打印HTML页面部分区域javascript代码

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 prnhtmlprnhtml = prnhtml.substring(0, prnhtml.indexOf(eprnstr)); //从结束代码向前取html
window.document.body.innerHTML = prnhtml;
window.print();
window.document.body.innerHTML = bdhtml;
} else {
window.print();
}
}