js 打印jsp

function preview(oper)
{
if (oper < 10){
bdhtml=window.document.body.innerHTML;//获取当前页的html代码
sprnstr="<!--startprint"+oper+"-->";//设置打印开始区域
eprnstr="<!--endprint"+oper+"-->";//设置打印结束区域
prnhtml=bdhtml.substring(bdhtml.indexOf(sprnstr)+18); //从开始代码向后取html

prnhtml=prnhtml.substring(0,prnhtml.indexOf(eprnstr));//从结束代码向前取html

prnhtml=prnhtml+"<link href=\"<%=request.getContextPath()%>/css/table.css\" rel=\"stylesheet\" type=\"text/css\">"

window.document.body.innerHTML=prnhtml;
window.print();
window.document.body.innerHTML=bdhtml;


} else{
window.print();
}

}


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    <input type="button" value="打印" onClick="preview(1);"/>