1 function preview(oper) {
 2         if (oper < 10) {
 3             bdhtml = window.document.body.innerHTML; //获取当前页的html代码  
 4             sprnstr = "<!--startprint" + oper + "-->"; //设置打印开始区域  
 5             eprnstr = "<!--endprint" + oper + "-->"; //设置打印结束区域  
 6             prnhtml = bdhtml.substring(bdhtml.indexOf(sprnstr) + 18); //从开始代码向后取html  
 7 
 8             prnhtmlprnhtml = prnhtml.substring(0, prnhtml.indexOf(eprnstr)); //从结束代码向前取html  
 9             window.document.body.innerHTML = prnhtml;
10             window.print();
11             window.document.body.innerHTML = bdhtml;
12         } else {
13             window.print();
14         }
15     }