导出前端Table到Excel功能，如果后台去做， 的确可以忽略考虑浏览器的兼容性问题 ，但是后台需要用正则表达式进行匹配每行的数据，并且还要考虑合并单元格问题，复杂度很大 。
如果前端可以直接将table对象转换成excel通用对象的话，那么只要将table里的内容复制到excel中就能实现导出功能。以下程序就是在前端上实现下载到excel功能，不过缺陷是有浏览器的兼容性问题，需要利用ActiveXObject来开启Excel程序，以下程序只能在IE中实现。
/**
* ========================导出到Excel===================================================
*
* 功能：HTML中Table对象转换为Excel通用对象.
* 参数：tableID HTML中Table对象的ID属性值
*/
test._helper.exportToExcel = function(tableID){
var tb = new TableToExcel(tableID);
tb.setFontStyle("Courier New");
tb.setFontSize(10);
tb.setTableBorder(2);
tb.setColumnWidth(7);
tb.isLineWrap(true);
tb.getExcelFile();
};
TableToExcel = function(tableID) {
this.tableBorder = -1; //边框类型，-1没有边框 可取1/2/3/4
this.backGround = 0; //背景颜色：白色 可取调色板中的颜色编号 1/2/3/4....
this.fontColor = 1; //字体颜色：黑色
this.fontSize = 10; //字体大小
this.fontStyle = "宋体"; //字体类型
this.rowHeight = 20; //行高
this.columnWidth = -1; //列宽
this.lineWrap = true; //是否自动换行
this.textAlign = -4108; //内容对齐方式 默认为居中
this.autoFit = true; //是否自适应宽度
this.tableID = tableID;
};
TableToExcel.prototype.setTableBorder = function(excelBorder) {
this.tableBorder = excelBorder;
};
TableToExcel.prototype.setBackGround = function(excelColor) {
this.backGround = excelColor;
};
TableToExcel.prototype.setFontColor = function(excelColor) {
this.fontColor = excelColor;
};
TableToExcel.prototype.setFontSize = function(excelFontSize) {
this.fontSize = excelFontSize;
};
TableToExcel.prototype.setFontStyle = function(excelFont) {
this.fontStyle = excelFont;
};
TableToExcel.prototype.setRowHeight = function(excelRowHeight) {
this.rowHeight = excelRowHeight;
};
TableToExcel.prototype.setColumnWidth = function(excelColumnWidth) {
this.columnWidth = excelColumnWidth;
};
TableToExcel.prototype.isLineWrap = function(lineWrap) {
if (lineWrap == false || lineWrap == true) {
this.lineWrap = lineWrap;
}
};
TableToExcel.prototype.setTextAlign = function(textAlign) {
this.textAlign = textAlign;
};
TableToExcel.prototype.isAutoFit = function(autoFit) {
if (autoFit == true || autoFit == false)
this.autoFit = autoFit;
}
//文件转换主函数
TableToExcel.prototype.getExcelFile = function() {
var jXls, myWorkbook, myWorksheet, myHTMLTableCell, myExcelCell, myExcelCell2;
var myCellColSpan, myCellRowSpan;
try {
jXls = new ActiveXObject('Excel.Application');
} catch (e) {
if((!+'/v1')) //ie浏览器
alert("无法启动Excel,请使用IE浏览器进行该操作!\n\n如果您确信您的电脑中已经安装了Excel，"
+ "那么请调整IE的安全级别。\n\n具体操作：\n\n"
+ "工具 → Internet选项 → 安全 → 自定义级别 → 对没有标记为安全的ActiveX进行初始化和脚本运行 → 启用");
else
alert("请使用IE浏览器进行“导出到EXCEL”操作！"); //方便设置安全等级，限制为ie浏览器
return false;
}
//jXls.Visible = true;
myWorkbook = jXls.Workbooks.Add();
jXls.DisplayAlerts = false;
myWorkbook.Worksheets(3).Delete();
myWorkbook.Worksheets(2).Delete();
jXls.DisplayAlerts = true;
myWorksheet = myWorkbook.ActiveSheet;
var readRow = 0, readCol = 0;
var totalRow = 0, totalCol = 0;
var tabNum = 0;
//设置行高、列宽
if (this.columnWidth != -1)
myWorksheet.Columns.ColumnWidth = this.columnWidth;
else
myWorksheet.Columns.ColumnWidth = 7;
if (this.rowHeight != -1)
myWorksheet.Rows.RowHeight = this.rowHeight;
//搜索需要转换的Table对象，获取对应行、列数
var obj = document.all.tags("table");
for (x = 0; x < obj.length; x++) {
if (obj[x].id == this.tableID) {
tabNum = x;
totalRow = obj[x].rows.length;
for (i = 0; i < obj[x].rows[0].cells.length; i++) {
myHTMLTableCell = obj[x].rows(0).cells(i);
myCellColSpan = myHTMLTableCell.colSpan;
totalCol = totalCol + myCellColSpan;
}
}
}
//开始构件模拟表格
var excelTable = new Array();
for (i = 0; i <= totalRow; i++) {
excelTable[i] = new Array();
for (t = 0; t <= totalCol; t++) {
excelTable[i][t] = false;
}
}
//开始转换表格
for (z = 0; z < obj[tabNum].rows.length; z++) {
readRow = z + 1;
readCol = 0;
for (c = 0; c < obj[tabNum].rows(z).cells.length; c++) {
myHTMLTableCell = obj[tabNum].rows(z).cells(c);
myCellColSpan = myHTMLTableCell.colSpan;
myCellRowSpan = myHTMLTableCell.rowSpan;
for (y = 1; y <= totalCol; y++) {
if (excelTable[readRow][y] == false) {
readCol = y;
break;
}
}
if (myCellColSpan * myCellRowSpan > 1) {
myExcelCell = myWorksheet.Cells(readRow, readCol);
myExcelCell2 = myWorksheet.Cells(readRow
+ myCellRowSpan - 1, readCol
+ myCellColSpan - 1);
myWorksheet.Range(myExcelCell, myExcelCell2)
.Merge();
myExcelCell.HorizontalAlignment = this.textAlign;
myExcelCell.Font.Size = this.fontSize;
myExcelCell.Font.Name = this.fontStyle;
myExcelCell.wrapText = this.lineWrap;
myExcelCell.Interior.ColorIndex = this.backGround;
myExcelCell.Font.ColorIndex = this.fontColor;
if (this.tableBorder != -1) {
myWorksheet.Range(myExcelCell, myExcelCell2)
.Borders(1).Weight = this.tableBorder;
myWorksheet.Range(myExcelCell, myExcelCell2)
.Borders(2).Weight = this.tableBorder;
myWorksheet.Range(myExcelCell, myExcelCell2)
.Borders(3).Weight = this.tableBorder;
myWorksheet.Range(myExcelCell, myExcelCell2)
.Borders(4).Weight = this.tableBorder;
}
myExcelCell.Value = myHTMLTableCell.innerText;
for (row = readRow; row <= myCellRowSpan + readRow
- 1; row++) {
for (col = readCol; col <= myCellColSpan
+ readCol - 1; col++) {
excelTable[row][col] = true;
}
}
readCol = readCol + myCellColSpan;
} else {
myExcelCell = myWorksheet.Cells(readRow, readCol);
myExcelCell.Value = myHTMLTableCell.innerText;
myExcelCell.HorizontalAlignment = this.textAlign;
myExcelCell.Font.Size = this.fontSize;
myExcelCell.Font.Name = this.fontStyle;
myExcelCell.wrapText = this.lineWrap;
myExcelCell.Interior.ColorIndex = this.backGround;
myExcelCell.Font.ColorIndex = this.fontColor;
if (this.tableBorder != -1) {
myExcelCell.Borders(1).Weight = this.tableBorder;
myExcelCell.Borders(2).Weight = this.tableBorder;
myExcelCell.Borders(3).Weight = this.tableBorder;
myExcelCell.Borders(4).Weight = this.tableBorder;
}
excelTable[readRow][readCol] = true;
readCol = readCol + 1;
}
}
}
if (this.autoFit == true)
myWorksheet.Columns.AutoFit;
jXls.UserControl = true;
jXls.Visible = true;
jXls = null;
myWorkbook = null;
myWorksheet = null;
};
/**
* ===================导出到Excel 结束===========================================
* */