloadUrl (text) {
        const BOM = '\uFEFF';
        // Add BOM to text for open in excel correctly
        if (window.Blob && window.URL && window.URL.createObjectURL && !has('Safari')) {
            const csvData = new Blob([BOM + text], { type: 'text/csv' });
            return URL.createObjectURL(csvData);
        } else {
            return 'data:attachment/csv;charset=utf-8,' + BOM + encodeURIComponent(text);
        }
    },

    download (
        if (has('ie') && has('ie') < 10) {
            // has module unable identify ie11 and Edge
            const oWin = window.top.open('about:blank', '_blank');
            oWin.document.charset = 'utf-8';
            oWin.document.write(text);
            oWin.document.close();
            oWin.document.execCommand('SaveAs',
            oWin.close();
        } else if (has('ie') === 10 || this._isIE11() || this._isEdge()) {
            const BOM = '\uFEFF';
            const csvData = new Blob([BOM + text], { type: 'text/csv' });
            navigator.msSaveBlob(csvData,
        } else {
            const link = document.createElement('a');
            link.download =
            link.href = this._getDownloadUrl(text);
            link.target = '_blank';
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
        }
    }