php代码部分
<?php
$table = "<table>";
$table .= "<thead><tr><td>表头1</td><td>表头2</td><td>表头3</td></tr></thead>";
$table .= "<tbody><tr><td>内容1</td><td>内容2</td><td>内容3</td></tr></tbody>";
$table .= "</table>";
$this->assign('table',$table);
$this->display('excel');
?>html部分
<html xmlns:x="urn:schemas-microsoft-com:office:excel">
<head>
<!--[if gte mso 9]-->
<xml>
<x:ExcelWorkbook>
<x:ExcelWorksheets>
<x:ExcelWorksheet>
<x:Name>sheet1</x:Name>
<x:WorksheetOptions>
<x:Print>
<x:ValidPrinterInfo />
</x:Print>
</x:WorksheetOptions>
</x:ExcelWorksheet>
</x:ExcelWorksheets>
</x:ExcelWorkbook>
</xml>
<!--[endif]-->
</head>
<body>
<table>
{{$trs}}
</table>
</body>
</html>