导出EXCEL一般是用PHP做，但是项目中，有时候PHP后端工程师返回的数据不是我们想要的，作为前端开发工程师，把对应的数据编号转换为文字后，展示给用户，但是，需求要把数据同时导出一份EXCEl。无奈之下，我只能用js导出table中的数据了。

   导出EXCEl一般是自己人用的，所以用js导出，因为js导出EXCEL一般情况下兼容性不是很好，很多只是兼容IE浏览器，还要设置在工具栏中进行设置才能导出，因为会相对比较烦。下面介绍几种方法：

一、js导出EXCEl带单元格合并【已验证，比较好用】

// JavaScript Document
//调用方法
//   var test=new PageToExcel("data",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
//




function PageToExcel(TableID,FirstRow,LastRowColor,SaveAsName){
this.lastRowColor=LastRowColor==""?0:LastRowColor;
var today=new Date();
this.saveAsName=(SaveAsName==""?today.getYear()+"年"+(today.getMonth()+1)+"月"+today.getDate()+"日.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();
   }
}

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
      }
     }
//try{
      //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 = http://www.mamicode.com/this.ChangeElementToLabel(this.table.rows(i).cells(j));>
注意：要改IE浏览器安全设置





二、js导出table中的EXCEL.该方法只能在IE内核下运行，相比其他方法的好处是，不
用再设置什么属性或者安装什么插件了，思路如下：
function getXlsFromTbl(inTblId, inWindow) {
     try {
         var allStr = "";
         var curStr = "";
         //alert("getXlsFromTbl");
         if (inTblId != null && inTblId != "" && inTblId != "null") {
             curStr = getTblData(inTblId, inWindow);
         }
         if (curStr != null) {
             allStr += curStr;
        }
        else {
            alert("你要导出的表不存在！");
            return;
        }
        var fileName = getExcelFileName();
        doFileExport(fileName, allStr);
    }
    catch(e) {
        alert("导出发生异常:" + e.name + "->" + e.description + "!");
    }
}
function getTblData(inTbl, inWindow) {
    var rows = 0;
    //alert("getTblData is " + inWindow);
    var tblDocument = document;
    if (!!inWindow && inWindow != "") {
        if (!document.all(inWindow)) {
            return null;
        }
        else {
            tblDocument = eval(inWindow).document;
        }
    }
    var curTbl = tblDocument.getElementById(inTbl);
    var outStr = "";
    if (curTbl != null) {
        for (var j = 0; j < curTbl.rows.length; j++) {
            for (var i = 0; i < curTbl.rows[j].cells.length; i++) {
                if (i == 0 && rows > 0) {
                    outStr += " \t";
                    rows -= 1;
                }
                outStr += curTbl.rows[j].cells[i].innerText + "\t";
                if (curTbl.rows[j].cells[i].colSpan > 1) {
                    for (var k = 0; k < curTbl.rows[j].cells[i].colSpan - 1; k++) {
                        outStr += " \t";
                    }
                }
                if (i == 0) {
                    if (rows == 0 && curTbl.rows[j].cells[i].rowSpan > 1) {
                        rows = curTbl.rows[j].cells[i].rowSpan - 1;
                    }
                }
            }
            outStr += "\r\n";
        }
    }
    else {
        outStr = null;
        alert(inTbl + "不存在!");
    }
    return outStr;
}
function getExcelFileName() {
    var d = new Date();
    var curYear = d.getYear();
    var curMonth = "" + (d.getMonth() + 1);
    var curDate = "" + d.getDate();
    var curHour = "" + d.getHours();
    var curMinute = "" + d.getMinutes();
    var curSecond = "" + d.getSeconds();
    if (curMonth.length == 1) {
        curMonth = "0" + curMonth;
    }
    if (curDate.length == 1) {
        curDate = "0" + curDate;
    }
    if (curHour.length == 1) {
        curHour = "0" + curHour;
    }
    if (curMinute.length == 1) {
        curMinute = "0" + curMinute;
    }
    if (curSecond.length == 1) {
        curSecond = "0" + curSecond;
    }
    var fileName = "91zaojia" + "_" + curYear + curMonth + curDate + "_"
            + curHour + curMinute + curSecond + ".xls";
    return fileName;
}
function doFileExport(inName, inStr) {
    var xlsWin = null;
    if (!!document.all("glbHideFrm")) {
        xlsWin = glbHideFrm;
    }
    else {
        var width = 6;
        var height = 4;
        var openPara = "left=" + (window.screen.width / 2 - width / 2)
                + ",top=" + (window.screen.height / 2 - height / 2)
                + ",scrollbars=no,width=" + width + ",height=" + height;
        xlsWin = window.open("", "_blank", openPara);
    }
    xlsWin.document.write(inStr);
    xlsWin.document.close();
    xlsWin.document.execCommand('Saveas', true, inName);
    xlsWin.close();
}

改代码已经验证，可以使用。调用很简单，直接用就可以

onclick="getXlsFromTbl(‘functionclickExcel‘,null);就可以了！