打印网页指定部分

function preview()

{

//pagesetup_null();

bdhtml=window.document.body.innerHTML;

sprnstr="";

 eprnstr="";

 prnhtml=bdhtml.substr(bdhtml.indexOf(sprnstr)+17);

 prnhtml=prnhtml.substring(0,prnhtml.indexOf(eprnstr)); window.document.body.innerHTML=prnhtml;

window.print();

}