异步二进制文件下载

var download_csv_using_blob = function (file_name, content) {
    var csvData = new Blob([content], { type: 'text/csv' });
    // for IE
    if (window.navigator && window.navigator.msSaveOrOpenBlob) {
        window.navigator.msSaveOrOpenBlob(csvData, file_name);
    }
    // for Non-IE (chrome, firefox etc.)
    else {
        var a = document.createElement('a');
        document.body.appendChild(a);
        a.style = 'display: none';
        var url = window.URL.createObjectURL(csvData);
        a.href =  url;
        a.download = file_name;
        a.click();
        a.remove();
        window.URL.revokeObjectURL(url);
    }
};