http://www.iteye.com/topic/1114154?

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function doPrint() {
??? bdhtml = window.document.body.innerHTML;
??? sprnstr = "<!--startprint-->";
??? eprnstr = "<!--endprint-->";
??? prnhtml = bdhtml.substr(bdhtml.indexOf(sprnstr) + 17);
??? prnhtml = prnhtml.substring(0, prnhtml.indexOf(eprnstr));
??? window.document.body.innerHTML = prnhtml;
??? window.print();
}

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<boby>

?<!--startprint-->

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要打印的内容

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<!--endprint-->

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<boby>