保存部分网页

function  DownLoad()     {         //取得id=tb的表格的HTML代码.         var   strHTML   =   tb.outerHTML;         var   winSave   =   window.open();         winSave.document.open   ("text/html","gb2312");         winSave.document.write   (strHTML);         winSave.document.execCommand   ("SaveAs",true,"table.htm");         winSave.close();     }