前端导出文件换行

if (Yonlink.Export == true) {
                    $("#exportPoint").show();
                    $("#exportPoint").unbind().click(function () {
                        var _txt = "";
                        var pointIndex = [];
                        if (queryResult) {
                            for (var n = 0; n < queryResult.length; n++) {
                                pointStr = queryResult[n].geometry.rings[0];
                                pointIndex[n] = pointStr.length;
                                var indexNum = 0;
                                for (let k = 0; k < pointIndex.length - 1; k++) {
                                    indexNum += pointIndex[k];
                                }
                                for (var m = 0; m < pointStr.length; m++) {
                                    var xStr = pointStr[m][0].toFixed(4);
                                    var yStr = pointStr[m][1].toFixed(4);
                                    if (n > 1) {
                                        _txt += indexNum + m + 1 + "," + "0," + yStr + "," + xStr + ",0";
                                        _txt += "<br>";
                                    } else if (n == 1) {
                                        _txt += pointIndex[0] + m + 1 + "," + "0," + yStr + "," + xStr + ",0";
                                        _txt += "<br>";
                                    } else {
                                        _txt += m + 1 + "," + "0," + yStr + "," + xStr + ",0";
                                        _txt += "<br>";
                                    }
                                }
                            }
                            var isIE = !!window.ActiveXObject || "ActiveXObject" in window;
                            if (isIE) {
                                var strHTML = _txt
                                var winSave = window.open();
                                winSave.document.open("text", "utf-8");
                                winSave.document.write(strHTML);
                                winSave.document.execCommand("SaveAs", true, "coordinate.txt");
                                winSave.close();
                            } else {
                                var elHtml = _txt;
                                var mimeType = 'text/plain';
                                $('#createInvote').attr('href', 'data:' + mimeType + ';charset=utf-8,' + encodeURIComponent(elHtml));
                                document.getElementById('createInvote').click();
                            }
                        }
                    })
                }