text: /** excel导入导出工具类 **/
  var wb;//读取完成的数据
  var rABS = false; //是否将文件读取为二进制字符串
  var jsonObj;
  var head="";
  /*
   json字段说明：
   json = {"姓名": gradeData[i].s_StudentName,
           "学号": gradeData[i].s_xgh,
           "科目": gradeData[i].courseName,
           "总分": gradeData[i].s_totalScore,
           "成绩": gradeData[i].s_Score,
           "班级": gradeData[i].className,
           "考试场次": gradeData[i].infoName
   };
   **/
  
  /***
   * 1、excel导入
   * @param obj 传入的文件对象
   */
  function importf(obj) {
      if(!obj.files) {
      	jsonObj = new Array();
          return;
      }
      var f = obj.files[0];
      var reader = new FileReader();
      reader.onload = function(e) {
          var data = e.target.result;
          if(rABS) {
              wb = XLSX.read(btoa(fixdata(data)), {//手动转化
                  type: 'base64'
              });
          } else {
              wb = XLSX.read(data, {
                  type: 'binary'
              });
          }
          //wb.SheetNames[0]是获取Sheets中第一个Sheet的名字
          //wb.Sheets[Sheet名]获取第一个Sheet的数据
          //document.getElementById("demo").innerHTML= JSON.stringify( XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]) );
          var ss = JSON.stringify( XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]));
          var data = eval('(' + ss + ')');
          jsonObj = new Array();
          for(var i = 0; i < data.length;i++ ){
              jsonObj[i] = data[i];
          }
      };
      if(rABS) {
          reader.readAsArrayBuffer(f);
      } else {
          reader.readAsBinaryString(f);
      }
  }
  
  /***
   * 2、文件流转BinaryString
   * @param data
   * @returns {string}
   */
  function fixdata(data) {
      var o = "",
          l = 0,
          w = 10240;
      for(; l < data.byteLength / w; ++l) o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w, l * w + w)));
      o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w)));
      return o;
  }
  
  /***
   * 3、导出excel
   * @param json json串
   * @param id  html标签id
   * @param type 文件类型
   */
  var tmpDown; //导出的二进制对象
  function downloadExl(json,id ,flag,type) {
      var tmpdata = json[0];
      json.unshift({});
      var keyMap = []; //获取keys
      for (var k in tmpdata) {
          keyMap.push(k);
          json[0][k] = k;
      }
      var tmpdata = [];//用来保存转换好的json
      json.map((v,i) => keyMap.map((k, j) => Object.assign({}, {
          v: v[k],
          position: (j > 25 ? getCharCol(j) : String.fromCharCode(65 + j)) + (i + 1)
      }))).reduce((prev, next) => prev.concat(next)).forEach((v, i) => tmpdata[v.position] = {
          v: v.v
      });
      var outputPos = Object.keys(tmpdata); //设置区域,比如表格从A1到D10
      var tmpWB = {
          SheetNames: ['mySheet'], //保存的表标题
          Sheets: {
              'mySheet': Object.assign({},
                  tmpdata, //内容
                  {
                      '!ref': outputPos[0] + ':' + outputPos[outputPos.length - 1] //设置填充区域
                  })
          }
      };
      tmpDown = new Blob([s2ab(XLSX.write(tmpWB,
          {bookType: (type == undefined ? 'xlsx':'xls'),bookSST: false, type: 'binary'}
      ))], {
          type: ""
      }); //创建二进制对象写入转换好的字节流
      var href = URL.createObjectURL(tmpDown); //创建对象超链接
      if(flag){
      	document.getElementById(id).href = href; //绑定a标签
  	  	document.getElementById(id).click(); //模拟点击实现下载
      }else{
      	document.getElementById(id).href = href; //绑定a标签
      }
      setTimeout(function() { //延时释放
          URL.revokeObjectURL(tmpDown); //用URL.revokeObjectURL()来释放这个object URL
      }, 100);
  }
  
  /***
   * 4、导出excel文件
   * @param json 字符串
   * @param type
   */
  function downloadExl_onlyJson(json, type) {
      var tmpdata = json[0];
      json.unshift({});
      var keyMap = []; //获取keys
      for (var k in tmpdata) {
          keyMap.push(k);
          json[0][k] = k;
      }
      var tmpdata = [];//用来保存转换好的json
      json.map((v, i) => keyMap.map((k, j) => Object.assign({}, {
          v: v[k],
          position: (j > 25 ? getCharCol(j) : String.fromCharCode(65 + j)) + (i + 1)
      }))).reduce((prev, next) => prev.concat(next)).forEach((v, i) => tmpdata[v.position] = {
          v: v.v
      });
      var outputPos = Object.keys(tmpdata); //设置区域,比如表格从A1到D10
      var tmpWB = {
          SheetNames: ['mySheet'], //保存的表标题
          Sheets: {
              'mySheet': Object.assign({},
                  tmpdata, //内容
                  {
                      '!ref': outputPos[0] + ':' + outputPos[outputPos.length - 1] //设置填充区域
                  })
          }
      };
  
      tmpDown = new Blob([s2ab(XLSX.write(tmpWB,
          {bookType: (type == undefined ? 'xlsx':type),bookSST: false, type: 'binary'}//这里的数据是用来定义导出的格式类型
      ))], {
          type: ""
      }); //创建二进制对象写入转换好的字节流
      var href = URL.createObjectURL(tmpDown); //创建对象超链接
      document.getElementById("hf").href = href; //绑定a标签
      document.getElementById("hf").click(); //模拟点击实现下载
      setTimeout(function() { //延时释放
          URL.revokeObjectURL(tmpDown); //用URL.revokeObjectURL()来释放这个object URL
      }, 100);
  }
  
  function s2ab(s) { //字符串转字符流
      var buf = new ArrayBuffer(s.length);
      var view = new Uint8Array(buf);
      for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
      return buf;
  }
  // 将指定的自然数转换为26进制表示。映射关系：[0-25] -> [A-Z]。
  function getCharCol(n) {
      let temCol = '',
          s = '',
          m = 0
      while (n > 0) {
          m = n % 26 + 1
          s = String.fromCharCode(m + 64) + s
          n = (n - m) / 26
      }
      return s
  }
  
  function importGrade(obj) {
  	var arrays=["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];
      if(!obj.files) {
      	jsonObj = new Array();
          return;
      }
      var f = obj.files[0];
      var reader = new FileReader();
      reader.onload = function(e) {
          var data = e.target.result;
          if(rABS) {
              wb = XLSX.read(btoa(fixdata(data)), {//手动转化
                  type: 'base64'
              });
          } else {
              wb = XLSX.read(data, {
                  type: 'binary'
              });
          }
          //wb.SheetNames[0]是获取Sheets中第一个Sheet的名字
          //wb.Sheets[Sheet名]获取第一个Sheet的数据
          //document.getElementById("demo").innerHTML= JSON.stringify( XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]) );
          debugger;
          persons = [];
          if (wb.Sheets.hasOwnProperty(wb.SheetNames[0])) {
              var fromTo = wb.Sheets[wb.SheetNames[0]]['!ref'];
              console.log(fromTo);
              var persons = persons.concat(XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]));
              // break; // 如果只取第一张表，就取消注释这行
          }
          var mi=wb.SheetNames[0];
          var ui=fromTo[3];
          
          
          for(var i=0;i<arrays.length;i++){
          	if(i==0){
          		head+= wb.Sheets[mi][arrays[i]+'1'].v;
          	}else{
          		head+= ","+wb.Sheets[mi][arrays[i]+'1'].v;
          	}
          	if(arrays[i]==ui){
          		break;
          	}
          }
          
          var ss = JSON.stringify( XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]));
          var data = eval('(' + ss + ')');
          jsonObj = new Array();
          for(var i = 0; i < data.length;i++ ){
              jsonObj[i] = data[i];
          }
      };
      if(rABS) {
          reader.readAsArrayBuffer(f);
      } else {
          reader.readAsBinaryString(f);
      }
  }
  