js读取excel有部分内容显示不出来

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>无标题文档</title>

</head>



<body>





<script language="javascript" type="text/javascript">

function importXLS(fileName)

{

    objCon = new ActiveXObject("ADODB.Connection");

    objCon.Provider = "Microsoft.Jet.OLEDB.4.0";

    objCon.ConnectionString = "Data Source=" + fileName + ";Extended Properties=Excel 8.0;";

    objCon.CursorLocation = 1;

    objCon.Open;

    var strQuery;

    //Get the SheetName

    var strSheetName = "Sheet1$";

    var rsTemp =  new ActiveXObject("ADODB.Recordset");

    rsTemp = objCon.OpenSchema(20);

    if(!rsTemp.EOF)

    strSheetName = rsTemp.Fields("Table_Name").Value;

    rsTemp = null

    rsExcel =  new ActiveXObject("ADODB.Recordset");

    strQuery = "SELECT * FROM [" + strSheetName + "]";

    rsExcel.ActiveConnection = objCon;

    rsExcel.Open(strQuery);

    var str="";

    while(!rsExcel.EOF)

    {

     var i=0

     while(i<rsExcel.Fields.Count)

     {str=str+rsExcel.Fields(i).value+" ";

      i=i+1;

     }

     rsExcel.MoveNext;

    }

    // Close the connection and dispose the file

    objCon.Close;

    objCon =null;

    rsExcel = null;

    alert(str);    

}

</script>



<input type="file" id="f" />

<input type="button" id="b" value="import" onclick="if(f.value=='')alert('请选择xls文件');else importXLS(f.value)" />



</body>

</html>

a.xls的内容如下


读取a.xls后如下图：


为什么没有读第一行的7和8，还有字母“d”和中文“来啦”都读不出来呢？