前端导出csv格式时产生中文乱码和异步A标签点击下载解决方案

$('#list_csv_export').click(function () {
            var url = $(this).attr('data-url');
            var layer = layui.layer;
            layer.msg('正在下载订单明细,请耐心等待', {icon: 6, time:1500});
            layer.load(2);
            $.get(url, function (data) {
                if (undefined == data.retCode) {
                    let a = document.createElement('a');
                    content="ufeff"+data;
                    let url = window.URL.createObjectURL(new Blob([content],{type:'text/plain,charset=utf-8'}));
                    let filename = '订单明细.csv';
                    a.href = url;
                    a.download = filename;
                    a.click();
                    window.URL.revokeObjectURL(url);
                    layer.msg('导出成功', {icon: 6, time:1500});
                    layer.closeAll('loading');
                } else {
                    layer.msg('导出失败,请刷新页面后重试', {icon: 5, time:1500});
                }
            });
        });