js 导出excel格式文件 含合并列 合并行

function PageToExcel(TableID,FirstRow,LastRowColor,SaveAsName){
this.lastRowColor=LastRowColor==""?0:LastRowColor;
var today=new Date();
this.saveAsName=(SaveAsName==""?today.getYear()+""+(today.getMonth()+1) + today.getDate() + today.getHours() + today.getMinutes() + today.getSeconds()  + ".xls":SaveAsName);
this.tableId=TableID;
this.table=document.getElementById(this.tableId);//导出的table 对象
this.rows=this.table.rows.length;//导出的table总行数
this.colSumCols=this.table.rows(0).cells.length;//第一行总列数
this.fromrow=FirstRow;
this.beginCol=0; //起始列数
this.cols=this.colSumCols;
this.oXL=null;
this.oWB=null;
this.oSheet=null;
this.rowSpans=1; //行合并
this.colSpans=1; //列合并
this.colsName={0:"A",1:"B", 2:"C", 3:"D", 4:"E", 5:"F", 6:"G", 7:"H", 8:"I",9:"J", 10:"K", 11:"L", 12:"M", 13:"N", 14:"O", 15:"P", 16:"Q", 16:"R" ,18:"S", 19:"T", 20:"U", 21:"V", 22:"W", 23:"X", 24:"Y", 25:"Z"};

}
PageToExcel.prototype.DeleteExcelCols=function(NotShowColList){//数组NotShowColList
    //this.notShowColList=NotShowColList;//不显示列集合,1,2,3,1
    //删除excel中的列
   var m=0;
   for(var i=0;i<NotShowColList.length;i++){
   if(i>0){
m++;
}
var temp=NotShowColList[i]- m;
var index=this.colsName[temp];
this.oSheet.Columns(index).Delete;//删除
   }
   m=0;
}
PageToExcel.prototype.CreateExcel=function(ExcelVisible){
   try{
   this.oXL = new ActiveXObject("Excel.Application"); //创建应该对象
   this.oXL.Visible = ExcelVisible;
   this.oWB = this.oXL.Workbooks.Add();//新建一个Excel工作簿
   this.oSheet = this.oWB.ActiveSheet;//指定要写入内容的工作表为活动工作表
   //不显示网格线
   //this.oXL.ActiveWindow.DisplayGridlines=false;
   }catch(e){
alert("请确认安装了非绿色版本的excel！"+e.description);
CloseExcel();
   }
}
//关闭excel
PageToExcel.prototype.CloseExcel=function(){
    this.oXL.DisplayAlerts = false;  
this.oXL.Quit();  
this.oXL = null;  
this.oWB=null;  
this.oSheet=null;
}

PageToExcel.prototype.ChangeElementToLabel=function (ElementObj){

   var GetText="";
   try{
   var childres=ElementObj.childNodes;
 
   }catch(e){ return GetText}
   if(childres.length<=0) return GetText;
   for(var i=0;i<childres.length;i++){
   try{if(childres[i].style.display=="none"||childres[i].type.toLowerCase()=="hidden"){continue;}}
   catch(e){}
   
     try{
      switch (childres[i].nodeName.toLowerCase()){
        case "#text" :
         GetText +=childres[i].nodeValue ;
         break;
        case "br" :
         GetText +="\n";
         break;
        case "img" :
         GetText +="";
         break;
        case "select" :
         GetText +=childres[i].options[childres[i].selectedIndex].innerText ;
         break;
        case "input" :
         if(childres[i].type.toLowerCase()=="submit"||childres[i].type.toLowerCase()=="button"){
          GetText +="";
         }else if(childres[i].type.toLowerCase()=="textarea"){
          GetText +=childres[i].innerText;
         }else{
          GetText +=childres[i].value;
         }
         break;
        default :
         GetText += this.ChangeElementToLabel(childres[i]);
         break;
      }
    
     }catch(e){}
   }
   return GetText;
}

PageToExcel.prototype.SaveAs=function (){
   //保存
   try{
this.oXL.Visible =true;
var fname = this.oXL.Application.GetSaveAsFilename(this.saveAsName, "Excel Spreadsheets (*.xls), *.xls");
if(fname){
this.oWB.SaveAs(fname);
this.oXL.Visible =false;
}
   }catch(e){};
}
PageToExcel.prototype.Exec=function()
{
 
   //寻找列数，考虑到第一行可能存在
   for (var i=0; i<this.colSumCols;i++) {
    var tmpcolspan = this.table.rows(0).cells(i).colSpan;
    if ( tmpcolspan>1 ) {
     this.cols += tmpcolspan-1;
    }
   }
 
   //定义2维容器数据，1：行；2：列；值（0 可以填充，1 已被填充）
   var container=new Array(this.rows);
   for (var i=0;i<this.rows;i++) {
    container[i]=new Array(this.cols);
    for (j=0;j<this.cols;j++) {
     container[i][j]=0;
    }
   }
 
   //将所有单元置为文本，避免非数字列被自动变成科学计数法和丢失前缀的0
   this.oSheet.Range(this.oSheet.Cells(this.fromrow+1,1), this.oSheet.Cells(this.fromrow+this.rows,this.cols)).NumberFormat = "@";
   // 循环行
   for (i=0;i<this.rows;i++){
    //循环列
    for (j=0;j<this.cols;j++){
     //寻找开始列
     for (k=j;k<this.cols;k++){
      if (container[i][k]==0) {
       this.beginCol=k;
       k=this.cols; //退出循环
      }
     }

      //赋值
      //此处相应跟改 根据 标签的类型，替换相关参数
      this.oSheet.Cells(i+1+this.fromrow,this.beginCol+1).value = this.ChangeElementToLabel(this.table.rows(i).cells(j));
      //计算合并列
      try{
     this.colSpans = this.table.rows(i).cells(j).colSpan;
      }catch(e){
     this.colSpans=0  
     }
     if (this.colSpans>1) {
      //合并
      this.oSheet.Range(this.oSheet.Cells(i+1+this.fromrow,this.beginCol+1),this.oSheet.Cells(i+1+this.fromrow,this.beginCol+this.colSpans)).Merge();
     }
     //将当前table位置填写到对应的容器中
     for (k=0; k<this.colSpans;k++) {
      container[i][this.beginCol+k]= 1;
     }
     // 计算合并行
   
     try{
      this.rowSpans = this.table.rows(i).cells(j).rowSpan;
       }catch(e){
       this.rowSpans = 0;
     }
   
     if (this.rowSpans>1) { //行合并
      this.oSheet.Range(this.oSheet.Cells(i+1+this.fromrow,this.beginCol+1),this.oSheet.Cells(i+this.rowSpans+this.fromrow,this.beginCol+this.colSpans)).Merge();
      //将当前table位置填写到对应的容器中
      for (k=1; k<this.rowSpans;k++) { //由于第0行已经被colSpans对应的代码填充了，故这里从第1行开始
       for (l=0;l<this.colSpans;l++) {
        container[i+k][this.beginCol+l]=1;
       }
      }
     }
     //如果开始列＋合并列已经等于列数了，故不需要再循环html table
     if (this.beginCol+this.colSpans>=this.cols) j=this.cols;
  
    }
    if(i==0)
    {
     //标题栏
     this.oSheet.Range(this.oSheet.Cells(1,1), this.oSheet.Cells(1,1)).Font.Size=20;
     this.oSheet.Range(this.oSheet.Cells(1,1), this.oSheet.Cells(1,1)).Font.Bold = true;
     this.oSheet.Range(this.oSheet.Cells(1,1), this.oSheet.Cells(1,1)).HorizontalAlignment = -4108; //居中
     this.oSheet.Range(this.oSheet.Cells(1,1), this.oSheet.Cells(1,1)).Rows.RowHeight = 40;
    }
     //自动调整行高
   }
 
   //最后一行是否空色
   try{
    this.oSheet.Range(this.oSheet.Cells(this.rows,1), this.oSheet.Cells(this.rows,1)).Font.Color=this.lastRowColor;
   }catch(e){}

   this.oSheet.Range(this.oSheet.Cells(this.fromrow+2,1), this.oSheet.Cells(this.fromrow+this.rows,this.cols)).Rows.RowHeight=20;
   this.oSheet.Range(this.oSheet.Cells(this.fromrow+2,1), this.oSheet.Cells(this.fromrow+this.rows,this.cols)).Font.Size=10;
   //自动换行
   this.oSheet.Range(this.oSheet.Cells(this.fromrow+2,1), this.oSheet.Cells(this.fromrow+this.rows,this.cols)).WrapText = true;
   //自动调整列宽
   this.oSheet.Range(this.oSheet.Cells(this.fromrow+1,1), this.oSheet.Cells(this.fromrow+this.rows,this.cols)).Columns.AutoFit();
   //点虚线
   //this.oSheet.Range(this.oSheet.Cells(this.fromrow+1,1), this.oSheet.Cells(this.fromrow+this.rows,this.cols)).Borders.LineStyle = -4118;
 
   return this.rows;
}

function test(tabId){
// JavaScript Document
//调用方法
var test=new PageToExcel(tabId,0,255,"测试.xls");//table id , 第几行开始，最后一行颜色 ，保存的文件名
test.CreateExcel(false);
test.Exec();
test.SaveAs();
test.CloseExcel();
//LastRowColor 0黑色 255红色
}