<input type="button" onclick="javascript:printit()"></input>//打印整个html网页.
//打印局部html网页 extjs中的例子
bdhtml = window.document.body.innerHTML;
startprint = ("<div>");
endprint = ("</div>");
printhtml = bdhtml.substr(bdhtml.indexOf(startprint) );
printhtml = printhtml.substr(0, printhtml.indexOf(endprint));
window.document.write(\'<html>\');
window.document.write(\'<head>\');
window.document.write(\'<title>打印列表</title>\');
window.document.write(\'</head>\');
window.document.write(\'<body><from>\');
window.document.write(printhtml);
window.document.write(\'<from></body>\');
window.document.write(\'</html>\');
window.print();
window.location.reload();//加载页面