JavaScript指定打印 div 层

<!-- js function --> function printdiv(printpage)

{var headstr = "<html><head><title></title></head><body>";

var footstr = "</body>";

var newstr = document.all.item(printpage).innerHTML;

var oldstr = document.body.innerHTML;

document.body.innerHTML = headstr+newstr+footstr;

window.print();

document.body.innerHTML = oldstr;return false;}

//网页部分 <input name="b_print" type="button" class="ipt"   onClick="printdiv('div_print');" value=" 打印测试 ">

 //打印的内容 <div id="div_print">

要打印内容 </div>

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