[JavaScript] 특정 영역의 레이어만 인쇄하기

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<script>     var initBody;     function beforePrint()     {         initBody = document.body.innerHTML;         document.body.innerHTML = div_page.innerHTML;     }     function afterPrint()     {         document.body.innerHTML = initBody;     }     function pageprint()     {         window.onbeforeprint = beforePrint;         window.onafterprint = afterPrint;         window.print();     } </script>   <a href="#" onclick="pageprint()"> 인쇄하기</a> <div id="div_page">여기만 인쇄</div>