js导出Excel

<mce:script language=javascript><!--

function preview() {
window.clipboardData.setData("Text",document.all('table1').outerHTML);
try
{
var ExApp = new ActiveXObject("Excel.Application")
var ExWBk = ExApp.workbooks.add()
var ExWSh = ExWBk.worksheets(1)
ExApp.DisplayAlerts = false
ExApp.visible = true
}
catch(e)
{
alert("您的电脑没有安装Microsoft Excel软件！")
return false
}
ExWBk.worksheets(1).Paste;
}
// --></mce:script>